Mercury 4.3 TKS Maintance Manual

4.3 TKS Models
(

Non-ECT

OPERATION &

MAINTENANCE

MANUAL

)

Welcome

You have selected one of the finest marine power packages available. It incorporates numerous design features to
ensure operating ease and durability.

With proper care and maintenance, you will enjoy using this product for many boating seasons. To ensure maximum
performance and carefree use, we ask that you thoroughly read this manual.

The Operation and Maintenance Manual contains specific instructions for using and maintaining your product. We
suggest that this manual remain with the product for ready reference whenever you are on the water.

Thank you for purchasing one of our products. We sincerely hope your boating will be pleasant!
Mercury Marine, Fond du Lac, Wisconsin, U.S.A.

Name / function:

John Pfeifer, President,
Mercury Marine

Read This Manual Thoroughly

IMPORTANT: If you do not understand any portion of this manual, contact your dealer. Your dealer can also provide a
demonstration of actual starting and operating procedures.

Notice

Throughout this publication, and on your power package, warnings, cautions, and notices, accompanied by the

8M0113857 1215 eng

International Hazard Symbol !, may be used to alert the installer and user to special instructions concerning a
particular service or operation that may be hazardous if performed incorrectly or carelessly. Observe them carefully.

These safety alerts alone cannot eliminate the hazards that they signal. Strict compliance with these special instructions
while performing the service, plus common sense operation, are major accident prevention measures.

WARNING

!

Indicates a hazardous situation which, if not avoided, could result in death or serious injury.

!

CAUTION

Indicates a hazardous situation which, if not avoided, could result in minor or moderate injury.

NOTICE

Indicates a situation which, if not avoided, could result in engine or major component failure.

IMPORTANT: Identifies information essential to the successful completion of the task.

NOTE: Indicates information that helps in the understanding of a particular step or action.

IMPORTANT: The operator (driver) is responsible for the correct and safe operation of the boat, the equipment aboard,
and the safety of all occupants aboard. We strongly recommend that the operator read this Operation and Maintenance
Manual and thoroughly understand the operational instructions for the power package and all related accessories before
the boat is used.

WARNING

!

The engine exhaust from this product contains chemicals known to the state of California to cause cancer, birth
defects or other reproductive harm.

4.3 TKS Models (Non-ECT)

The serial numbers are the manufacturer’s keys to numerous engineering details that apply to your Mercury Marine
power package. When contacting Mercury Marine about service, always specify model and serial numbers.

Descriptions and specifications contained herein were in effect at the time this was approved for printing. Mercury
Marine, whose policies are based on continuous improvement, reserves the right to discontinue models at any time or to
change specifications or designs without notice and without incurring obligation.

© 2016 Mercury Marine

Warranty Message

The product you have purchased comes with a limited warranty from Mercury Marine; the terms of the warranty are set forth
in the Warranty Manual included with the product. The Warranty Manual contains a description of what is covered, what is not
covered, the duration of coverage, how to best obtain warranty coverage, important disclaimers and limitations of
damages, and other related information. Please review this important information.

Copyright and Trademark Information

© MERCURY MARINE. All rights reserved. Reproduction in whole or in part without permission is prohibited.

Alpha, Axius, Bravo One, Bravo Two, Bravo Three, Circle M with Waves Logo, K‑planes, Mariner, MerCathode, MerCruiser,
Mercury, Mercury with Waves Logo, Mercury Marine, Mercury Precision Parts, Mercury Propellers, Mercury Racing,
MotorGuide, OptiMax, Quicksilver, SeaCore, Skyhook, SmartCraft, Sport‑Jet, Verado, VesselView, Zero Effort, Zeus, #1 On the
Water and We're Driven to Win are registered trademarks of Brunswick Corporation. Pro XS is a trademark of Brunswick
Corporation. Mercury Product Protection is a registered service mark of Brunswick Corporation.

Identification Records

Please record the following applicable information:

MerCruiser

Engine Model and Horsepower Engine Serial Number

Transom Assembly Serial Number (Sterndrive) Gear Ratio Sterndrive Unit Serial Number

Transmission Model (Inboard) Gear Ratio Transmission Serial Number

Propeller Number Pitch Diameter

Hull Identification Number (HIN) Purchase Date

Boat Manufacturer Boat Model Length

Exhaust Gas Emissions Certification Number (Europe Only)

TABLE OF CONTENTS

Section 1 - Getting to Know Your Power Package

Identification............................................................................... 2

Engine Serial Number Decal ............................................. 2

Alpha Sterndrive Serial Number......................................... 2

Alpha Transom Serial Number........................................... 2

Bravo Sterndrive Serial Number and Identification............. 3

Bravo Transom Serial Number........................................... 4

Lanyard Stop Switch.................................................................. 4

Keep the Lanyard Stop Switch and Lanyard Cord in Good

Operating Condition............................................................. 5

Instrumentation.......................................................................... 5

VesselView........................................................................... 5

SmartCraft Digital Instruments............................................. 6

Section 2 - On the Water

Safe Boating Recommendations............................................. 14

Carbon Monoxide Exposure.................................................... 15

Be Alert To Carbon Monoxide Poisoning........................... 15

Stay Clear of Exhaust Areas.............................................. 15

Good Ventilation ................................................................ 15

Poor Ventilation ................................................................. 16

Basic Boat Operation............................................................... 16

Launching and Boat Operation......................................... 16

Operation Chart............................................................ 16

Starting and Stopping the Engine..................................... 17

Starting the Engine....................................................... 17

Stopping the Engine..................................................... 17

Starting the Engine After It Has Been Stopped While In

Gear.................................................................................. 17

Throttle Only Operation.................................................... 17

Trailering the Boat............................................................ 18

Freezing Temperature Operation..................................... 18

Drain Plug and Bilge Pump............................................... 18

Protecting People in the Water................................................ 18

While You Are Cruising...................................................... 18

While Boat Is Stationary..................................................... 18

System Link Digital Instruments........................................... 6

Remote Controls........................................................................ 7

Panel Mount Features.......................................................... 7

Console Mount Features...................................................... 8

Power Trim................................................................................. 8

Single Engine Trim/Trailer.................................................... 9

Dual Engine Trim/Trailer...................................................... 9

Electrical System Overload Protection—Carbureted

Engines...................................................................................... 9

Audio Warning System............................................................ 12

Testing the Audio Warning System.................................... 12

High‑Speed and High‑Performance Operation........................ 18

Passenger Safety in Pontoon Boats and Deck Boats.............. 18

Boats Having an Open Front Deck.....................................18

Boats With Front‑Mounted, Raised Pedestal Fishing Seats

........................................................................................... 19

Wave and Wake Jumping........................................................ 19

Impact with Underwater Hazards............................................. 20

Drive Unit Impact Protection...............................................20

Operating with Low Water Inlets in Shallow Water.................. 21

Conditions Affecting Operation................................................ 21

Weight Distribution (Passengers and Gear) Inside the

Boat.................................................................................. 21

The Bottom of the Boat..................................................... 21

Cavitation.......................................................................... 21

Ventilation......................................................................... 21

Elevation and Climate....................................................... 22

Propeller Selection............................................................ 22

Getting Started......................................................................... 22

20‑Hour Break‑In Period................................................... 22

After Break‑In Period........................................................ 22

End of First Season Checkup........................................... 23

Section 3 - Specifications

Fuel Requirements................................................................... 26

Fuel Ratings....................................................................... 26

Using Reformulated (Oxygenated) Gasoline (USA Only)

........................................................................................... 26

Gasoline Containing Alcohol.............................................. 26

Bu16 Butanol Fuel Blends............................................ 26

Methanol and Ethanol Fuel Blends...............................26

Engine Oil................................................................................ 26

Engine Specifications............................................................... 27

4.3 TKS............................................................................. 27

Fluid Specifications.................................................................. 28

Engine................................................................................ 28

Sterndrives......................................................................... 28

Section 4 - Maintenance

Owner/Operator Responsibilities............................................. 30

Dealer Responsibilities............................................................ 30

90-8M0113857 eng DECEMBER 2015 Page i

Maintenance............................................................................ 30

Do‑It‑Yourself Maintenance Suggestions................................ 30

Inspection............................................................................... 31

Maintenance Schedule–Sterndrive Models............................ 31

Routine Maintenance...................................................... 31

Scheduled Maintenance.................................................. 31

Sealed Carburetor Mixture Screw.......................................... 32

Engine Oil............................................................................... 32

Checking........................................................................... 33

Filling................................................................................ 33

Changing Oil and Filter..................................................... 33

Easy Engine Oil Drain System.................................... 33

Engine Oil Drain Pump................................................34

Changing Filter............................................................ 34

Power Steering Fluid.............................................................. 35

Checking........................................................................... 35

Filling................................................................................ 35

Changing.......................................................................... 35

Engine Coolant....................................................................... 35

Checking........................................................................... 35

Filling................................................................................ 36

Changing ......................................................................... 37

Alpha Sterndrive Gear Lube................................................... 37

Checking........................................................................... 37

Filling................................................................................ 37

Changing.......................................................................... 38

Sterndrive Gear Lube............................................................. 39

Checking......................................................................... 39

Filling............................................................................... 39

Changing......................................................................... 39

Power Trim Fluid.................................................................... 41

Checking........................................................................... 41

Filling................................................................................ 41

Changing.......................................................................... 41

Cleaning the Flame Arrestor................................................... 42

Positive Crankcase Ventilation (PCV) Valve ................... 42

Changing..................................................................... 42

Changing the Water‑Separating Fuel Filter............................ 43

Lubrication.............................................................................. 43

Steering System.............................................................. 43

Shift Plate Control Cable Lubrication.............................. 45

Driveshaft U‑joint Splines and O‑Rings (Sterndrive Unit

Removed)........................................................................ 45

Engine Coupler................................................................ 45

Driveshaft Extension Models........................................... 46

Propellers............................................................................... 46

Propeller Repair.............................................................. 46

Alpha Propeller Removal................................................. 47

Alpha Propeller Installation.............................................. 47

Bravo One Propeller Removal......................................... 48

Bravo One Propeller Installation...................................... 48

Bravo Two Propeller Removal......................................... 49

Bravo Two Propeller Installation...................................... 49

Bravo Three Propeller Removal...................................... 50

Bravo Three Propeller Installation................................... 51

Serpentine Drive Belt.............................................................. 52

Checking........................................................................... 52

Replacing Belt and/or Adjusting Tension.......................... 53

Flushing the Power Package (Alpha)..................................... 53

Flushing Attachments....................................................... 54

Sterndrive Water Pickups................................................. 54

Flushing the Power Package (Bravo)..................................... 55

General Information......................................................... 55

Flushing the Power Package........................................... 55

Flushing Attachments..................................................55

Sterndrive Water Pickups............................................56

Alternative Water Pickups........................................... 57

SeaCore Power Package Flushing Procedure................ 58

Models Using The Sterndrive Water Pickup............... 58

Battery.................................................................................... 61

Corrosion Protection............................................................... 61

Corrosion Information...................................................... 61

Maintaining Ground Circuit Continuity............................. 61

Sterndrive Corrosion Protection Components................. 62

MerCathode System Battery Requirements.................... 64

MerCathode Theory of Operation.................................... 64

Power Package Exterior Surfaces................................... 65

Boat Bottom Care............................................................ 65

Painting Your Power Package......................................... 65

Sterndrive Surface Care.................................................. 66

Section 5 - Storage

Cold Weather or Extended Storage........................................ 70

Reformulated (Oxygenated) Gasolines (U.S.A. Only)..... 70

Fuel Containing Alcohol.................................................. 70

Preparing Power Package for Storage—Carburetor

Models............................................................................. 71

Engine and Fuel System Preparation......................... 71

Draining the Seawater System............................................... 72

Drain System Identification.............................................. 72

Air Actuated Single‑Point Drain System......................72

Manual Single‑Point Drain System, Seawater cooled

models ........................................................................73

4.3 ECT Single‑Point Drain System with Plug............ 73

Three‑Point Manual Drain System, Seawater

cooled..........................................................................73

Multipoint Drain (MPD) System................................... 74

Air Actuated Single‑Point Drain System.......................... 74

Boat in the Water........................................................ 74

Boat Out of the Water................................................. 76

Manual Single‑Point Drain System (Alpha)..................... 78

Boat in the Water........................................................ 78

Boat Out of the Water................................................. 79

Three‑Point Manual Drain System—Seawater Cooled... 81

Boat in the Water........................................................ 81

Boat Out of the Water................................................. 81

Draining Water from the Gen III Cool Fuel Module......... 82

Draining the Sterndrive........................................................... 82

Battery Storage....................................................................... 83

Recommissioning the Power Package................................... 83

Section 6 - Troubleshooting

Starter Motor Will Not Crank Engine, or Cranks Slow............ 86

Engine Will Not Start or Is Hard to Start................................. 86

Page ii 90-8M0113857 eng DECEMBER 2015

Engine Runs Rough, Misses, or Backfires............................. 86

Poor Performance.................................................................. 86

Excessive Engine Temperature............................................... 87

Insufficient Engine Temperature.............................................. 87

Low Engine Oil Pressure......................................................... 87

Battery Will Not Recharge........................................................ 87

Remote Control Is Difficult to Move, Has Excessive Play, or

Makes Unusual Sounds........................................................... 87

Section 7 - Customer Assistance Information

Steering Wheel Jerks or Is Difficult to Turn.............................. 88

Power Trim Does Not Operate (Motor Does Not Operate)...... 88

Power Trim Does Not Operate (Motor Operates but Sterndrive

Unit Does Not Move)................................................................ 88

Owner Service Assistance....................................................... 90

Local Repair Service.......................................................... 90

Service Away From Home..................................................90

Stolen Power Package....................................................... 90

Attention Required After Submersion................................. 90

Replacement Service Parts................................................ 90

Parts and Accessories Inquiries................................... 90

Resolving a Problem.......................................................... 90

Contact Information for Mercury Marine Customer Service

........................................................................................... 91

Customer Service Literature.................................................... 91

English Language.............................................................. 91

Other Languages................................................................92

Ordering Literature................................................................... 92

United States and Canada................................................. 92

Outside the United States and Canada.............................. 92

Section 8 - Checklists

Predelivery Inspection (PDI).................................................... 94 Customer Delivery Inspection (CDI)........................................ 95

Section 9 - Maintenance Log

Scheduled Maintenance Log................................................... 98 Vessel Maintenance Notes...................................................... 99

90-8M0113857 eng DECEMBER 2015 Page iii

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Section 1 - Getting to Know Your Power Package

Section 1 - Getting to Know Your Power Package

Table of Contents

Identification........................................................................... 2

Engine Serial Number Decal .......................................... 2

Alpha Sterndrive Serial Number...................................... 2

Alpha Transom Serial Number........................................ 2

Bravo Sterndrive Serial Number and Identification.......... 3

Bravo Transom Serial Number........................................ 4

Lanyard Stop Switch............................................................... 4

Keep the Lanyard Stop Switch and Lanyard Cord in

Good Operating Condition .............................................. 5

Instrumentation....................................................................... 5

VesselView ..................................................................... 5

SmartCraft Digital Instruments ....................................... 6

1

System Link Digital Instruments ..................................... 6

Remote Controls..................................................................... 7

Panel Mount Features .................................................... 7

Console Mount Features ................................................ 8

Power Trim............................................................................. 8

Single Engine Trim/Trailer .............................................. 9

Dual Engine Trim/Trailer ................................................. 9

Electrical System Overload Protection—Carbureted Engines

................................................................................................ 9

Audio Warning System......................................................... 12

Testing the Audio Warning System .............................. 12

90-8M0113857 eng DECEMBER 2015 Page 1

Section 1 - Getting to Know Your Power Package

26301

54406

Transom Serial No.

53651

Identification

The serial numbers are the manufacturer's keys to numerous engineering details which apply to your MerCruiser power
package. When contacting MerCruiser about service, always specify model and serial numbers.

Engine Serial Number Decal

The serial number decal is located on the engine cover.

Serial numbers and maintenance color codes decal

The engine serial number is also stamped in the engine block.

Alpha Sterndrive Serial Number

The drive serial number and the drive ratio are located on the port side of the sterndrive.

Alpha sterndrive

Alpha Transom Serial Number

The Alpha transom serial number is stamped in the transom assembly decal.

Page 2 90-8M0113857 eng DECEMBER 2015

Section 1 - Getting to Know Your Power Package

44425

33533

33534

The serial number is also stamped on the gimbal housing. This is used as a permanent reference for authorized MerCruiser
dealers.

Serial number location on gimbal housing

Bravo Sterndrive Serial Number and Identification

The Bravo sterndrive serial number, gear ratio, model number, and bar code are embedded in the ground plate on the port side
of the sterndrive.

Bravo sterndrive information on ground plate

The serial number is also stamped as a permanent reference on the sterndrive casting inside the back cover.

Bravo sterndrive serial number stamping

90-8M0113857 eng DECEMBER 2015 Page 3

Section 1 - Getting to Know Your Power Package

25904

a

25905

a

c

a

b

53910

OFF

RUN

ATTACH LANYARD

Bravo Transom Serial Number

The Bravo transom serial number is stamped in the U‑bolt plate of the Bravo transom assembly.

Bravo transom assembly U-bolt plate

a - Transom assembly serial number

The serial number is also stamped on the gimbal housing. This is used as a permanent reference for authorized MerCruiser
dealers.

Gimbal housing with serial
number stamping

a - Transom assembly serial

number

Lanyard Stop Switch

A lanyard switch is designed to shut down the engine in the event the operator unexpectedly moves away from the helm, as
may happen in an accidental ejection. The lanyard is connected to the operator's personal flotation device or wrist.

A decal near the lanyard stop switch reminds the operator to attach the lanyard to his or her personal flotation device or wrist.

a - Lanyard cord clip
b - Lanyard decal
c - Lanyard stop switch

Accidental ejections, such as falling overboard, are more likely to occur in:

• Low‑sided sport boats

• Bass boats

Page 4 90-8M0113857 eng DECEMBER 2015

Section 1 - Getting to Know Your Power Package

• High‑performance boats
Accidental ejections can also occur from:

• Poor operating practices

• Sitting on the seat or gunwale at planing speeds

• Standing at planing speeds

• Operating at planing speeds in shallow or obstacle‑infested waters

• Releasing your grip on the steering wheel

• Carelessness caused by consuming alcohol or drugs

• High‑speed boating maneuvers
The lanyard is a cord usually between 122 and 152 cm (4 and 5 ft) long when stretched out, with an element on one end made

to be inserted into the switch, and a snap on the other end for attaching to the operator. The lanyard is coiled to make its at‑rest
condition as short as possible to minimize the likelihood of lanyard entanglement with nearby objects. Its stretched‑out length is
made to minimize the likelihood of accidental activation should the operator choose to move around in an area close to the
operator's normal position. The operator can shorten the lanyard by wrapping the lanyard around his wrist, or by tying a knot in
the lanyard.

Activation of the lanyard stop switch will stop the engine immediately, but the boat will continue to coast for some distance,
depending upon its velocity. While the boat is coasting, it can cause injury to anyone in the boat's path as it would under power.

Instruct all passengers on the proper starting and operating procedures should they be required to operate the boat in an
emergency.

WARNING

!

If the operator falls out of the boat, stop the engine immediately to reduce the possibility of serious injury or death from being
struck by the boat. Always properly connect the operator to the stop switch using a lanyard.

Accidental or unintended activation of the switch during normal operation is also a possibility. This could cause any, or all, of
the following potentially hazardous situations:

• Occupants could be thrown forward due to unexpected loss of forward motion, a particular concern for passengers in the
front of the boat who could be ejected over the bow and possibly struck by the propulsion or steering components.

• Loss of power and directional control in heavy seas, strong current, or high winds.

• Loss of control when docking.

WARNING

!

Avoid serious injury or death from deceleration forces resulting from accidental or unintended stop switch activation. The boat
operator should never leave the operator's station without first disconnecting the stop switch lanyard from the operator.

Keep the Lanyard Stop Switch and Lanyard Cord in Good Operating Condition

Before each use, ensure that the lanyard stop switch works properly. Start the engine, and then stop it by pulling the lanyard
cord. If the engine does not stop, have the switch repaired before operating the boat.

Before each use, inspect the lanyard cord to ensure that it is in good working condition and that there are no breaks, cuts, or
wear to the cord. Check that the clips on the ends of the cord are in good condition. Replace any damaged or worn lanyard
cords.

Instrumentation

VesselView

There are several VesselView products available. VesselView will display all engine information, fault codes, vessel
information, basic navigation data, and system information. When an operating system error or failure occurs, VesselView
displays an alarm message.

VesselView may also be connected to other vessel systems such as GPS, generators, and chartplotters. This vessel
integration allows the operator to monitor and control a wide range of vessel systems from a single display.

90-8M0113857 eng DECEMBER 2015 Page 5

Section 1 - Getting to Know Your Power Package

56038

a

b

c

c

50400

Refer to the VesselView operator's manual for more information.

VesselView 7

SmartCraft Digital Instruments

The SmartCraft instrument package augments the VesselView display. The instrument package may include:

• Tachometer

• Speedometer

• Engine coolant temperature

• Engine oil pressure

• Battery voltage

• Fuel consumption

• Engine operating hours

SmartCraft tachometer and speedometer

a - Tachometer
b - Speedometer
c - LCD display

The SmartCraft instrument package also aids in identifying fault codes associated with the engine audio warning system. The
SmartCraft instrument package displays critical engine alarm data and other potential problems on its LCD display.

For basic operation information on the SmartCraft instrument package and for details on the warning functions monitored by the
system, refer to the manual provided with your gauge package.

System Link Digital Instruments

Some instrumentation packages include system link gauges that augment the information provided by VesselView or a
SmartCraft system tachometer and speedometer. The owner and operator should be familiar with all the instruments and their
functions on the boat. Have your boat dealer explain the gauges and normal readings that appear on your boat.

Page 6 90-8M0113857 eng DECEMBER 2015

Section 1 - Getting to Know Your Power Package

abc

d

37925

The following digital instruments may be included with your power package.

System Link digital gauges

Item Gauge Indicates

a Oil pressure gauge Engine oil pressure
b Voltmeter Battery voltage
c Water temperature gauge Engine operating temperature
d Fuel gauge Quantity of fuel in tank

Remote Controls

Your boat may be equipped with Mercury Precision Parts or Quicksilver remote controls. All controls may not have all features
shown. Consult your dealer for a description and/or demonstration of your remote control.

Panel Mount Features

a

f

b

e

a - Neutral lock button
b - Throttle only button
c - Lanyard stop switch
d - Control handle tension adjustment screw
e - Control handle
f - Trim/tilt button

c

d

mc77019-1

Neutral lock button ‑ Prevents accidental shift and throttle engagement. Neutral lock button must be pushed into move the

control handle out of neutral.
Throttle only button ‑ Allows engine throttle advancement without shifting the engine. This is done by disengaging the shift

mechanism from the control handle. The throttle only button can be depressed only when the remote control handle is in the
neutral position, and should only be used to assist in starting the engine.

Lanyard stop switch ‑ Turns the ignition off whenever the operator (when attached to the lanyard) moves far enough away
from the operator's position to activate the switch. Refer to Lanyard Stop Switch for information on the use of this switch.

Control handle ‑ Operation of the shift and throttle are controlled by the movement of the control handle. Push the control
handle forward from neutral with a quick firm motion to the first detent for forward gear. Continue pushing forward to increase
speed. Pull the control handle back from neutral with a quick firm motion to the first detent for reverse gear and continue
pushing back to increase speed.

Control handle tension adjustment screw (not visible) ‑ This screw is used to adjust the effort required to move the remote
control handle. Refer to instructions provided with remote control for complete adjustment instructions.

Trim/tilt button ‑ Refer to Power Trim.

90-8M0113857 eng DECEMBER 2015 Page 7

Section 1 - Getting to Know Your Power Package

Console Mount Features

b

b

c

d

a

a

Throttle only button ‑ Allows engine throttle advancement without shifting the engine. This is done by disengaging the shift

mechanism from the control handle. The throttle only button can be depressed only when the remote control handle is in the
neutral position.

Control handles ‑ Operation of the shift and throttle are controlled by the movement of the control handle. Push the control
handle forward from neutral with a quick firm motion to the first detent for forward gear and continue pushing forward to
increase speed. Pull the control handle back from neutral with a quick firm motion to the first detent for reverse gear and
continue pushing back to increase speed.

Control handle tension adjustment screw (not visible) ‑ This screw is used to adjust the effort required to move the remote
control handle. Refer to instructions provided with remote control for complete adjustment instructions.

Power trim switch ‑ See Power Trim section for detailed power trim operating procedures.
Trailer switch ‑ Used to raise drive unit for trailering, launching, beaching or shallow water operation. See Power Trim for

detailed trailer switch operation.

c

d

mc79503-1

a - Throttle only button
b - Control handle
c - Power trim switch
d - Trailer switch

Power Trim

Power trim allows the operator to adjust the sterndrive angle while underway, to provide the ideal boat angle for varying load
and water conditions. Also, the trailering feature allows the operator to raise and lower the sterndrive unit for trailering,
beaching, launching, low speed (below 1200 RPM engine speed), and shallow water operation.

WARNING

!

Excessive trim can cause serious injury or death at high speeds. Use caution when trimming the sterndrive, and never trim
out beyond the gimbal ring support flanges while the boat is underway or at engine speeds above 1200 RPM.

For best performance trim the sterndrive unit so that the boat bottom is at a 3–5° angle to the water.

3 - 5

mc79528

Trimming sterndrive unit up/out can:

• Generally increase top speed

• Increase clearance over submerged objects or a shallow bottom

• Cause boat to accelerate and plane off slower

• In excess, cause boat porpoising (bouncing) or propeller ventilation

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Section 1 - Getting to Know Your Power Package

• Cause engine overheating if trimmed up/out to a point where any cooling water intake holes are above the waterline

mc78529

Trimming sterndrive unit down/in can:

• Help the boat accelerate and plane off quicker

• Generally improve the ride in choppy water

• In most cases, reduce boat speed

• If in excess, lower the bow of some boats to a point at which they begin to plow with their bow in the water while on plane.
This can result in an unexpected turn in either direction called bow steering or over steering if any turn is attempted or if a
significant wave is encountered.

mc79530

Single Engine Trim/Trailer

Single engine applications will have a button that can be pressed to trim the sterndrive unit up or down.
To raise the sterndrive unit for trailering, beaching, launching, low speed (below 1200 RPM), and shallow water operation push

the trim button to raise the sterndrive unit to the full up/out position.
Some controls also have a trailer button that trims the sterndrive to a position suitable for trailer purposes only.

Dual Engine Trim/Trailer

NOTICE

If using external tie bars, raising or lowering the drives independently of each other can damage the drive and steering
systems. If using an external tie bar, raise and lower all drives together as a unit.

Dual engine applications may have a single integral button to operate both sterndrive units simultaneously or may have
separate buttons for each sterndrive unit.

Some controls also have a trailer button that trims the sterndrives to a position suitable for trailer purposes only.

Electrical System Overload Protection—Carbureted Engines

If an electrical overload occurs, a fuse will blow or the circuit breaker will open. The cause must be found and corrected before
replacing the fuse or resetting the circuit breaker.

NOTE: In an emergency, when the engine must be operated and the cause for the high current draw cannot be located and
corrected, turn off or disconnect all accessories connected to the engine and instrumentation wiring. Reset the circuit breaker. If
the breaker remains open, the electrical overload has not been eliminated. Further checks must be made on the electrical
system. Contact your authorized dealer as soon as possible.

90-8M0113857 eng DECEMBER 2015 Page 9

Section 1 - Getting to Know Your Power Package

51185

1. A circuit breaker protects the engine wiring harness and the instrumentation power lead. Reset the breaker by pushing the
red button.

Engine wiring harness and instrumentation circuit breaker

2. A 20‑amp fuse is located near the carburetor body. This fuse protects the fuel pump and ignition system circuits.

7524

3. A 90‑amp fuse, located on the large post of the starter solenoid, protects the engine wiring harness if an electrical overload
occurs.

mc74907-1

Page 10 90-8M0113857 eng DECEMBER 2015

Section 1 - Getting to Know Your Power Package

4. A 15‑amp accessory fuse is located on the rear of the engine. This fuse protects the accessory circuits.

7524

5. A 20‑amp fuse may be located in the ignition switch "I" terminal lead to protect the electrical system. Check for an open

fuse or an open circuit breaker if the ignition key is turned to the "START" position and nothing happens.

mc70525-1

6. The power trim system is protected from overload by a 110‑amp fuse and a 20‑amp spade fuse on the power trim pump.

The trim pump may also have an in‑line circuit protection device in the power trim positive lead near the battery switch or
battery connection.

a - 20‑amp spade fuse
b - 110‑amp fuse

a

b

9208

90-8M0113857 eng DECEMBER 2015 Page 11

Section 1 - Getting to Know Your Power Package

a

c

50534

b

7. The Quicksilver MerCathode system has a 20‑amp fuse which connects to the positive (+) terminal on the controller. If the
fuse is open, the system will not operate resulting in a loss of corrosion protection.

a - MerCathode
b - Red/purple wire
c - 20‑amp fuse

Audio Warning System

The Mercury MerCruiser power package may be equipped with an audio warning system. The audio warning system will not
protect the engine from damage. It is designed to warn the operator that a problem has occurred.

The audio warning system will sound with a continuous horn if one of the following occurs:

• Engine oil pressure too low

• Engine temperature too hot

• Sterndrive oil level too low (if equipped with a drive reservoir having low oil level switch)

• Transmission temperature is too hot (if equipped)

NOTICE

A continuous horn indicates a critical fault. Operating the engine during a critical fault can damage components. If the
warning horn emits a continuous beep, do not operate the engine unless avoiding a hazardous situation.

If the alarm sounds, stop the engine immediately. Investigate cause and correct it, if possible. If the cause cannot be
determined, contact your authorized Mercury MerCruiser dealer.

Testing the Audio Warning System

1. Turn the ignition switch to the "ON" position without cranking the engine.

2. Listen for the audio alarm. The alarm will sound if the system is functioning correctly.

Page 12 90-8M0113857 eng DECEMBER 2015

Table of Contents

Section 2 - On the Water

Section 2 - On the Water

Safe Boating Recommendations.......................................... 14

Carbon Monoxide Exposure................................................. 15

Be Alert To Carbon Monoxide Poisoning ..................... 15

Stay Clear of Exhaust Areas ........................................ 15

Good Ventilation .......................................................... 15

Poor Ventilation ........................................................... 16

Basic Boat Operation............................................................ 16

Launching and Boat Operation...................................... 16

Operation Chart ..................................................... 16

Starting and Stopping the Engine.................................. 17

Starting the Engine ................................................ 17

Stopping the Engine .............................................. 17

Starting the Engine After It Has Been Stopped While In

Gear............................................................................... 17

Throttle Only Operation................................................. 17

Trailering the Boat......................................................... 18

Freezing Temperature Operation.................................. 18

Drain Plug and Bilge Pump............................................18

Protecting People in the Water............................................. 18

While You Are Cruising ................................................ 18

While Boat Is Stationary ............................................... 18

High‑Speed and High‑Performance Operation..................... 18

Passenger Safety in Pontoon Boats and Deck Boats.......... 18

Boats Having an Open Front Deck ............................... 18

Boats With Front‑Mounted, Raised Pedestal Fishing

Seats ............................................................................ 19

Wave and Wake Jumping..................................................... 19

Impact with Underwater Hazards......................................... 20

Drive Unit Impact Protection ......................................... 20

Operating with Low Water Inlets in Shallow Water............... 21

Conditions Affecting Operation............................................. 21

Weight Distribution (Passengers and Gear) Inside the

Boat............................................................................... 21

The Bottom of the Boat.................................................. 21

Cavitation....................................................................... 21

Ventilation...................................................................... 21

Elevation and Climate.................................................... 22

Propeller Selection.........................................................22

Getting Started..................................................................... 22

20‑Hour Break‑In Period................................................ 22

After Break‑In Period..................................................... 22

End of First Season Checkup........................................ 23

2

90-8M0113857 eng DECEMBER 2015 Page 13

Section 2 - On the Water

Safe Boating Recommendations

To safely enjoy the waterways, familiarize yourself with local and all other governmental boating regulations and restrictions
and consider the following suggestions.

Know and obey all nautical rules and laws of the waterways.

• We recommend that all powerboat operators complete a boating safety course. In the U.S., the U.S. Coast Guard Auxiliary,
the Power Squadron, the Red Cross, and your state or provincial boating law enforcement agency provide courses. For
more information in the U.S., call the Boat U.S. Foundation at 1‑800‑336‑BOAT (2628).

Perform safety checks and required maintenance.

• Follow a regular schedule and ensure that all repairs are properly made.

Check safety equipment onboard.

• Here are some suggestions of the types of safety equipment to carry when boating:

Approved fire extinguishers

Signal devices: flashlight, rockets or flares, flag, and whistle or horn

Tools necessary for minor repairs

Anchor and extra anchor line

Manual bilge pump and extra drain plugs

Drinking water

Radio

Paddle or oar

Spare propeller, thrust hubs, and an appropriate wrench

First aid kit and instructions

Waterproof storage containers

Spare operating equipment, batteries, bulbs, and fuses

Compass and map or chart of the area

Personal flotation device (one per person onboard)

Watch for signs of weather change and avoid foul weather and rough‑sea boating.

Tell someone where you are going and when you expect to return.

Passenger boarding.

• Stop the engine whenever passengers are boarding, unloading, or are near the back (stern) of the boat. Shifting the drive
unit into neutral is not sufficient.

Use personal flotation devices.

• Federal law requires that there be a U.S. Coast Guard‑approved life jacket (personal flotation device), correctly sized and
readily accessible for every person onboard, plus a throwable cushion or ring. We strongly advise that everyone wear a life
jacket at all times while in the boat.

Prepare other boat operators.

• Instruct at least one person onboard in the basics of starting and operating the engine and boat handling in case the driver
becomes disabled or falls overboard.

Do not overload your boat.

• Most boats are rated and certified for maximum load (weight) capacities (refer to your boat's capacity plate). Know your
boat's operating and loading limitations. Know if your boat will float if it is full of water. When in doubt, contact your
authorized Mercury Marine dealer or the boat manufacturer.

Ensure that everyone in the boat is properly seated.

• Do not allow anyone to sit or ride on any part of the boat that was not intended for such use. This includes the backs of
seats, gunwales, transom, bow, decks, raised fishing seats, and any rotating fishing seat. Passengers should not sit or ride
anywhere that sudden unexpected acceleration, sudden stopping, unexpected loss of boat control, or sudden boat
movement could cause a person to be thrown overboard or into the boat. Ensure that all passengers have a proper seat
and are in it before any boat movement.

Never operate a boat while under the influence of alcohol or drugs. It is the law.

• Alcohol or drugs can impair your judgment and greatly reduce your ability to react quickly.

Know your boating area and avoid hazardous locations.

Page 14 90-8M0113857 eng DECEMBER 2015

Section 2 - On the Water

43367

Be alert.

• The operator of the boat is responsible by law to maintain a proper lookout by sight and hearing. The operator must have

an unobstructed view particularly to the front. No passengers, load, or fishing seats should block the operator's view when
the boat is above idle or planing transition speed. Watch out for others, the water, and your wake.

Never drive your boat directly behind a water skier.

• Your boat traveling at 40 km/h (25 mph) will overtake a fallen skier who is 61 m (200 ft) in front of you in five seconds.

Watch fallen skiers.

• When using your boat for waterskiing or similar activities, always keep a fallen or down skier on the operator's side of the

boat while returning to attend to the skier. The operator should always have the down skier in sight and never back up to
the skier or anyone in the water.

Report accidents.

• Boat operators are required by law to file a boating accident report with their state boating law enforcement agency when

their boat is involved in certain boating accidents. A boating accident must be reported if 1) there is loss of life or probable
loss of life, 2) there is personal injury requiring medical treatment beyond first aid, 3) there is damage to boats or other
property where the damage value exceeds $500.00, or 4) there is complete loss of the boat. Seek further assistance from
local law enforcement.

Carbon Monoxide Exposure

Be Alert To Carbon Monoxide Poisoning

Carbon monoxide (CO) is a deadly gas that is present in the exhaust fumes of all internal combustion engines, including the
engines that propel boats, and the generators that power boat accessories. By itself, CO is odorless, colorless, and tasteless,
but if you can smell or taste engine exhaust, you are inhaling CO.

Early symptoms of carbon monoxide poisoning, which are similar to the symptoms of seasickness and intoxication, include
headache, dizziness, drowsiness, and nausea.

WARNING

!

Inhaling engine exhaust gases can result in carbon monoxide poisoning, which can lead to unconsciousness, brain damage,
or death. Avoid exposure to carbon monoxide.

Stay clear from exhaust areas when engine is running. Keep the boat well‑ventilated while at rest or underway.

Stay Clear of Exhaust Areas

Engine exhaust gases contain harmful carbon monoxide. Avoid areas of concentrated engine exhaust gases. When engines
are running, keep swimmers away from the boat, and do not sit, lie, or stand on swim platforms or boarding ladders. While
underway, do not allow passengers to be positioned immediately behind the boat (platform dragging, teak/body surfing). This
dangerous practice not only places a person in an area of high engine exhaust concentration, but also subjects them to the
possibility of injury from the boat propeller.

Good Ventilation

Ventilate the passenger area, open side curtains or forward hatches to remove fumes.
Example of desired air flow through the boat:

90-8M0113857 eng DECEMBER 2015 Page 15

Section 2 - On the Water

21626

a

b

a

b

43368

Poor Ventilation

Under certain running or wind conditions, permanently enclosed or canvas enclosed cabins or cockpits with insufficient
ventilation may draw in carbon monoxide. Install one or more carbon monoxide detectors in your boat.

Although the occurrence is rare, on a very calm day, swimmers and passengers in an open area of a stationary boat that
contains or is near a running engine may be exposed to a hazardous level of carbon monoxide.

1. Examples of poor ventilation while the boat is stationary:

a - Operating the engine when the boat

is moored in a confined space

b - Mooring close to another boat that

has its engine operating

2. Examples of poor ventilation while the boat is moving:

a - Operating the boat with the

trim angle of the bow too
high

b - Operating the boat with no

forward hatches open
(station wagon effect)

Basic Boat Operation

Launching and Boat Operation

IMPORTANT: Install bilge drain plug prior to launching boat.

Operation Chart

Operation Chart

BEFORE STARTING AFTER STARTING WHILE UNDERWAY AFTER STOPPING

Observe all gauges to

Install bilge drain plug.

Open engine hatch.

Turn battery switch on.

Operate bilge blowers. Check steering operation.

Open fuel shut off valve.

Open seacock, if equipped. Drain bilge.
Close the drain system.
Place sterndrive unit in full down/in

position.
Check the engine oil.
Perform all other checks specified by your

dealer and/or boatbuilder.
Listen for the audio warning alarm to sound

when the ignition switch is in the "ON"
position.

check condition of engine.
If not normal, stop engine.

Check for fuel, oil, water,
fluid, and exhaust leaks.

Check shift and throttle
control operation.

Observe all gauges to
check condition of
engine. If not normal,
stop engine.

Listen for the audio
alarm.

Turn ignition key to the
"OFF" position.

Turn battery switch to the
"OFF" position.

Close fuel shut off valve.

Close seacock, if
equipped.

Flush cooling system if in
saltwater.

Page 16 90-8M0113857 eng DECEMBER 2015

Section 2 - On the Water

Starting and Stopping the Engine

NOTE: Only perform those functions applicable to your power package.

Starting the Engine

1.

Check all items listed in the Operation Chart.

2. Place the remote control handle in neutral.

NOTICE

Without sufficient cooling water, the engine, the water pump, and other components will overheat and suffer damage. Provide
a sufficient supply of water to the water inlets during operation.

WARNING

!

Explosive fumes contained in the engine compartment can cause serious injury or death from fire or explosion. Before
starting the engine, operate the bilge blower or vent the engine compartment for at least five minutes.

3. Turn ignition key to "START." Release key when engine starts and allow switch to return to the "ON" position. Allow engine

to warm up (6–10 minutes on first start of the day).

NOTE: If the engine has not run for a long period of time it may require a couple of attempts while the fuel bowl refills.

4. If engine does not start after three attempts:

a. Push the throttle only button and position the remote control handle/throttle lever to the 1/4 throttle position.
b. Turn ignition key to "START." Release key when engine starts and allow switch to return to the "ON" position.

5. If engine does not start after step 4:

a. Move the remote control handle/throttle lever to full throttle position, then return to 1/4 throttle.
b. Turn ignition key to "START." Release key when engine starts and allow switch to return to the "ON" position.

6. Inspect the power package for fuel, oil, water, and exhaust leaks.

7. Move control handle with a firm, quick motion forward to shift to forward gear, or backward to shift to reverse. After shifting,

advance throttle to desired setting.

NOTICE

Shifting into gear at engine speeds above idle will damage the gearcase. Shifting into gear when the engine is not running
can misalign the clutch, preventing proper shifting. Always shift the gearcase into gear when the engine is operating at idle. If
you must shift while the engine is not operating, rotate the propeller shaft in the appropriate direction during shifting.

Stopping the Engine

1. Move the remote control handle to neutral/idle and allow the engine to slow to idle speed. If engine has been operated at

high speed for a long period of time, allow the engine to cool at idle speed for 3–5 minutes.

2. Turn ignition key to the "OFF" position.

Starting the Engine After It Has Been Stopped While In Gear

IMPORTANT: Avoid stopping the engine if the sterndrive unit is in gear. If the engine does stop, refer to the following
procedure:

1. Push and pull repeatedly on the remote control handle until handle returns to the neutral/idle position. This may take

several tries if the power package was operating above idle RPM when the engine stopped.

2. After the handle returns to the neutral/idle position, resume normal starting procedures.

Throttle Only Operation

1.

Refer to Remote Controls section for remote control features.

2. Move the control lever to the idle/neutral position.

3. Depress and hold the throttle only button, and move the control lever to the idle/forward or idle/reverse position.

4. Advancing the control lever beyond the idle/forward or idle/reverse position will cause engine speed to increase.

IMPORTANT: Moving the control lever back to the idle/neutral position will disengage the throttle only button and allow the
engine to shift into gear.

5. Throttle only mode is deactivated by moving the control lever to the idle/neutral position. Moving the control lever from the

idle/neutral position to the idle/forward or idle/reverse position without pressing the throttle only button will shift the unit into
the chosen gear.

90-8M0113857 eng DECEMBER 2015 Page 17

Section 2 - On the Water

21604

Trailering the Boat

Your boat can be trailered with the sterndrive unit in the up or down position. Adequate clearance is required between the road
and sterndrive when transporting.

If adequate road clearance is a problem, place the sterndrive unit in full trailer position and support it with an optional trailer kit
which is available from your authorized Mercury MerCruiser dealer.

Freezing Temperature Operation

IMPORTANT: If the boat is operated during periods of freezing temperature, precautions must be taken to prevent freeze
damage to the power package. Damage caused by freezing is not covered by Mercury MerCruiser Limited Warranty.

Drain Plug and Bilge Pump

The engine compartment in your boat is a natural place for water to collect. For this reason, boats are normally equipped with a
drain plug and/or a bilge pump. It is very important to check these items on a regular basis to ensure that the water level does
not come into contact with your power package. Components on your engine will be damaged if submerged. Damage caused
by submersion is not covered by the Mercury MerCruiser Limited Warranty.

Protecting People in the Water

While You Are Cruising

It is very difficult for a person in the water to take quick action to avoid a boat heading in their direction, even at slow speeds.

Always slow down and exercise extreme caution any time you are boating in an area where there might be people in the water.
Whenever a boat is moving (even coasting) and the gear shift is in neutral, there is sufficient force by the water on the propeller

to cause the propeller to rotate. This neutral propeller rotation can cause serious injury.

While Boat Is Stationary

WARNING

!

A spinning propeller, a moving boat, or any solid device attached to the boat can cause serious injury or death to swimmers.
Stop the engine immediately whenever anyone in the water is near your boat.

Shift into neutral and shut off the engine before allowing people to swim or be in the water near your boat.

High‑Speed and High‑Performance Operation

If your boat is considered a high‑speed or high‑performance boat and you are unfamiliar with its operation, we recommend that
you never operate it at its high speed capability without first requesting an initial orientation and demonstration ride with your
dealer or an operator experienced with your boat. For additional information, refer to Hi‑Performance Boat Operation booklet
(90‑849250R03) from your dealer, distributor, or Mercury Marine.

Passenger Safety in Pontoon Boats and Deck Boats

Whenever the boat is in motion, observe the location of all passengers. Do not allow any passengers to stand or use seats
other than those designated for traveling faster than idle speed. A sudden reduction in boat speed, such as plunging into a
large wave or wake, a sudden throttle reduction, or a sharp change of boat direction, could throw them over the front of the
boat. Falling over the front of the boat between the two pontoons will position them to be run over.

Boats Having an Open Front Deck

No one should ever be on the deck in front of the fence while the boat is in motion. Keep all passengers behind the front fence
or enclosure.

Page 18 90-8M0113857 eng DECEMBER 2015

Section 2 - On the Water

Persons on the front deck could easily be thrown overboard or persons dangling their feet over the front edge could get their
legs caught by a wave and pulled into the water.

mc79555-1

WARNING

!

Sitting or standing in an area of the boat not designed for passengers at speeds above idle can cause serious injury or death.
Stay back from the front end of deck boats or raised platforms and remain seated while the boat is in motion.

Boats With Front‑Mounted, Raised Pedestal Fishing Seats

Elevated fishing seats are not intended for use when the boat is traveling faster than idle or trolling speed. Sit only in seats
designated for traveling at faster speeds.

Any unexpected, sudden reduction in boat speed could result in the elevated passenger falling over the front of the boat.

mc79557-1

Wave and Wake Jumping

WARNING

!

Wave or wake jumping can cause serious injury or death from occupants being thrown within or out of the boat. Avoid wave
or wake jumping whenever possible.

mc79680-1

Operating recreational boats over waves and wakes is a natural part of boating. However, when this activity is done with
enough speed to force the boat hull partially or completely out of the water, certain hazards arise, particularly when the boat
reenters the water.

The primary concern is the boat changing direction while in the midst of the jump. In such cases the landing may cause the
boat to violently veer in a new direction. Such a sharp change in direction or turn can cause occupants to be thrown out of their
seats or out of the boat.

There is another less common hazardous result from allowing your boat to launch off of a wave or wake. If the bow of your boat
pitches down far enough while airborne, upon water contact it may penetrate under the water surface and submarine for an
instant. This will bring the boat nearly to a stop in an instant and can send the occupants flying forward. The boat may also veer
sharply to one side.

90-8M0113857 eng DECEMBER 2015 Page 19

Section 2 - On the Water

Impact with Underwater Hazards

Reduce speed and proceed with caution whenever you're driving a boat in shallow water or in areas where the waters are
suspected of having underwater obstacles that could be struck by the underwater drive components, rudder, or the boat
bottom.

mc79679-1

IMPORTANT: The most important thing you can do to help reduce injury or impact damage from striking a floating or
underwater object is control the boat speed. Under these conditions, boat speed should be kept to a maximum speed of
24–40 km/h (15–25 mph).

Striking a floating/underwater object may result in an infinite number of situations. Some of these situations could result in the
following:

• The boat could move suddenly in a new direction. Such a sharp change in direction or turn can cause occupants to be
thrown out of their seats or out of the boat.

• A rapid reduction in speed. This will cause occupants to be thrown forward, even out of the boat.

• Impact damage to the underwater drive components, rudder, and/or boat.

Keep in mind, one of the most important things you can do to help reduce injury or impact damage in these situations is control
the boat speed. Boat speed should be kept to a minimum planing speed when driving in waters known to have underwater
obstacles.

After striking a submerged object, stop the engine as soon as possible and inspect the drive system for any broken or loose
parts. If damage is present or suspected, the power package should be taken to an authorized Mercury MerCruiser dealer for a
thorough inspection and necessary repair.

The boat should be checked for hull fractures, transom fractures, and water leaks.
Operating with damaged underwater drive components, rudder, or boat bottom could cause additional damage to other parts of

the power package, or could affect control of the boat. If continued operation is necessary, do so at greatly reduced speeds.

WARNING

!

Operating a boat or engine with impact damage can result in product damage, serious injury, or death. If the vessel
experiences any form of impact, have an authorized Mercury Marine dealer inspect and repair the vessel or power package.

Drive Unit Impact Protection

The power trim hydraulic system is designed to provide impact protection for the sterndrive unit. If a submerged object is struck
while the boat is moving forward, the hydraulic system will cushion the kickup of the sterndrive unit as it clears the object,
reducing damage to the unit. After the sterndrive unit has cleared the object, the hydraulic system allows the sterndrive unit to
return to its original operating position, preventing loss of steering control and engine overspeed.

Use extreme caution when operating in shallow water or where underwater objects are known to be present. No impact
protection is provided in reverse; use extreme care to prevent striking submerged objects while operating in reverse.

IMPORTANT: Impact protection system cannot be designed to ensure total protection from impact damage under all
conditions.

Page 20 90-8M0113857 eng DECEMBER 2015

Operating with Low Water Inlets in Shallow Water

a - Low water inlets

Section 2 - On the Water

a

mc75827-1

NOTICE

Operating in shallow water can cause severe engine damage due to clogged water inlets. Ensure that the water inlets on the
gearcase do not ingest sand, silt, or other debris, which can restrict or stop cooling water supply to the engine.

Extreme care should be exercised when operating a boat equipped with low water inlets while maneuvering in shallow water.
Also, avoid beaching a boat with the engine operating.

Conditions Affecting Operation

Weight Distribution (Passengers and Gear) Inside the Boat

Shifting weight to rear (stern):

• Generally increases speed and engine RPM

• Causes bow to bounce in choppy water

• Increases danger of following wave splashing into the boat when coming off plane

• At extremes, can cause the boat to porpoise

Shifting weight to front (bow):

• Improves ease of planing

• Improves rough water ride

• At extremes, can cause the boat to veer back and forth (bow steer)

The Bottom of the Boat

To maintain maximum speed, the boat bottom should be:

• Clean, free of barnacles and marine growth

• Free of distortion; nearly flat where it contacts the water

• Straight and smooth, fore and aft
Marine vegetation may accumulate when the boat is docked. This growth must be removed before operation; it may clog the

water inlets and cause the engine to overheat.

Cavitation

Cavitation occurs when water flow cannot follow the contour of a fast‑moving underwater object, such as a gear housing or a
propeller. Cavitation increases propeller speed while reducing boat speed. Cavitation can seriously erode the surface of the
gear housing or the propeller. Common causes of cavitation are:

• Weeds or other debris snagged on the propeller

• Bent propeller blade

• Raised burrs or sharp edges on the propeller

Ventilation

Ventilation is caused by surface air or exhaust gases that are introduced around the propeller resulting in propeller speed‑up
and a reduction in boat speed. Air bubbles strike the propeller blade and cause erosion of the blade surface. If allowed to
continue, eventual blade failure (breakage) will occur. Excessive ventilation is usually caused by:

• Drive unit trimmed out too far

• A missing propeller diffuser ring

90-8M0113857 eng DECEMBER 2015 Page 21

Section 2 - On the Water

• A damaged propeller or gear housing, which allows exhaust gases to escape between propeller and gear housing

• Drive unit installed too high on transom

Elevation and Climate

Elevation and climate changes will affect the performance of your power package. Loss of performance can be caused by:

• Higher elevations

• Higher temperatures

• Low barometric pressures

• High humidity

For you to have optimum engine performance under changing weather conditions, it is essential that the engine be propped to
allow the engine to operate at or near the top end of the specified maximum RPM range with a normal boat load during your
normal boating weather conditions.

In most cases, recommended RPM can be achieved by changing to a lower pitch propeller.

Propeller Selection

IMPORTANT: The engines covered in this manual are equipped with an RPM rev‑limiter that is set to an upper RPM limit. This
limit, which is slightly above the normal operating range of the engine, helps prevent damage from excessive engine RPM.
Once the RPM returns to the recommended operating RPM range, normal engine operation resumes.

The boat manufacturer and the selling dealer are responsible for equipping the power package with the correct propeller. Refer
to Mercury Marine's web page https://www.mercurymarine.com/en/us/propellers/selector/#/step‑one

Select a propeller that will allow the engine power package to operate at or near the top end of the recommended WOT
operating RPM range with a normal load.

If full‑throttle operation is below the recommended range, the propeller must be changed to prevent loss of performance and
possible engine damage. On the other hand, operating an engine above the recommended operating RPM range will cause
higher than normal wear and damage.

After initial propeller selection, the following common problems may require that the propeller be changed to a lower pitch.

• Warmer weather and greater humidity cause a loss of RPM.

• Operating in a higher elevation causes a loss of RPM.

• Operating with a dirty boat bottom causes a loss of RPM.

• Operating with increased load (additional passengers, pulling skiers) causes a loss of RPM.

For better acceleration, such as is needed for waterskiing, use the next lower pitch propeller. When not pulling skiers, do not
operate at full throttle when using the lower pitch propeller.

.

Getting Started

20‑Hour Break‑In Period

IMPORTANT: The first 20 hours of operation is the engine break‑in period. Correct break‑in is essential to obtain minimum oil
consumption and maximum engine performance. During this break‑in period, the following rules must be observed:

• Do not operate below 1500 RPM for extended periods of time for the first 10 hours. Shift into gear as soon as possible after
starting and advance the throttle above 1500 RPM if conditions permit safe operation.

• Do not operate at one speed consistently for extended periods.

• Do not exceed 3/4 throttle during the first 10 hours. During the next 10 hours, occasional operation at full throttle is
permissible (five minutes at a time maximum).

• Avoid full throttle acceleration from idle speed.

• Do not operate at full throttle until the engine reaches normal operating temperature.

• Frequently check engine oil level. Add oil as needed. It is normal for oil consumption to be high during the break‑in period.

After Break‑In Period

To help extend the life of your Mercury MerCruiser power package, follow these recommendations:

• Ensure that the propeller allows the engine to operate at or near the top of the specified WOT RPM range. Refer to
Specifications and Maintenance.

• Operate the engine at 3/4 throttle or lower. Refrain from prolonged operation at wide‑open throttle RPM.

•

Change the engine oil and oil filter. Refer to Maintenance.

•

Change the transmission oil and filter. Refer to Maintenance (ZF Transmission models).

1. Require fluid and filter change after the first 25 hours and then every 100 hours.

1.

Page 22 90-8M0113857 eng DECEMBER 2015

Section 2 - On the Water

End of First Season Checkup

At the end of the first season of operation, contact an authorized Mercury MerCruiser dealer to discuss and/or perform
scheduled maintenance items. If you are in an area where the product is operated continuously, year‑round, you should contact
your dealer at the end of the first 100 hours of operation or once yearly, whichever occurs first.

90-8M0113857 eng DECEMBER 2015 Page 23

Section 2 - On the Water

Notes:

Page 24 90-8M0113857 eng DECEMBER 2015

Table of Contents

Section 3 - Specifications

Section 3 - Specifications

Fuel Requirements............................................................... 26

Fuel Ratings ................................................................. 26

Using Reformulated (Oxygenated) Gasoline (USA Only)

...................................................................................... 26

Gasoline Containing Alcohol ........................................ 26

Bu16 Butanol Fuel Blends ..................................... 26

Methanol and Ethanol Fuel Blends ....................... 26

Engine Oil............................................................................. 26

Engine Specifications........................................................... 27

4.3 TKS.......................................................................... 27

Fluid Specifications............................................................... 28

Engine .......................................................................... 28

Sterndrives ................................................................... 28

3

90-8M0113857 eng DECEMBER 2015 Page 25

Section 3 - Specifications

Fuel Requirements

NOTICE

Running out of fuel can damage catalyst components. Do not allow the fuel tanks to become empty during operation.

IMPORTANT: Use of improper gasoline can damage your engine. Engine damage resulting from the use of improper
gasoline is considered misuse of the engine and will not be covered under the limited warranty.

Fuel Ratings

Mercury MerCruiser engines will operate satisfactorily with any major brand of unleaded gasoline that meets the following
specifications:

USA and Canada ‑ A posted pump octane rating of 87 (R+M)/2, minimum, for all models. Premium gasoline 91 (R+M)/2
octane is also acceptable for all models. Do not use leaded gasoline.

Outside USA and Canada ‑ A posted pump octane rating of 91 RON, minimum, for all models. Premium gasoline (95 RON) is
also acceptable for all models. Do not use leaded gasoline.

Using Reformulated (Oxygenated) Gasoline (USA Only)

Reformulated gasoline is required in certain areas of the USA and is acceptable for use in your Mercury Marine engine. The
only oxygenate currently in use in the USA is alcohol (ethanol, methanol, or butanol).

Gasoline Containing Alcohol

Bu16 Butanol Fuel Blends

Fuel blends of up to 16.1% butanol (Bu16) that meet the published Mercury Marine fuel rating requirements are an acceptable
substitute for unleaded gasoline. Contact your boat manufacturer for specific recommendations on your boat's fuel system
components (fuel tanks, fuel lines, and fittings).

Methanol and Ethanol Fuel Blends

IMPORTANT: The fuel system components on your Mercury Marine engine will withstand up to 10% alcohol (methanol or
ethanol) content in the gasoline. Your boat's fuel system may not be capable of withstanding the same percentage of alcohol.
Contact your boat manufacturer for specific recommendations on your boat's fuel system components (fuel tanks, fuel lines,
and fittings).

Be aware that gasoline containing methanol or ethanol may cause increased:

• Corrosion of metal parts

• Deterioration of rubber or plastic parts

• Fuel permeation through the rubber fuel lines

• Likelihood of phase separation (water and alcohol separating from the gasoline in the fuel tank)

WARNING

!

Fuel leakage is a fire or explosion hazard, which can cause serious injury or death. Periodically inspect all fuel system
components for leaks, softening, hardening, swelling, or corrosion, particularly after storage. Any sign of leakage or
deterioration requires replacement before further engine operation.

IMPORTANT: If you use gasoline that contains or might contain methanol or ethanol, you must increase the frequency of
inspection for leaks and abnormalities.
IMPORTANT: When operating a Mercury Marine engine on gasoline containing methanol or ethanol, do not store the gasoline
in the fuel tank for long periods. Cars normally consume these blended fuels before they can absorb enough moisture to cause
trouble; boats often sit idle long enough for phase separation to take place. Internal corrosion may occur during storage if
alcohol has washed protective oil films from internal components.

Engine Oil

For optimum engine performance and maximum protection, use the following oil:

Application
All MerCruiser engines Mercury/Quicksilver 25W‑40 Synthetic Blend Engine Oil, NMMA FC‑W Catalyst Compatible rated

IMPORTANT: Lubrication requirements for catalyzed engines differ from the requirements for noncatalyzed engines. Some
marine‑grade lubricants contain high levels of phosphorus. Although these high‑phosphorus lubricants may allow acceptable
engine performance, exposure over time will damage the catalyst. Catalysts damaged by lubricants containing high levels of
phosphorus may not be covered by the MerCruiser Limited Warranty.

Page 26 90-8M0113857 eng DECEMBER 2015

Recommended Oil

Section 3 - Specifications

Mercury/Quicksilver 25W-40 Synthetic Blend, NMMA FC-W Catalyst Compatible rated 4-cycle oil

Other recognized brands of NMMA FC-W Catalyst Compatible rated 4-cycle oil

SAE 20W

SAE30W

SAE40W

AIR TEMPERATURE

ORDER OF PREFERENCE

(32° F)

0° C

(50° F)

10° C

Mercury/Quicksilver 25W-40 Mineral NMMA FC-W Catalyst Compatible rated 4-cycle oil

53574

Other recognized brands of NMMA FC-W rated 4-cycle oil

If Mercury/Quicksilver 25W‑40 Synthetic Blend Engine Oil is unavailable, use the following lubricants, listed in order of
recommendation.

1. Mercury/Quicksilver 25W‑40 Mineral NMMA FC‑W Catalyst Compatible.

IMPORTANT: If you are servicing a catalyst engine, use the following oils for short periods of time only.

2. Other recognized brands of NMMA FC‑W Catalyst Compatible rated 4‑cycle oil.

3. Other recognized brands of NMMA FC‑W rated 4‑cycle oils.

4. A good‑grade, straight‑weight detergent automotive oil according to the last row of the operating chart below.

NOTE: We do not recommend nondetergent oils, multi‑viscosity oils (other than as specified), non‑FC‑W rated synthetic oils,
low‑quality oils, or oils that contain solid additives.

Use the following information for selecting the type of oil according to the order of preference.

Engine Specifications

4.3 TKS

NOTE: Performance specifications are obtained and corrected in accordance with SAE J1228/ISO 8665 Crankshaft Power.
All measurements are taken with the engine at normal operating temperature.
RPM range is measured using an accurate service tachometer with the engine at normal operating temperatures.
Oil pressure must be checked with the engine at normal operating temperature.

NOTE: Oil pressure specifications are for reference and may vary.

IMPORTANT: Do not mix spark plug types in an engine. All spark plugs should have the same part number.

Propshaft power

Displacement

Alternator amperage

RPM

Minimum oil pressure

Thermostat

Timing at idle

Firing order

Minimum battery rating

142 kW (190 hp)

4.3 L (262 cid)
Hot 72 A
Cold 65 A
WOT 4400–4800
Rev limiter 4950
Idle in neutral 650
At 2000 RPM 124 kPa (18 psi)
At idle 28 kPa (4 psi)
Seawater‑cooled models
Models with closed cooling

71° C (160° F)

10° BTDC

1‑6‑5‑4‑3‑2

375 CCA, 475 MCA, 90 Ah

90-8M0113857 eng DECEMBER 2015 Page 27

Section 3 - Specifications

Spark plug type

Spark plug gap

Emission control system

AC Platinum (AC 41‑993)
AC Platinum (AC 41‑101)

1.5 mm (0.060 in.)

Engine modification (EM)

Fluid Specifications

Engine

IMPORTANT: Your application may require more or less than the listed capacity. Use the dipstick to determine the exact
quantity of oil or fluid required. Listed capacities are approximate.

4.3 TKS Models Capacity Fluid Type

Engine oil (with filter) 3.8 L (4 US qt)

Seawater cooling system 14.1 L (15 US qt) Propylene glycol and purified water

Closed cooling system 19 L (20 US qt)

Sterndrives

NOTE: Oil capacity includes gear lube monitor.

Model
Alpha One 1892 mL (64 oz)
Bravo One 2736 mL (92‑1/2 oz)
Bravo Two 3209 mL (108‑1/2 oz)
Bravo Three (single seawater pickup) 2972 mL (100‑1/2 oz)
Bravo Three (dual seawater pickup) 2736 mL (92‑1/2 oz)

Mercury/Quicksilver 25W‑40 Synthetic Blend Engine Oil, NMMA FC‑W Catalyst
Compatible rated

Mercury Extended Life Coolant/Antifreeze or Extended Life Ethylene Glycol
5/100 Coolant/Antifreeze mixed 50/50 with purified water

Capacity Fluid Type

High Performance Gear Lubricant

Page 28 90-8M0113857 eng DECEMBER 2015

Table of Contents

Section 4 - Maintenance

Section 4 - Maintenance

Owner/Operator Responsibilities.......................................... 30

Dealer Responsibilities......................................................... 30

Maintenance......................................................................... 30

Do‑It‑Yourself Maintenance Suggestions............................. 30

Inspection............................................................................. 31

Maintenance Schedule–Sterndrive Models.......................... 31

Routine Maintenance..................................................... 31

Scheduled Maintenance................................................ 31

Sealed Carburetor Mixture Screw........................................ 32

Engine Oil............................................................................. 32

Checking ....................................................................... 33

Filling ............................................................................ 33

Changing Oil and Filter ................................................. 33

Easy Engine Oil Drain System .............................. 33

Engine Oil Drain Pump .......................................... 34

Changing Filter ...................................................... 34

Power Steering Fluid............................................................ 35

Checking ....................................................................... 35

Filling ............................................................................ 35

Changing ...................................................................... 35

Engine Coolant..................................................................... 35

Checking ....................................................................... 35

Filling ............................................................................ 36

Changing ..................................................................... 37

Alpha Sterndrive Gear Lube................................................. 37

Checking ....................................................................... 37

Filling ............................................................................ 37

Changing ...................................................................... 38

Sterndrive Gear Lube........................................................... 39

Checking........................................................................ 39

Filling............................................................................. 39

Changing....................................................................... 39

Power Trim Fluid.................................................................. 41

Checking ....................................................................... 41

Filling ............................................................................ 41

Changing ...................................................................... 41

Cleaning the Flame Arrestor................................................. 42

Positive Crankcase Ventilation (PCV) Valve ............... 42

Changing ............................................................... 42

Changing the Water‑Separating Fuel Filter.......................... 43

Lubrication............................................................................ 43

Steering System............................................................ 43

Shift Plate Control Cable Lubrication............................. 45

Driveshaft U‑joint Splines and O‑Rings (Sterndrive Unit

Removed)...................................................................... 45

Engine Coupler.............................................................. 45

Driveshaft Extension Models......................................... 46

Propellers............................................................................. 46

Propeller Repair............................................................. 46

Alpha Propeller Removal............................................... 47

Alpha Propeller Installation............................................ 47

Bravo One Propeller Removal....................................... 48

Bravo One Propeller Installation.................................... 48

Bravo Two Propeller Removal....................................... 49

Bravo Two Propeller Installation.................................... 49

Bravo Three Propeller Removal.................................... 50

Bravo Three Propeller Installation................................. 51

Serpentine Drive Belt............................................................ 52

Checking ....................................................................... 52

Replacing Belt and/or Adjusting Tension ...................... 53

Flushing the Power Package (Alpha)................................... 53

Flushing Attachments ................................................... 54

Sterndrive Water Pickups ............................................. 54

Flushing the Power Package (Bravo)................................... 55

General Information....................................................... 55

Flushing the Power Package......................................... 55

Flushing Attachments ............................................ 55

Sterndrive Water Pickups ...................................... 56

Alternative Water Pickups ..................................... 57

SeaCore Power Package Flushing Procedure.............. 58

Models Using The Sterndrive Water Pickup .......... 58

Battery.................................................................................. 61

Corrosion Protection............................................................. 61

Corrosion Information.................................................... 61

Maintaining Ground Circuit Continuity........................... 61

Sterndrive Corrosion Protection Components............... 62

MerCathode System Battery Requirements.................. 64

MerCathode Theory of Operation.................................. 64

Power Package Exterior Surfaces................................. 65

Boat Bottom Care.......................................................... 65

Painting Your Power Package....................................... 65

Sterndrive Surface Care................................................ 66

4

90-8M0113857 eng DECEMBER 2015 Page 29

Section 4 - Maintenance

Owner/Operator Responsibilities

It is the operator's responsibility to perform all safety checks, to ensure that all lubrication and maintenance instructions are
complied with for safe operation and to return the unit to an authorized Mercury MerCruiser dealer for a periodic checkup.

Normal maintenance service and replacement parts are the responsibility of the owner/operator and as such, are not
considered defects in workmanship or material within the terms of the warranty. Individual operating habits and usage
contribute to the need for maintenance service.

Proper maintenance and care of your power package will ensure optimum performance and dependability and will keep your
overall operating expenses at a minimum. See your authorized Mercury MerCruiser dealer for service aids.

Dealer Responsibilities

In general, a dealer's responsibilities to the customer include predelivery inspection and preparation such as:

• Ensure that the boat is properly equipped.

• Prior to delivery, make certain that the Mercury MerCruiser power package and other equipment are in proper operating
condition.

• Make all necessary adjustments for maximum efficiency.

• Familiarize the customer with the onboard equipment.

• Explain and demonstrate the operation of the power package and boat.

• Provide you with a copy of a Predelivery Inspection Checklist.

• Your selling dealer should fill out the Warranty Registration Card completely and mail it to the factory immediately upon
sale of the new product.

Maintenance

WARNING

!

Performing service or maintenance without first disconnecting the battery can cause product damage, personal injury, or
death due to fire, explosion, electrical shock, or unexpected engine starting. Always disconnect the battery cables from the
battery before maintaining, servicing, installing, or removing engine or drive components.

WARNING

!

Fuel vapors trapped in the engine compartment may be an irritant, cause difficulty breathing, or may ignite resulting in a fire
or explosion. Always ventilate the engine compartment before servicing the power package.

IMPORTANT: Refer to the maintenance schedule for the complete listing of all scheduled maintenance to be performed. A
repair shop or person of the owner's choosing may maintain, replace, or repair emission control devices and systems. Certain
other items should be performed only by an authorized Mercury MerCruiser dealer. Before attempting maintenance or repair
procedures not covered in this manual, we recommend that you purchase a Mercury MerCruiser service manual and read it
thoroughly.

NOTE: Maintenance points are color‑coded for ease of identification.

Maintenance Point Color Codes

Yellow Engine oil

Black Drive lube

Brown Power steering fluid

Blue Drain or flush

Do‑It‑Yourself Maintenance Suggestions

Present day marine equipment, such as your Mercury MerCruiser power package, are highly technical pieces of machinery.
Electronic ignition and special fuel delivery systems provide greater fuel economies, but also are more complex for the
untrained mechanic.

If you are one of those persons who likes to do it yourself, here are some suggestions for you.

• Do not attempt any repairs unless you are aware of the Cautions, Warnings, and procedures required. Your safety is our
concern.

• If you attempt to service the product yourself, we suggest you order the service manual for that model. The service manual
outlines the correct procedures to follow. It is written for the trained mechanic, so there may be procedures you don't
understand. Do not attempt repairs if you do not understand the procedures.

Page 30 90-8M0113857 eng DECEMBER 2015

Section 4 - Maintenance

• There are special tools and equipment that are required to perform some repairs. Do not attempt these repairs unless you

have these special tools and/or equipment. You can cause damage to the product in excess of the cost a dealer would
charge you.

• Also, if you partially disassemble an engine or drive assembly and are unable to repair it, the dealer's mechanic must

reassemble the components and test to determine the problem. This will cost you more than taking it to the dealer
immediately upon having a problem. It may be a very simple adjustment to correct the problem.

• Do not telephone the dealer, service office, or the factory to attempt for them to diagnose a problem or to request the repair

procedure. It is difficult for them to diagnose a problem over the telephone.
Your authorized dealer is there to service your power package. They have qualified factory trained mechanics.
It is recommended you have the dealer do periodic maintenance checks on your power package. Have them winterize it in the

fall and service it before the boating season. This will reduce the possibility of any problems occurring during your boating
season when you want trouble free boating pleasure.

Inspection

Inspect your power package often, and at regular intervals, to help maintain its top operating performance and correct potential
problems before they occur. The entire power package should be checked carefully, including all accessible engine parts.

• Check for loose, damaged or missing parts, hoses and clamps; tighten or replace as necessary.

• Check plug leads and electrical leads for damage.

• Remove and inspect the propeller. If badly nicked, bent, or cracked, contact your authorized Mercury MerCruiser dealer.

• Repair nicks and corrosion damage on power package exterior finish. Contact your authorized Mercury MerCruiser dealer.

Maintenance Schedule–Sterndrive Models

Routine Maintenance

NOTE: Only perform maintenance that applies to your particular power package.

New sterndrive installations may require as much as 470 mL (16 fl oz) of gear lube added to the monitor bottle during the
break‑in period (20 hours of running time). It is important to monitor and maintain the gear lube level during the break‑in period.
During the initial drive installation, air may be trapped in the top of the driveshaft housing. This void is filled from the gear lube
monitor during the sterndrive break‑in period. As the air is purged from the sterndrive through the monitor bottle, the lube level
in the bottle will drop.

Task Interval

Each day start

Each day end

Weekly

Every two months or 50

hours of operation

• Check the engine oil level. (You can extend this interval based on experience with the
product.)

• Check the sterndrive gear lube level.

• Check the trim pump oil level.

• Check the power‑assisted steering pump or the compact hydraulic steering fluid level,
depending on the steering system of your model.

• If operating in saltwater, brackish water, or polluted water, flush the seawater section of the
cooling system after each use.

• Check the water inlets for debris or marine growth.

• Check and clean the seawater strainer, if equipped.

• Check the coolant level.

• Inspect the sterndrive anodes and replace if eroded 50% or more.

• Remove the propeller and lubricate the propeller shaft and torque the nut. (If operating only in
freshwater, you can extend the interval to every four months.)

• If operating in saltwater, brackish water, or polluted water, apply Corrosion Guard to the
power package.

• Check the battery connections and the fluid level.

• Ensure that the gauges and the wiring connections are secure. Clean the gauges. (If
operating in saltwater, reduce this interval to every 25 hours or 30 days, whichever occurs
first.)

Maintenance to Be Performed

Scheduled Maintenance

NOTE: Only perform maintenance which applies to your particular power package.

90-8M0113857 eng DECEMBER 2015 Page 31

Section 4 - Maintenance

Task Interval Maintenance to Be Performed

After the initial 20‑hour

break‑in period

Every 100 hours or

annually

(whichever occurs first)

Every 300 hours or 3

years

Every 5 years

Change the engine oil and filter.

• Touch‑up the paint on the power package.

• Change the engine oil and filter.

• Change the sterndrive gear lube.

• If the condition of the spark plugs, spark plug wires, and the distributor cap and rotor was
satisfactory at the initial inspection (as listed in Every 300 hours or 3 years), inspect the
condition of these components. Replace as necessary.

• On models with closed cooling, check the coolant level and antifreeze concentration for
adequate freeze protection. Correct if necessary. Refer to the Specifications section.

• Tighten the connection of the gimbal ring to the steering shaft to specifications.

• Replace the water‑separating fuel filter.

• Check the steering system and the remote control for loose, missing, or damaged parts.
Lubricate the cables and the linkages.

• Check the continuity circuit for loose or damaged connections. Test the MerCathode unit
output if equipped.

• Clean the flame arrestor, IAC muffler, and the crankcase ventilation hoses. Inspect the PCV
valve, if equipped.

• Inspect the condition and the tension of the belts.

• Driveshaft extension models: Lubricate the driveshaft U‑joints, and tailstock input and output
bearings.

• Check the engine mounts for tightness and torque if necessary.

• Check the electrical system for loose, damaged, or corroded fasteners.

• Inspect the condition of the spark plugs, spark plug wires, and the distributor cap and rotor, if
equipped. Replace as necessary. If the condition of these components is satisfactory at
inspection, repeat inspection every 100 hours or once a year, whichever occurs first.

• Check the cooling system and the exhaust system hose clamps for tightness. Inspect both
systems for damage or leaks.

• Disassemble and inspect the seawater pump and replace worn components.

• On models with closed cooling, clean the seawater section of the closed cooling system.
Clean, inspect, and test the pressure cap.

• Inspect the exhaust system components. If the package was equipped with water shutters
(flapper valves), verify that they are not missing or worn.

• Check the engine alignment.

• Inspect the U‑joints, the splines, the bellows, and check the clamps.

• Lubricate the U‑joint splines and cross bearing, if equipped with a grease fitting.

• Inspect the gimbal bearing for roughness. Replace if necessary. See your certified Mercury
MerCruiser dealer.

• Lubricate the engine coupler.

• Replace the coolant/antifreeze. Replace every two years if not using extended‑life coolant/
antifreeze.

Sealed Carburetor Mixture Screw

IMPORTANT: Changing the mixture setting on this engine can affect the exhaust emissions level and void the emissions
certification. Do not adjust or remove the mixture settings or remove the mixture screw seals. See your authorized Mercury
dealer or emissions testing agency.

Engine Oil

NOTICE

Discharge of oil, coolant, or other engine/drive fluids into the environment is restricted by law. Use caution not to spill oil,
coolant, or other fluids into the environment when using or servicing your boat. Be aware of the local restrictions governing
the disposal or recycling of waste, and contain and dispose of fluids as required.

Page 32 90-8M0113857 eng DECEMBER 2015

Section 4 - Maintenance

Checking

1. Stop the engine. Allow approximately five minutes for the oil to drain into the oil pan. The boat must be at rest in the water.

2. Remove the dipstick. Wipe clean and reinstall fully into the dipstick tube. Wait 60 seconds to allow trapped air to vent.

NOTE: Ensure that the dipstick is installed with oil level indication marks facing the rear of the engine (flywheel end).

a - Dipstick tube

a

IMPORTANT: Add the specified engine oil to bring the level up to, but not over, the FULL or OK range mark on the
dipstick.

3. Remove the dipstick and observe the oil level. Oil level must be between the FULL or OK range and ADD. Reinstall the
dipstick into the dipstick tube.

Filling

IMPORTANT: Do not overfill the engine with oil.
IMPORTANT: Always use the dipstick to determine the exact quantity of oil or fluid required.

1. Remove the oil fill cap.

a - Oil fill cap

a

6501

IMPORTANT: Add the specified engine oil to bring the level up to, but not over, the FULL or OK range mark on the
dipstick.

2. Add the specified engine oil to bring the level up to, but not over, the FULL or OK range mark on the dipstick. Recheck the
oil level.

3. Replace the fill cap.

Engine Oil Capacity

3.8 Liter (4 US qt) Mercury/Quicksilver 25W‑40 Synthetic Blend Engine Oil, NMMA FC‑W Catalyst Compatible rated

Fluid type

Changing Oil and Filter

Refer to the Maintenance Schedule for the change interval. Engine oil should be changed before placing the boat in storage.
IMPORTANT: Change engine oil when the engine is warm from operation. Warm oil flows more freely, carrying away more

impurities. Use only recommended engine oil (refer to Specifications).

Easy Engine Oil Drain System

NOTE: Boat must be out of the water to perform this procedure.

90-8M0113857 eng DECEMBER 2015 Page 33

Section 4 - Maintenance

f

e

d

c

b

a

7284

1. Loosen the oil filter to vent the system.

a - Bilge drain plug
b - Tether
c - Clip
d - Oil drain hose plug
e - Oil drain hose
f - Bilge drain flange

2. Remove the bilge drain plug.

3. Pull the tether through the bilge drain.

4. Place the oil drain hose in a suitable container.

5. Remove the oil drain hose plug from the oil drain hose.

6. After the oil has drained completely, install the oil drain hose plug in the oil drain hose.

7. Push the hose through the bilge drain and install the bilge drain plug.

Engine Oil Drain Pump

1. Loosen the oil filter to vent the system.

2. Remove the dipstick.

3. Install the oil pump onto the dipstick tube.

a - Typical oil pump
b - Dipstick tube
c - Oil drain hose

a

c

b

mc70571-1

4. Insert the hose end of the crankcase oil pump onto an appropriate container and, using the handle, pump until the
crankcase is empty.

5. Remove the pump.

6. Install the dipstick.

Changing Filter

1. Remove and discard the oil filter.

2. Coat sealing ring on new filter with engine oil and install.

3. Tighten the oil filter securely (following filter manufacturer's instructions). Do not overtighten.

4. Remove the oil fill cap.
IMPORTANT: Always use the dipstick to determine exactly how much oil is required.

5. Add the recommended engine oil to bring the level up to the bottom of the OK range on the dipstick.

6. With the boat at rest in the water, check the oil level and add the specified fluid to bring the oil level up to, but not over, the
FULL or OK range.

Page 34 90-8M0113857 eng DECEMBER 2015

Section 4 - Maintenance

NOTE: Adding 0.95 Liter (1 US qt) of engine oil will raise the level from the ADD mark to the top of the OK range.

Engine Oil Capacity Fluid type

3.8 Liter (4 US qt) Mercury/Quicksilver 25W‑40 Synthetic Blend Engine Oil, NMMA FC‑W Catalyst Compatible rated

7. Start the engine, run the engine for three minutes, and check for leaks. Stop the engine. Allow approximately five minutes

for the oil to drain into the oil pan. The boat must be at rest in the water.

Power Steering Fluid

Checking

1. Stop the engine and center the sterndrive unit.

2. Remove the fill cap/dipstick and observe the level.

a. Proper fluid level with engine at normal operating temperature should be within the warm range.
b. Proper fluid level with engine cold should be within the cold range.

a - Power steering pump
b - Cold range
c - Warm range

b

a

c

6631

3. Fill to full line with specified fluid.
IMPORTANT: If fluid is not visible in pump, contact your authorized Mercury MerCruiser dealer.

Filling

1. Remove the fill cap/dipstick and observe the level.

2. Add Quicksilver Power Trim and Steering Fluid or Dexron III Automatic Transmission Fluid (ATF) to bring the fluid level up

to the proper level.

Tube Ref No.

114

3. Reinstall the fill cap/dipstick.

Power Trim and Steering Fluid Power steering system 92-858074K01

Description Where Used Part No.

Changing

Power steering fluid does not require changing unless it becomes contaminated with water or debris. Contact your authorized
Mercury MerCruiser dealer.

Engine Coolant

Checking

!

CAUTION

A sudden loss of pressure can cause hot coolant to boil and discharge violently resulting in serious injury from burns. Allow
the engine to cool down before removing the coolant pressure cap.

90-8M0113857 eng DECEMBER 2015 Page 35

Section 4 - Maintenance

1. Remove the cap from the heat exchanger and observe the fluid level.

a

6101

a - Heat exchanger cap

2. The coolant level in the heat exchanger should be at the bottom of the filler neck. If the coolant level is low, contact your
authorized Mercury MerCruiser dealer.

3. Install the cap onto the heat exchanger.
IMPORTANT: When reinstalling the pressure cap, be sure to tighten it until it seats on the filler neck.

4. With the engine at normal operating temperature, check the coolant level in the coolant recovery bottle.

5. The coolant level should be between the "ADD" and "FULL" marks.

6102

6. Add the specified fluid as necessary.

Tube Ref No.

122

Extended Life Antifreeze/Coolant Closed Cooling System 92-877770K1

Description Where Used Part No.

Filling

NOTICE

Using propylene glycol antifreeze in the closed cooling system can damage the cooling system or the engine. Fill the closed
cooling system with an ethylene glycol antifreeze solution suitable to the lowest temperature to which the engine will be
exposed.

NOTICE

Without sufficient cooling water, the engine, the water pump, and other components will overheat and suffer damage. Provide
a sufficient supply of water to the water inlets during operation.

NOTICE

Air trapped in the closed cooling system can cause the engine to overheat, resulting in engine damage. Minimize the
possibility of trapping air when initially filling the closed cooling system by positioning the boat so that the front of the engine
is higher than the rear of the engine.

NOTE: Add coolant only when engine is at normal operating temperature.

1. Remove the fill cap from the coolant recovery bottle.

Page 36 90-8M0113857 eng DECEMBER 2015

Section 4 - Maintenance

a

b

43458

2. Fill to the "FULL" line with the specified coolant.

Tube Ref No. Description Where Used Part No.

122

3. Install the fill cap onto the coolant recovery bottle.

Extended Life Antifreeze/Coolant Closed Cooling System 92-877770K1

Changing

Contact your authorized Mercury MerCruiser dealer.

Alpha Sterndrive Gear Lube

NOTICE

Discharge of oil, coolant, or other engine/drive fluids into the environment is restricted by law. Use caution not to spill oil,
coolant, or other fluids into the environment when using or servicing your boat. Be aware of the local restrictions governing
the disposal or recycling of waste, and contain and dispose of fluids as required.

Checking

IMPORTANT: The gear lube level fluctuates during operation. Check before starting, when the engine is cold.

1. Check the gear lube level in the monitor bottle. Keep the gear lube level within the recommended operating range.

a - Seawater cooled models
b - Closed cooling models

2. Inspect the gear lube condition. If any water is visible in the bottom of the gear lube monitor, if water appears at the fill and

drain plug hole, or if the gear lube appears discolored, these conditions can indicate a water leak in the sterndrive.

Filling

IMPORTANT: If more than 59 ml (2 fl oz) of gear lubricant is required to fill the monitor, a seal may be leaking. Damage to the
sterndrive unit may occur due to lack of lubrication. Contact your authorized Mercury MerCruiser dealer.

1. Remove the gear lube monitor cap.

2. Fill the monitor with the specified fluid so that the gear lube level is in the operating range. Do not overfill.

a - "ADD" mark
b - "OPERATING RANGE" mark

b

a

19948

Tube Ref No. Description Where Used Part No.

87

High Performance Gear Lubricant Gear lube monitor 92-858064K01

3. Ensure that the rubber gasket is inside the cap and install. Do not overtighten.

90-8M0113857 eng DECEMBER 2015 Page 37

Section 4 - Maintenance

NOTE: When filling the entire sterndrive unit refer to

Changing

.

Changing

1. Remove the gear lube monitor from the bracket.

2. Remove the gear lube monitor cap and empty the contents into a suitable container.

3. Install the gear lube monitor in the bracket.

4. Place the sterndrive unit in full trim out position, remove the oil fill and drain screw and sealing washer and drain the oil.

a - Oil fill and drain screw
b - Sealing washer

b

a

7160

5. Remove the oil vent screw and sealing washer. Allow the oil to drain completely.

a - Oil vent screw
b - Sealing washer

b

a

7161

IMPORTANT: If any water drained from the oil fill/drain hole, or if the oil appears milky, the sterndrive unit is leaking and
should be checked immediately by your authorized Mercury MerCruiser dealer.

6. Lower the sterndrive unit so that the propeller shaft is level. Fill the sterndrive unit through the oil fill and drain hole with the
specified gear lubricant until an air‑free stream of lubricant flows from the oil vent hole.

Tube Ref No.

87

IMPORTANT: Use only Mercury/Quicksilver High Performance Gear Lubricant in the sterndrive unit.

7. Install the oil vent screw and sealing washer.

8. Continue to pump gear lubricant into the drive through the oil fill and drain plug hole until gear lubricant appears in the gear
lube monitor.

9. Fill the monitor so that the gear lube level is in the operating range. Do not overfill. Ensure that the rubber gasket is inside
the cap and install. Do not overtighten.

High Performance Gear Lubricant Sterndrive unit 92-858064K01

NOTE: Oil capacity includes the gear lube monitor.

Description Where Used Part No.

Model

Alpha One 1892 ml (64 oz)

10. Remove the pump from the oil fill and drain hole. Quickly install the sealing washer and oil fill and drain screw. Tighten
securely.

Page 38 90-8M0113857 eng DECEMBER 2015

Capacity Fluid Type

High Performance Gear

Lubricant

Section 4 - Maintenance

43200

11. Recheck the oil level after the first use.
IMPORTANT: The gear lube level fluctuates during operation. Check when the engine is cold.

Sterndrive Gear Lube

Checking

NOTICE

Discharge of oil, coolant, or other engine/drive fluids into the environment is restricted by law. Use caution not to spill oil,
coolant, or other fluids into the environment when using or servicing your boat. Be aware of the local restrictions governing
the disposal or recycling of waste, and contain and dispose of fluids as required.

NOTE: The oil level fluctuates during operation. Check the oil level before starting when the engine is cold.

1. Check the gear lube oil level. Keep the oil level within the recommended operating range.

2. Inspect the lubricant condition. If any water is visible at the bottom of the gear lube monitor, if water appears at the fill and

drain plug hole, or if the gear lube appears discolored, contact your authorized Mercury MerCruiser dealer immediately.
These conditions can indicate a water leak in the sterndrive.

Gear lube monitor

Filling

New installations may require as much as 470 mL (16 fl oz) of gear lube added to the monitor bottle during the break‑in period
(20 hours of running time). It is important to monitor and maintain the gear lube level during the break‑in period.

IMPORTANT: The gear lube monitor must be checked and filled if necessary at the beginning of each day when the engine is
cold. If the gear lube alarm sounds during the day's activity, add the appropriate amount of gear lube to the monitor bottle.

NOTE: If filling the entire sterndrive, see

1. Remove the gear lube monitor cap.

2. Fill the monitor with the specified fluid until the gear lube level is in the operating range. Do not overfill.

Tube Ref No.

87

3. Replace the cap.

High Performance Gear Lubricant Gear lube monitor 92-858064K01

Description Where Used Part No.

Changing

.

Changing

1. Remove the gear lube monitor from the bracket.

2. Empty the contents into a suitable container.

3. Install the gear lube monitor in the bracket.

4. Bravo One models:

a. Remove the propeller.
b. Position the sterndrive unit to the full down position.
c. Remove the oil fill and drain screw and sealing washer.

90-8M0113857 eng DECEMBER 2015 Page 39

Section 4 - Maintenance

mc79506-1

a

b

d. Drain the fluid into a suitable container.

5. All other models:

a. Place the sterndrive unit in full trim out position.
b. Remove the oil fill and drain screw and sealing washer.
c. Drain the fluid into a suitable container.

a - Oil fill and drain screw
b - Sealing washer

a - Oil fill and drain screw
b - Sealing washer

b

a

mc79507-1

6. Remove the oil vent screw and sealing washer. Allow the oil to drain completely.

a - Oil vent screw
b - Sealing washer

b

a

mc77106-1

IMPORTANT: If any water drains from the unit, or if the fluid appears milky, the sterndrive unit is leaking. See your
authorized Mercury MerCruiser dealer.

7. Lower the sterndrive unit so the propeller shaft is level.
IMPORTANT: Use only Mercury/Quicksilver High Performance Gear Lubricant in the sterndrive unit.

8. Fill the sterndrive unit through the oil fill and drain hole with specified gear lubricant until an air‑free stream of lubricant
flows from the oil vent hole.

Tube Ref No.

87

High Performance Gear Lubricant Sterndrive unit 92-858064K01

Description Where Used Part No.

9. Install the oil vent screw and sealing washer.

10. Continue to pump gear lubricant into the drive through the oil fill and drain hole until gear lubricant appears in the gear lube
monitor.

11. Fill the monitor so that the oil level is in the operating range. Do not overfill.

12. Ensure that the rubber gasket is inside the cap and install. Do not overtighten.

Page 40 90-8M0113857 eng DECEMBER 2015

Section 4 - Maintenance

NOTE: Oil capacities include the gear lube monitor.

Model Capacity Fluid Type
Bravo One 2736 ml (92‑1/2 oz)
Bravo Two 3209 ml (108‑1/2 oz)
Bravo Three (single seawater pickup) 2972 ml (100‑1/2 oz)
Bravo Three (dual seawater pickup) 2736 ml (92‑1/2 oz)

13. Remove the pump from the oil fill and drain hole. Quickly install the sealing washer and screw. Tighten securely.

14.

Reinstall the propeller. Refer to Propellers.

15. Check the oil level after the first use.
IMPORTANT: Oil level in the gear lube monitor rises and falls during operation. Always check the oil level when the sterndrive
is cool and the engine is off.

High Performance Gear Lubricant

Power Trim Fluid

Checking

IMPORTANT: Check the oil level with the sterndrive unit in the full down/in position only.

1. Place the sterndrive unit in full down/in position.

2. Remove the fill cap from the reservoir.

a - Fill cap

a

b - Reservoir fill neck
c - "MIN" and "MAX" lines

b

c

5573

3. Observe the oil level. Level must be between the "MIN" and "MAX" lines on the reservoir.

NOTE: Fill cap is vented.

4. Fill as necessary with the specified fluid.

Tube Ref No.

114

Power Trim and Steering Fluid Power trim pump 92-858074K01

Description Where Used Part No.

Filling

1. Remove the fill cap from the reservoir.

2. Add lubricant to bring level to the bottom of the filler neck.

Tube Ref No.

114

3. Install the cap.

Power Trim and Steering Fluid Power trim pump 92-858074K01

Description Where Used Part No.

Changing

Power trim fluid does not require changing unless it becomes contaminated with water or debris. Contact your authorized
Mercury MerCruiser dealer.

90-8M0113857 eng DECEMBER 2015 Page 41

Section 4 - Maintenance

e

d

c

a

16330

b

Cleaning the Flame Arrestor

WARNING

!

Fuel is flammable and explosive. Ensure that the key switch is off and the lanyard is positioned so that the engine cannot
start. Do not smoke or allow sources of spark or open flame in the area while servicing. Keep the work area well ventilated
and avoid prolonged exposure to vapors. Always check for leaks before attempting to start the engine, and wipe up any
spilled fuel immediately.

1. Disconnect and remove the crankcase ventilation hose from the fitting on the flame arrestor and valve cover.

2. Remove the flame arrestor.

a - Locknut
b - Sealing washer
c - Typical carburetor
d - Crankcase ventilation hose
e - Flame arrestor

3. Clean the flame arrestor with warm water and a mild detergent.

4. Inspect the flame arrestor for holes, cracks, or deterioration. Replace if necessary.

5. Allow the flame arrestor to air dry completely before use.

6. Clean the crankcase ventilation hose with warm water and a mild detergent. Dry with compressed air or allow to air dry
completely.

7. Inspect the crankcase ventilation hose for cracks or deterioration. Replace if necessary.

8. Install the flame arrestor, sealing washer, and locknut. Torque the flame arrestor locknut.

Description
Flame arrestor nut 12 106

9. Connect the crankcase ventilation hose to the fitting on the flame arrestor and valve cover.

Nm lb. in. lb. ft.

Positive Crankcase Ventilation (PCV) Valve

Changing

NOTE: We recommend the use of Mercury MerCruiser replacement parts to ensure compliance with emission regulations.
NOTE: On V6 models the PCV valve is nonserviceable and is an internal component of the valve cover.

1. Remove the PCV valve from the port valve cover.

a - PCV valve
b - Hose

b

a

Page 42 90-8M0113857 eng DECEMBER 2015

mc71925-1

Section 4 - Maintenance

2. Disconnect the PCV valve from the hose and discard the valve.

3. Install a new PCV valve in the valve cover and reconnect the hose.

4. Ensure that the PCV valve is tightly seated in the valve cover.

Changing the Water‑Separating Fuel Filter

WARNING

!

Fuel is flammable and explosive. Ensure that the key switch is off and the lanyard is positioned so that the engine cannot
start. Do not smoke or allow sources of spark or open flame in the area while servicing. Keep the work area well ventilated
and avoid prolonged exposure to vapors. Always check for leaks before attempting to start the engine, and wipe up any
spilled fuel immediately.

1. Allow the engine to cool down.

NOTE: Mercury MerCruiser recommends that the engine be shut off for 12 hours prior to filter removal.

2. Close the fuel supply valve, if equipped.

3. Wrap the water‑separating fuel filter with a cloth to help catch any fuel spills or spray.

4. Remove and discard the water‑separating fuel filter and sealing ring from the mounting bracket.

5. Coat the sealing ring on the new filter with engine oil.

Tube Ref. No.

Synthetic Blend MerCruiser Engine Oil
SAE25W‑40

6. Thread the filter onto the bracket and tighten securely by hand. Do not use a filter wrench.

a

a - Fuel filter base
b - Sealing ring
c - Fuel filter

Description Where Used Part No.

Filter sealing ring 8M0078630

b

c

6527

7. Open the fuel supply valve, if equipped.

8. Ensure that the engine compartment is properly ventilated.

9. Supply cooling water to the engine.

10. Start the engine. Check for gasoline leaks around the fuel filter assembly. If leaks exist, stop the engine immediately.

Recheck the filter installation, clean spilled fuel and properly ventilate the engine compartment. If leaks continue, stop the
engine immediately and contact your authorized Mercury MerCruiser dealer.

Lubrication

Steering System

WARNING

!

Incorrect cable lubrication can cause hydraulic lock, leading to serious injury or death from loss of boat control. Completely
retract the end of the steering cable before applying lubricant.

NOTE: If the steering cable does not have a grease fitting, the inner wire of the cable cannot be greased.

90-8M0113857 eng DECEMBER 2015 Page 43

Section 4 - Maintenance

1.

If the steering cable has grease fittings: Turn the steering wheel until the steering cable is fully retracted into the cable
housing. Apply approximately three pumps of grease from a typical hand‑operated grease gun.

a - Steering cable grease fitting

a

6221

Tube Ref No. Description Where Used Part No.

Extreme Grease Steering cable grease fitting 8M0071842

2. Turn the steering wheel until the steering cable is fully extended. Lightly lubricate the exposed part of the cable.

a - Extended steering cable

a

6222

Tube Ref No. Description Where Used Part No.

Extreme Grease Steering cable 8M0071842

3. Lubricate the steering pin.

a - Steering pin

a

mc71904-1

Tube Ref No. Description Where Used Part No.

139

4. On dual engine boats: Lubricate the tie bar pivot points.

Mercury 25W-40 Synthetic Blend
4-Stroke Engine Oil

Steering pin 92-8M0078629

Page 44 90-8M0113857 eng DECEMBER 2015

Section 4 - Maintenance

abc

57220

Tube Ref No. Description Where Used Part No.

139

5. After starting the engine, turn the steering wheel several times to port and starboard to ensure that the steering system

operates properly before getting underway.

Mercury 25W-40 Synthetic Blend
4-Stroke Engine Oil

Tie bar pivot points 92-8M0078629

Shift Plate Control Cable Lubrication

Lubricate the points shown in the following illustration with oil at least once a year, more often if the product is operated in
saltwater.

Alpha shift plate shown,
Bravo shift plate similar

a - Remote control shift

cable

b - Shift assist assembly
c - Intermediate shift cable

Driveshaft U‑joint Splines and O‑Rings (Sterndrive Unit Removed)

1. Apply grease to the driveshaft U‑joint splines and O‑rings.

b

a - Driveshaft U‑joint splines
b - O‑rings (3)

a

8591

Tube Ref No. Description Where Used Part No.

Extreme Grease Driveshaft U-joint splines and O-rings 8M0071842

2.

For propeller shaft lubrication, refer to Propellers.

Engine Coupler

Lubricate the engine coupler splines through the grease fittings on the coupler by applying approximately 8–10 pumps of
grease from a typical hand‑operated grease gun.

90-8M0113857 eng DECEMBER 2015 Page 45

Section 4 - Maintenance

a

b

a

c

17014

NOTE: If the boat is operated at idle for prolonged periods of time, the coupler should be lubricated every 50 hours.

a - Grease fitting

a

Tube Ref No. Description Where Used Part No.

Extreme Grease Coupler 8M0071842

6213

NOTE: Your power package is equipped with a sealed engine coupler and Perm‑a‑Lube U‑joints. The sealed coupler and shaft
splines can be lubricated without removing the sterndrive unit. The Perm‑a‑Lube U‑joints do not require lubrication.

Driveshaft Extension Models

1. Lubricate the transom end grease fitting and engine end grease fitting by applying approximately 10–12 pumps of grease
from a typical hand‑operated grease gun.

2. Lubricate the driveshaft grease fittings by applying approximately 3–4 pumps of grease from a typical hand‑operated
grease gun.

a - Driveshaft grease fittings
b - Transom end grease fitting
c - Engine end grease fitting

Tube Ref No. Description Where Used Part No.

Extreme Grease

Transom end grease fitting, engine end grease fitting, driveshaft grease

fittings

8M0071842

Propellers

Propeller Repair

Some damaged propellers can be repaired. Contact your authorized Mercury MerCruiser dealer.

Page 46 90-8M0113857 eng DECEMBER 2015

Section 4 - Maintenance

Alpha Propeller Removal

WARNING

!

Rotating propellers can cause serious injury or death. Never operate the boat out of the water with a propeller installed.
Before installing or removing a propeller, place the drive unit in neutral and engage the lanyard stop switch to prevent the
engine from starting. Place a block of wood between the propeller blade and the anti‑ventilation plate.

1. Place a wood block between the propeller blade and the anti‑ventilation plate to prevent rotation. Straighten bent tabs on

tab washer.

2. Turn the propeller shaft nut counterclockwise to remove the nut.

3. Slide the tab washer, drive sleeve, propeller, and thrust hub off the propeller shaft.

Alpha Propeller Installation

NOTICE

Operating the engine with a loose propeller can damage the propeller, the drive, or drive components. Always tighten the
propeller nut or nuts to specification and check for tightness periodically and at the required maintenance interval.

IMPORTANT: If reusing the tab washer, carefully inspect tabs for cracks or other damage. Replace the tab washer if condition
is questionable.

a - Propeller shaft

d

e

b - Thrust hub
c - Flo‑Torq II drive hub
d - Propeller
e - Drive sleeve
f - Locking tab washer
g - Propeller nut

f

a

b

c

6215

g

1. Apply a liberal coat of one of the following lubricants to the propeller shaft.

Tube Ref No.

95

2. Slide the thrust hub onto the propeller shaft, with the stepped side toward the propeller hub.

3. Install the Flo‑Torq II drive hub into the propeller.

2-4-C with PTFE Propeller shaft 92-802859A 1

Extreme Grease Propeller shaft 8M0071842

NOTE: The drive sleeve is tapered and will slide fully into the propeller as the nut is tightened and properly torqued.

4. Align the splines and place the propeller on the propeller shaft.

5. Install the drive sleeve and locking tab washer.

6. Install and tighten the propeller nut to the specified torque.

Description
Propeller nut (minimum) 136 – 100

7. Bend three tabs on the tab washer down into the grooves in the spline washer. After the first use, bend the three tabs

straight and retorque the propeller nut. Bend tabs back down into the spline washer. Check the propeller every 20 hours of
operation. Do not operate with a loose propeller.

Description Where Used Part No.

Nm lb‑in. lb‑ft

90-8M0113857 eng DECEMBER 2015 Page 47

Section 4 - Maintenance

a

b

c

d

e

g

f

5301

a

b

c

d

e

4750

Bravo One Propeller Removal

WARNING

!

Rotating propellers can cause serious injury or death. Never operate the boat out of the water with a propeller installed.
Before installing or removing a propeller, place the drive unit in neutral and engage the lanyard stop switch to prevent the
engine from starting. Place a block of wood between the propeller blade and the anti‑ventilation plate.

1. Place a wood block between the propeller blade and the anti‑ventilation plate to prevent rotation. Straighten bent tabs on
tab washer.

2. Turn the propeller shaft nut counterclockwise to remove the nut.

3. Slide the tab washer, drive sleeve, propeller, and thrust hub off the propeller shaft.

Bravo One Propeller Installation

IMPORTANT: The selected propeller's rotation must match the forward gear direction of propeller shaft rotation.

1. Liberally lubricate the propeller shaft spline with one of the following Quicksilver lubricants.

Tube Ref No. Description Where Used Part No.

95

NOTE: Extreme Grease is for saltwater applications only.

2. Install the propeller with the attaching hardware as shown.

3. Tighten the propeller nut to the specified torque.

2-4-C with PTFE Propeller shaft splines 92-802859A 1

Extreme Grease Propeller shaft splines (saltwater only) 8M0071842

Typical Bravo One models

a - Propeller shaft splines
b - Forward thrust hub
c - Flo‑Torque II drive hub
d - Propeller
e - Drive sleeve adapter
f - Tab washer
g - Propeller nut

NOTE: The specified torque is a minimum torque value.

Description

Bravo One propeller nut

4.

Models equipped with the tab washer: Continue to tighten the propeller nut until the three tabs on the tab washer align
with the grooves on the spline washer.

5. Bend the three tabs down into the grooves.

Propeller

a ­b - Tab washer
c - Drive sleeve adapter
d - Tab bent down
e - Propeller nut

Nm lb‑in. lb ft
136 – 100

Then align tabs with grooves

Page 48 90-8M0113857 eng DECEMBER 2015

Section 4 - Maintenance

a

b

c

d

e

4750

Bravo Two Propeller Removal

WARNING

!

Rotating propellers can cause serious injury or death. Never operate the boat out of the water with a propeller installed.
Before installing or removing a propeller, place the drive unit in neutral and engage the lanyard stop switch to prevent the
engine from starting. Place a block of wood between the propeller blade and the anti‑ventilation plate.

1. Place a wood block between the propeller blade and anti‑ventilation plate to prevent rotation. Straighten bent tabs on tab
washer.

2. Turn propeller shaft nut counterclockwise to remove nut.

3. Slide tab washer, spline washer, propeller, and thrust hub off propeller shaft.

Bravo Two Propeller Installation

IMPORTANT: The selected propeller's rotation must match the forward gear direction of propeller shaft rotation.

1. Liberally coat the propeller shaft spline with one of the following Quicksilver lubricants.

Tube Ref No. Description Where Used Part No.

95

NOTE: Extreme Grease is for saltwater applications only.

2. Install the propeller with the attaching hardware as shown.

3. Tighten the propeller nut to the specified torque.

2-4-C with PTFE Propeller shaft splines 92-802859A 1

Extreme Grease Propeller shaft splines (saltwater only) 8M0071842

c

d

f

a

b

8566

e

NOTE: The torque stated is a minimum torque value.

Description

Bravo Two propeller nut

4. Continue to tighten the propeller nut until the three tabs on the tab washer align with the grooves on the spline washer.

5. Bend the three tabs down into the grooves.

a - Propeller
b - Tab washer
c - Drive sleeve adapter
d - Tab bent down
e - Propeller nut

Bravo Two

a - Propeller shaft splines
b - Forward thrust hub
c - Propeller
d - Spline washer
e - Tab washer
f - Propeller nut

Nm lb‑in. lb ft

81 – 60

Then align tabs with grooves

90-8M0113857 eng DECEMBER 2015 Page 49

Section 4 - Maintenance

Bravo Three Propeller Removal

WARNING

!

Rotating propellers can cause serious injury or death. Never operate the boat out of the water with a propeller installed.
Before installing or removing a propeller, place the drive unit in neutral and engage the lanyard stop switch to prevent the
engine from starting. Place a block of wood between the propeller blade and the anti‑ventilation plate.

1. Place a wood block between the propeller blades and the anti‑ventilation plate to prevent rotation.

2. Remove the bolt and washers securing the propeller shaft anode.

3. Remove the propeller shaft anode.

a - Propeller
b - Rear propeller nut
c - Propeller shaft anode
d - Propeller shaft anode screw
e - Flat washer

b

f - Star washer

a

c

d

f

e

5303

4. Turn the rear propeller nut 37 mm (1‑7/16 in.) counterclockwise to remove the nut.

5. Slide the propeller and thrust hub off the propeller shaft.

6. Turn the front propeller nut 70 mm (2‑3/4 in.) counterclockwise to remove the nut.

7. Slide the propeller and thrust hub off the propeller shaft.

NOTE: Some damaged propellers can be repaired. Contact your authorized Mercury MerCruiser dealer.

e

f

b

d

c

a

i

j

g

h

5304

a - Rear propeller nut
b - Rear propeller
c - Rear propeller thrust hub
d - Front propeller nut
e - Front propeller
f - Front propeller thrust hub
g - Propeller shaft anode screw
h - Flat washer
i - Star washer
j - Propeller shaft anode

Page 50 90-8M0113857 eng DECEMBER 2015

Section 4 - Maintenance

Bravo Three Propeller Installation

NOTICE

Operating the engine with a loose propeller can damage the propeller, the drive, or drive components. Always tighten the
propeller nut or nuts to specification and check for tightness periodically and at the required maintenance interval.

e

f

b

d

c

a

i

j

g

h

5304

1. Slide the front propeller thrust hub onto the propeller shaft with the outside taper facing toward the propeller hub (toward
end of propeller shaft).

2. Apply a liberal amount of one of the following lubricants to the propeller shaft.

Tube Ref No.

Extreme Grease Propeller shaft 8M0071842

95

3. Align the splines and install the front propeller onto the propeller shaft.

4. Install the front propeller nut and tighten to the specified torque. Check the propeller every 20 hours of operation and
tighten to the specified torque as needed.

2-4-C with PTFE Propeller shaft 92-802859A 1

Description Where Used Part No.

a - Rear propeller nut
b - Rear propeller
c - Rear propeller thrust hub
d - Front propeller nut
e - Front propeller
f - Front propeller thrust hub
g - Propeller shaft anode screw
h - Flat washer
i - Star washer
j - Propeller shaft anode

Description
Front propeller nut 136 – 100

5. Slide the rear thrust hub onto the propeller shaft with the outside taper facing toward the propeller hub (toward end of
propeller shaft).

6. Align the splines and install the rear propeller onto the propeller shaft.

7. Install the rear propeller nut and tighten to the specified torque. Check the propeller every 20 hours of operation and tighten
to the specified torque as needed.

Description
Rear propeller nut 81 – 60

8. Install the propeller shaft anode over the rear propeller nut.

9. Place the flat washer onto the propeller shaft anode screw.

10. Place the star washer onto the propeller shaft anode screw.

Nm lb‑in. lb‑ft

Nm lb‑in. lb‑ft

90-8M0113857 eng DECEMBER 2015 Page 51

Section 4 - Maintenance

11. Apply Loctite 271 Threadlocker onto the propeller shaft anode screw threads.

a - Propeller
b - Rear propeller nut
c - Propeller shaft anode
d - Propeller shaft anode screw
e - Flat washer

b

f - Star washer

a

c

d

f

e

Tube Ref No. Description Where Used Part No.

7

12. Secure the propeller shaft anode to the propeller shaft with the propeller shaft anode screw and washers. Tighten the
anode screw to the specified torque.

Loctite 271 Threadlocker Propeller shaft anode screw threads 92-809819

5303

Description
Propeller shaft anode screw 38 mm (0.3125‑18 x 1.5 in.) long 27 – 20

Nm lb‑in. lb‑ft

Serpentine Drive Belt

WARNING

!

Inspecting the belts with the engine running may cause serious injury or death. Turn off the engine and remove the ignition
key before adjusting tension or inspecting belts.

d

b

a

d

b

a

f

c

e

6116

a

6117

c

f

With a seawater pump Without a seawater pump

a - Idler pulley
b - Water circulating pump pulley
c - Crankshaft pulley
d - Alternator pulley
e - Seawater pump pulley
f - Power steering pump pulley

Checking

Inspect the drive belt for proper tension and for the following:

• Excessive wear

Page 52 90-8M0113857 eng DECEMBER 2015

Section 4 - Maintenance

COLOR GUIDE

for

PATENT

2.83918

NEWTONE

NEWTONE

b

a

14980

• Cracks

NOTE: Minor, transverse cracks (across the belt width) may be acceptable. Longitudinal cracks (in the direction of belt
length) that join transverse cracks are not acceptable.

• Fraying

• Glazed surfaces

• Proper tension ‑ 13 mm (1/2 in.) deflection, with moderate thumb pressure, on the belt at the location that has the longest
distance between two pulleys.

mc75130-1

Replacing Belt and/or Adjusting Tension

IMPORTANT: If a belt is to be reused, it should be installed in the same direction of rotation as before.

NOTE: Belt deflection is to be measured on the belt at the location that has the longest distance between two pulleys.

1. Loosen the 16 mm (5/8 in.) locking nut on the adjustment stud.

2. Turn the adjustment stud and loosen the belt.

3. If a new serpentine drive belt is required, remove the old belt and install a new belt onto the pulleys.

4. Put a wrench on the adjustment stud 16 mm (5/8 in.) locking nut.

5. Use a 8 mm (5/16 in.) socket and tighten the adjusting stud to adjust the belt deflection.

6. Use one of the two following methods to check for correct deflection.

a. Push down with moderate thumb pressure on the longest stretch of belt. Proper deflection is 13 mm (1/2 in.).
b. Attach the Kent Moore© belt tension gauge to the belt. The gauge has different ranges for new and used belts.

a - Kent Moore belt tension gauge
b - Serpentine belt

7. While holding the adjustment stud at the correct belt tension, tighten the 16 mm (5/8 in.) locking nut.

a - 8 mm (5/16 in.) adjusting stud
b - 16 mm (5/8 in.) locking nut

a

b

6119

8. Operate the engine for a short period of time and recheck the belt adjustment.

Flushing the Power Package (Alpha)

Your boat comes equipped with through the sterndrive water pickups. See Sterndrive Water Pickups (following) for the
flushing procedure. Consult your authorized Mercury MerCruiser dealer for further explanation.

90-8M0113857 eng DECEMBER 2015 Page 53

Section 4 - Maintenance

9192

IMPORTANT: Alpha engines with the sterndrive water inlet blocked off at the gimbal housing, and using a through‑the‑hull
water inlet, need a supply of cooling water available to both the sterndrive and to the engine during operation

Flushing Attachments

Flushing Device 91‑44357Q 2

Attaches to the water intakes; provides a fresh water connection when flushing the cooling system or
operating the engine.

Sterndrive Water Pickups

This Mercury MerCruiser sterndrive is equipped with side water pickups. Side pickups require the flushing attachment (44357Q

2).

5773

Side pickup

NOTE: Flushing is needed only for salty, brackish, mineral‑laden, or polluted water applications. Flushing is recommended after
each outing for best results.

NOTICE

Flushing the engine with the boat in the water can cause seawater to flow into the engine, resulting in engine damage. Close
the seacock before flushing the engine. Keep the seacock closed until starting the engine.

1. On seawater cooled models: proceed to Step 5. or Step 6.

NOTE: Closed cooling models are equipped with a heat exchanger on the side of the engine.

2. If flushing the cooling system with the boat in the water:
a. Raise the sterndrive to trailer position.
b. Install the appropriate flushing attachment over the water inlet holes in the gear housing.
c. Lower sterndrive to full down/in position.

3. If flushing the cooling system with the boat out of the water:
a. Lower sterndrive to full down/in position.

WARNING

!

Rotating propellers can cause serious injury or death. Never operate the boat out of the water with a propeller installed.
Before installing or removing a propeller, place the drive unit in neutral and engage the lanyard stop switch to prevent the
engine from starting. Place a block of wood between the propeller blade and the anti‑ventilation plate.

b. Remove propeller.

Page 54 90-8M0113857 eng DECEMBER 2015

Section 4 - Maintenance

a

b

c

21514

21515

a

b

c. Install the appropriate flushing attachment over the water inlet holes in the gear housing.

4. Connect the hose between the flushing attachment and the water source.

5. With the sterndrive in normal operating position, open the water source completely.

6. Place the remote control in the neutral idle speed position and start the engine.

NOTICE

Operating the engine out of the water at high speeds creates suction, which can collapse the water supply hose and overheat
the engine. Do not operate the engine above 1400 RPM out of the water and without sufficient cooling water supply.

7. Depress the throttle only button and slowly advance the throttle until the engine reaches 1300 RPM (± 100 RPM).

8. Observe the water temperature gauge to ensure that the engine is operating in the normal range.

9. Operate engine with sterndrive in neutral for about 10 minutes or until discharge water is clear.

10. Slowly return the throttle to the idle speed position.

11. Stop the engine.

12. Shut off the water and remove flushing attachment.

13. This step is only required if the boat is to be stored in the water. After the flush procedure is completed, remove the
seawater inlet hose from the thermostat housing and plug the hose to prevent water from siphoning into the boat. This
prevents seawater from contaminating the engine flush.

14. Tag the ignition switch with an appropriate tag requiring the seawater inlet hose to be reconnected prior to operating
engine.

Flushing the Power Package (Bravo)

General Information

Your authorized Mercury MerCruiser dealer can explain how to properly flush your power package.

Flushing the Power Package

The boat can be equipped with a combination of any of three different types of water pickups: through‑the‑hull,
through‑the‑transom, and through‑the‑sterndrive. The flushing procedures for these systems are separated into two categories:
sterndrive water pickups and alternative water pickups.

IMPORTANT: Engines that require dual water pickups require a through‑the‑hull or through‑the‑transom pickup in addition to
the sterndrive water inlets.
IMPORTANT: Engines with the sterndrive water inlet blocked off at the gimbal housing and using a through‑the‑hull or
through‑the‑transom pickup need a supply of cooling water available to both the sterndrive and to the engine during operation.

Flushing Attachments

Flushing attachments for dual water pickup

a - Flushing device
b - Hose attachment
c - Dual water pickup flush gearcase seal kit

90-8M0113857 eng DECEMBER 2015 Page 55

Flushing attachments for side water pickup

Section 4 - Maintenance

9192

9194

Flushing Device 91‑44357Q 2

Attaches to the water intakes; provides a fresh water connection when flushing the cooling system or
operating the engine.

Dual Water Pick‑up Flush Gearcase Seal Kit 91‑881150K 1

Blocks off the front water inlet holes on the dual water inlet gearcases.

Sterndrive Water Pickups

There are two types of water pickups available on Mercury MerCruiser sterndrives: dual water, and side water pickups. Dual
water pickups require the flushing attachment (44357Q 2) and the flush seal kit (881150K 1), and side water pickups require
the flushing attachment (44357Q 2).

5752

Dual water pickup

5773

Side water pickup

NOTE: Flushing is needed only for salty, brackish, mineral‑laden, or polluted water applications. Flushing is recommended after
each outing for best results.

NOTICE

Flushing the engine with the boat in the water can cause seawater to flow into the engine, resulting in engine damage. Close
the seacock before flushing the engine. Keep the seacock closed until starting the engine.

1.

On models with the sterndrive seawater inlet blocked, supply water to the sterndrive and to the engine. See Alternative
Water Pickups.

2. On models using the sterndrive seawater inlet and a through‑the‑hull or through‑the‑transom alternative water pickup,
supply water to only the sterndrive by taking the following steps to block, or disconnect and block, the hose from the
alternative seawater pickup pump inlet Y‑fitting.

a. If equipped with a seacock, close the seacock in the hose from the alternative water pickup.
b. If not equipped with a seacock, disconnect the hose from the alternative water pickup and plug both ends.
c.

If there is not a hose running to the transom, refer to Alternative Water Pickups.

Page 56 90-8M0113857 eng DECEMBER 2015

Section 4 - Maintenance

3. On models using the sterndrive water pickups for water supply: proceed to Step 4. or Step 5.

4. If flushing the cooling system with the boat in the water:

a. Raise sterndrive to trailer position.
b. Install the appropriate flushing attachment over the water inlet holes in the gear housing.
c. Lower sterndrive to full down (in) position.

5. If flushing the cooling system with the boat out of the water:

a. Lower sterndrive to full down (in) position.

WARNING

!

Rotating propellers can cause serious injury or death. Never operate the boat out of the water with a propeller installed.
Before installing or removing a propeller, place the drive unit in neutral and engage the lanyard stop switch to prevent the
engine from starting. Place a block of wood between the propeller blade and the anti‑ventilation plate.

b. Remove propeller.
c. Install the appropriate flushing attachment over the water inlet holes in the gear housing.

6. Connect the hose between the flushing attachment and the water source.

7. With the sterndrive in a normal operating position, open the water source fully.

8. Place the remote control in the neutral idle speed position and start the engine.

NOTICE

Operating the engine out of the water at high speeds creates suction, which can collapse the water supply hose and overheat
the engine. Do not operate the engine above 1400 RPM out of the water and without sufficient cooling water supply.

9. Depress the throttle only button and slowly advance the throttle until the engine reaches 1300 RPM (± 100 RPM).

10. Observe the water temperature gauge to ensure that the engine is operating in the normal range.

11. Operate engine with sterndrive in neutral for about 10 minutes or until discharge water is clear.

12. Slowly return the throttle to the idle speed position.

13. Stop the engine.

14. Shut off the water and remove flushing attachment.

15. Remove the seawater inlet hose from the seawater pump and plug the hose to prevent water from siphoning into the

engine.

16. Tag the ignition switch with an appropriate tag requiring the seawater inlet hose to be reconnected prior to operating

engine.

Alternative Water Pickups

IMPORTANT: Two water sources are needed for this procedure.

NOTE: Flushing is needed only for salty, brackish, mineral‑laden, or polluted water applications. Flushing is recommended after
each outing for best results.

IMPORTANT: Models with the sterndrive water inlet blocked off at the gimbal housing and using a through‑the‑hull water inlet
need a supply of cooling water available to both the sterndrive and to the engine during operation.

1. If flushing the cooling system with the boat in the water:

a. Raise sterndrive to trailer position.
b. Install the appropriate flushing attachment over the water inlet holes in the gear housing.
c. Lower sterndrive unit to full down (in) position.

2. If flushing the cooling system with the boat out of the water:

a. Lower sterndrive to full down (in) position.

WARNING

!

Rotating propellers can cause serious injury or death. Never operate the boat out of the water with a propeller installed.
Before installing or removing a propeller, place the drive unit in neutral and engage the lanyard stop switch to prevent the
engine from starting. Place a block of wood between the propeller blade and the anti‑ventilation plate.

b. Remove propeller.
c. Install the appropriate flushing attachment over the water inlet holes in the gear housing.

3. Connect the hose between the flushing attachment and the water source.

4. Close the seacock, if equipped, to prevent water from siphoning into the engine or boat.

90-8M0113857 eng DECEMBER 2015 Page 57

Section 4 - Maintenance

33208

5. Remove the seawater inlet hose from the seawater pump at the location shown. Plug the hose to prevent water from
siphoning into the engine or boat.

Seawater inlet hose connection

6. Using a suitable adapter, connect the flushing hose from the water source to the water inlet of the seawater pump.

NOTICE

Without sufficient cooling water, the engine, the water pump, and other components will overheat and suffer damage. Provide
a sufficient supply of water to the water inlets during operation.

7. With the sterndrive in a normal operating position, open the water source fully.

8. Place the remote control in the neutral idle speed position and start the engine.

NOTICE

Operating the engine out of the water at high speeds creates suction, which can collapse the water supply hose and overheat
the engine. Do not operate the engine above 1400 RPM out of the water and without sufficient cooling water supply.

9. Slowly advance the throttle until the engine reaches 1300 RPM (±100 RPM).

10. Observe the water temperature gauge to ensure that the engine is operating in the normal range.

11. Operate engine with sterndrive in neutral for about 10 minutes or until discharge water is clear.

12. Slowly return the throttle to the idle speed position.

13. Stop the engine.

14. Shut off the water and remove flushing attachments.

15. If the boat is out of the water, install the water inlet hose to the aft side of the seawater pump. Tighten the hose clamp
securely.

16. If the boat is in the water, tag the ignition switch with an appropriate tag requiring the seawater inlet hose to be
reconnected prior to operating engine.

SeaCore Power Package Flushing Procedure

NOTE: Flushing is needed only for salty, brackish, mineral‑laden, or polluted water applications. Flushing is recommended after
each outing for best results.

IMPORTANT: Flushing the SeaCore power package with the boat and sterndrive in the water is less effective. Flushing the
SeaCore power package is most effective when performed with the boat and sterndrive out of the water, such as on a boat lift
or trailer.

Models Using The Sterndrive Water Pickup

IMPORTANT: The system is designed to flush the Bravo sterndrive and the engine with one water source. Do not block or
remove the inlet water hose from the sterndrive to the engine.

NOTE: Engines with the sterndrive water inlet blocked off at the gimbal housing: Refer to

WARNING

!

Rotating propellers can cause serious injury or death. Never operate the boat out of the water with a propeller installed.
Before installing or removing a propeller, place the drive unit in neutral and engage the lanyard stop switch to prevent the
engine from starting. Place a block of wood between the propeller blade and the anti‑ventilation plate.

Page 58 90-8M0113857 eng DECEMBER 2015

Alternative Water Pickups

.

Section 4 - Maintenance

a

c

b

d

18510

18487

a

b

a

b

c

18489

IMPORTANT: Do not allow the engine to pull air or seawater from alternative water pickup sources during the flushing
procedure. If equipped, ensure that all alternative water inlet hoses are plugged at both ends.

1. Remove the boat from the water.

2. Close the seacock, if equipped.

For visual clarity, the seacock shown is not installed

a - Hose fitting to engine
b - Seacock
c - Handle (closed position)
d - To water source pickup attachment

3. If equipped with an alternative water pickup and not equipped with a seacock, disconnect the water hose from the
alternative water pickup and plug both ends, excluding the Bravo sterndrive.

4. Ensure that the inlet water hose from the sterndrive to the engine is connected.

5. Remove the quick‑connect fitting from the parts bag supplied with the engine.

6. Attach the quick‑connect fitting to a water hose.

a - Quick‑connect fitting (water hose end)
b - Water hose

7. Snap the quick‑connect fitting with the water hose into the flush socket on the engine.

a - Water hose
b - Quick‑connect fitting (water hose end)
c - Flush socket

8. Open the water source of the water hose to a full flow.

9. Allow the water to flush the sterndrive for 30 seconds.

10. Place the remote control in neutral idle speed position and start engine.

90-8M0113857 eng DECEMBER 2015 Page 59

Without sufficient cooling water, the engine, the water pump, and other components will overheat and suffer damage. Provide
a sufficient supply of water to the water inlets during operation.

11. Operate the engine at idle speed in neutral gear. Do not exceed 1200 RPM.

NOTICE

Section 4 - Maintenance

b

a

18487

a

b

25900

a

12. Monitor the engine temperature while operating the engine.

13. Flush the engine for 5–10 minutes or until discharge water is clear.

14. Shut off the engine.

15. Allow the water to flush the sterndrive for 10 seconds.

16. Turn off the water source.

17. Disconnect the quick‑connect fitting and water hose from the flush socket on the engine by pressing the release button on
the flush socket.

a - Quick‑connect fitting (water hose end)
b - Flush socket release button

18. Remove the quick‑connect fitting from the water hose.

a - Quick‑connect fitting (water hose end)
b - Water hose

19. Retain the quick‑connect fitting with the water hose end for repeated use by storing it separately in a storage compartment
on the boat for easy access.
IMPORTANT: Do not store the quick‑connect fitting in the flush socket on the engine. Doing so would allow the seawater
pump to suck air during engine operation causing an overheating problem. Damages due to engine overheating are not
covered by Mercury MerCruiser Warranty.

Quick-connect fitting stored in the boat

a - Quick‑connect fitting (water hose end)

Page 60 90-8M0113857 eng DECEMBER 2015

Section 4 - Maintenance

a

b

18490

20. Insert the dust cover in the flush socket on the engine.

Dust cover installed in the flush socket

a - Dust cover
b - Flush socket

IMPORTANT: If the unit is to be stored in the water, the seacock should remain closed until time of usage. If unit is to be
stored out of the water, open the seacock.

21. Open the seacock, if equipped, or reconnect the alternative water inlet source prior to operating the engine.

Battery

Refer to specific instructions and warnings accompanying your battery. If this information is not available, observe the following
precautions when handling a battery.

WARNING

!

Recharging a weak battery in the boat, or using jumper cables and a booster battery to start the engine, can cause serious
injury or product damage from fire or explosion. Remove the battery from the boat and recharge in a ventilated area away
from sparks or flames.

WARNING

!

An operating or charging battery produces gas that can ignite and explode, spraying out sulfuric acid, which can cause
severe burns. Ventilate the area around the battery and wear protective equipment when handling or servicing batteries.

Corrosion Protection

Corrosion Information

Whenever two or more dissimilar metals are submerged in a conductive solution, such as saltwater, polluted water or water
with a high mineral content, a chemical reaction takes place causing electrical current to flow between metals. The electrical
current flow causes the metal that is most chemically active, or anodic, to erode. This is known as galvanic corrosion. For more
information contact your authorized Mercury MerCruiser dealer.

Maintaining Ground Circuit Continuity

The transom assembly and sterndrive are equipped with a ground wire circuit to ensure good electrical continuity between the
engine, transom assembly, and sterndrive components. Good continuity is essential for the MerCathode System to function
effectively.

90-8M0113857 eng DECEMBER 2015 Page 61

Section 4 - Maintenance

a

c

d

e

b

35214

f

f

a

a

c

c

d

d

e

e

b

b

35213

Sterndrive Corrosion Protection Components

To help control the effects of galvanic corrosion, sterndrives come with several sacrificial anodes and other corrosion protection
devices. For a more comprehensive explanation of corrosion and corrosion protection, refer to the Marine Corrosion
Protection Guide.

Typical single sterndrive

a - Anode (Alpha models), MerCathode (Bravo models)
b - Ventilation plate anode
c - Trim cylinder anodes
d - Bearing carrier anodes
e - Gearcase anodic plate
f - Anode kit on hull (if equipped)

Dual sterndrive

a - Anode (Alpha models), MerCathode (Bravo models)
b - Ventilation plate anode
c - Trim cylinder anodes
d - Bearing carrier anodes
e - Gearcase anodic plate
f - Anode kit on hull (if equipped)

NOTICE

Washing the MerCathode assembly can damage components and lead to rapid corrosion. Do not use any cleaning
equipment such as brushes or high‑pressure washers to clean the MerCathode assembly.

Page 62 90-8M0113857 eng DECEMBER 2015

Section 4 - Maintenance

22405

53380

55028

a

c

b

Do not pressure‑wash the MerCathode assembly, if equipped. Doing so will damage the coating on the reference electrode
wire and decrease the corrosion protection.

MerCathode mounted to the underside of the
gimbal housing, if equipped

a - MerCathode reference electrode, if

equipped

b - Do not paint
c - Do not pressure wash

IMPORTANT: Replace sacrificial anodes if eroded 50% or more.
The following sacrificial anodes are installed at different locations on your power package. These anodes help protect against

galvanic corrosion by sacrificing its metal to be slowly eroded instead of the metal components on the power package.
MerCathode system—The electrode assembly, if equipped, replaces the anode block. The system should be monitored to

ensure adequate output. After the boat has been moored for a minimum of eight hours, inspect the MerCathode control module
LED for a visual indication on the state of protection. Refer to MerCathode Theory of Operation.

Description

Alpha sterndrive

gearcase anodic plate

Alpha sterndrive

gimbal housing anode

Bravo sterndrive

gearcase anode plate

Location Figure

Mounted on the underside of the lower gearcase.

Mounted on the underside of the gimbal housing.

Mounted on the underside of the lower gearcase.

20336

Alpha and Bravo sterndrive

ventilation plate anode

Mounted on the front of the gearcase.

20338

90-8M0113857 eng DECEMBER 2015 Page 63

Section 4 - Maintenance

Description Location Figure

Alpha and Bravo sterndrive

trim cylinder anodes

Alpha and Bravo sterndrive

bearing carrier anode

Mounted on each of the trim cylinders.

Located in front of the propeller, between the front
side of the propeller and the gear housing.

Propshaft anode (Bravo Three) Located behind the aft propeller.

The MerCathode electrode, if equipped, is mounted
to the underside of the gimbal housing. The

MerCathode System

MerCathode controller is mounted on the engine or
on the boat transom. The controller harness
connects to the electrode harness.

20342

20343

20344

20340

Anode kit (if equipped) Mounted to the boat transom.

20341

In addition to the corrosion protection devices, take the following steps to inhibit corrosion:

1. Paint the power package.

2. Annually spray the power package components on the inside of the boat with Corrosion Guard to protect the finish from
dulling and corrosion. You may also spray external power package components.

3. Keep all lubrication points, especially the steering system, shift, and throttle linkages, well lubricated.

4. Flush the cooling system periodically, preferably after each use.

MerCathode System Battery Requirements

The Mercury MerCruiser MerCathode system requires a minimum battery charge of 12.6 volts at all times to maintain
functionality.

Boats equipped with a MerCathode system that use shore power, and are not run for a long period of time, must use a battery
charger to maintain a minimum battery charge of 12.6 volts or above.

Boats equipped with a MerCathode system that do not have access to shore power must be operated often enough to maintain
a minimum battery charge of 12.6 volts or above at all times.

MerCathode Theory of Operation

The MerCathode system provides corrosion protection by impressing a reverse blocking current that stops the destructive flow
of galvanic currents. The MerCathode controller will regulate output to maintain 0.94 volts at the reference electrode.

A constant LED indicates that the system is operating correctly. A flashing LED indicates that a fault has occurred, or that an
abnormal condition exists.

Page 64 90-8M0113857 eng DECEMBER 2015

Section 4 - Maintenance

IMPORTANT: When a boat or new drive is first put into service the LED may initially indicate that the protective current is not
being supplied through the MerCathode anode. This condition is normal, and, in such cases, the LED may flash for a period.
The light from the LED will become steady after the boat is moored for a period of eight hours without operation.

MerCathode LED Codes

MerCathode LED Definition Required Action

On (no flash)

2 flashes per second

1 flash every 4 seconds

1 long flash every 10
seconds

2 long flashes every 10
seconds

1 long flash every 60
seconds

LED not on

No fault. The controller is
working properly.

Reference voltage is below

0.84 V.

Reference voltage is above

1.04 V.
Shorted or open reference

terminal.
Shorted or open anode

terminal.

Open anode and reference
terminals, or the boat is out of
the water/dry docked.

Controller is not operating or
is faulty.

No action is necessary. This is the normal LED indication for a
properly functioning MerCathode system.

This may be normal. Monitor the LED over time. If the flashing
continues, contact your local Mercury Service dealer for
assistance.

Contact your local Mercury Service dealer for assistance.

Contact your local Mercury Service dealer for assistance.

Contact your local Mercury Service dealer for assistance.

• If the boat is out of the water, no action is necessary; this is a
normal LED flash sequence.

• If the boat is in the water, contact your local Mercury Service
dealer for assistance.

• Check the battery voltage; it must be 12.6 V or higher.

• Check the 5‑amp fuse in the controller wire harness.

• If further assistance is required, contact your local Mercury
Service dealer.

Power Package Exterior Surfaces

1. Spray the entire power package at recommended intervals with Corrosion Guard. Follow the instructions on the can for
proper application.

Tube Ref No.

120

2. Clean the entire power package. External surfaces that have become bare should be repainted with the recommended
primer and spray paint at recommended intervals.

Description
Mercury Light Gray Primer
Mercury Phantom Black 92‑802878Q 1

Corrosion Guard Painted surfaces 92-802878 55

Description Where Used Part No.

Part Number

Painted surfaces

92‑802878 52

Boat Bottom Care

To achieve maximum performance and fuel economy, the boat bottom must be kept clean. Accumulation of marine growth or
other foreign matter can greatly reduce boat speed and increase fuel consumption. To ensure best performance and efficiency,
periodically clean the boat bottom in accordance with manufacturer's recommendations.

In some areas, it may be advisable to paint the bottom to help prevent marine growth. Refer to the following information for
special notes about the use of antifouling paints.

Painting Your Power Package

IMPORTANT: Corrosion damage that results from the improper application of antifouling paint will not be covered by the limited
warranty.

1.

Painting the boat hull or transom: you may apply antifouling paint to the boat hull and transom. However, observe the
following:
IMPORTANT: Do not paint anodes or MerCathode System reference electrode and anode. Paint will render them
ineffective as inhibitors of galvanic corrosion.
IMPORTANT: If antifouling protection is required for the boat hull or transom, you can use copper‑based or tin‑based
paints where not prohibited by law. If using copper‑based or tin‑based antifouling paints, observe the following:

90-8M0113857 eng DECEMBER 2015 Page 65

Section 4 - Maintenance

21083

a

b

c

d

e

f

g

• Avoid any electrical interconnection between the paint and the Mercury MerCruiser product, anodic blocks, or
MerCathode system by allowing a minimum of 40 mm (1.5 in.) unpainted area on the transom of the boat around
these items.

b

2.

Painting the sterndrive unit or transom assembly: The sterndrive unit and transom assembly should be painted with a
good‑quality marine paint or an antifouling paint that does not contain copper, tin, or any other material that could conduct
electrical current. Do not paint drain holes, anodes, MerCathode system, or items specified by the boat manufacturer.

a - Painted boat transom
b - Unpainted area on transom

a

5578

NOTICE

Washing the MerCathode assembly can damage components and lead to rapid corrosion. Do not use any cleaning
equipment such as brushes or high‑pressure washers to clean the MerCathode assembly.

3. Do not power‑wash a sterndrive that has a MerCathode assembly. Doing so can damage the coating on the reference wire
of the MerCathode assembly and increase corrosion.

Sterndrive Surface Care

Standard Bravo sterndrive

a - Sacrificial trim cylinder anode
b - Sacrificial anodic plate
c - Steering lever ground wire
d - Ground wire between the gimbal ring and bell housing
e - Stainless steel hoses
f - Ground wire between the gimbal housing and trim cylinder
g - Ground wire between the gimbal ring and gimbal housing

We recommend the following maintenance items to help keep your sterndrive corrosion‑free:

• Maintain a complete paint covering on the sterndrive.

• Check the finish regularly. Prime and paint nicks and scratches using Mercury enamel paint and touch up paint. Use only
tin‑based antifouling paint or its equivalent on or near aluminum surfaces below the waterline.

• If bare metal is showing, apply two coats of paint.

Page 66 90-8M0113857 eng DECEMBER 2015

Description
Mercury Phantom Black Bare metal 92‑ 802878‑1

Where used Part number

Section 4 - Maintenance

• Spray all electrical connections with sealant.

Tube Ref No. Description Where Used Part No.

25

• Inspect the sacrificial trim tab or anode plate if equipped, at regular intervals and replace it before it is half gone. If a

stainless steel propeller is installed, additional anodes or a MerCathode system will be required.

• Inspect the propeller shaft for fishing line, which can cause corrosion on a stainless steel shaft.

• Remove the propeller at least every 60 days and lubricate the propeller shaft.

• Do not use lubricants containing graphite on or near the aluminum in saltwater.

• Do not paint trim tabs or the mounting surface.

Liquid Neoprene All electrical connections 92- 25711 3

90-8M0113857 eng DECEMBER 2015 Page 67

Section 4 - Maintenance

Notes:

Page 68 90-8M0113857 eng DECEMBER 2015

Table of Contents

Section 5 - Storage

Section 5 - Storage

Cold Weather or Extended Storage...................................... 70

Reformulated (Oxygenated) Gasolines (U.S.A. Only)... 70

Fuel Containing Alcohol................................................. 70

Preparing Power Package for Storage—Carburetor

Models........................................................................... 71

Engine and Fuel System Preparation .................... 71

Draining the Seawater System............................................. 72

Drain System Identification............................................ 72

Air Actuated Single‑Point Drain System ................ 72

Manual Single‑Point Drain System, Seawater cooled

models .................................................................. 73

4.3 ECT Single‑Point Drain System with Plug ....... 73

Three‑Point Manual Drain System, Seawater cooled

.............................................................................. 73

Multipoint Drain (MPD) System ............................. 74

Air Actuated Single‑Point Drain System........................ 74

Boat in the Water ................................................... 74

Boat Out of the Water ............................................ 76

Manual Single‑Point Drain System (Alpha)................... 78

Boat in the Water ................................................... 78

Boat Out of the Water ............................................ 79

Three‑Point Manual Drain System—Seawater Cooled

....................................................................................... 81

Boat in the Water ................................................... 81

Boat Out of the Water ............................................ 81

Draining Water from the Gen III Cool Fuel Module........82

Draining the Sterndrive......................................................... 82

Battery Storage..................................................................... 83

Recommissioning the Power Package................................. 83

5

90-8M0113857 eng DECEMBER 2015 Page 69

Section 5 - Storage

Cold Weather or Extended Storage

Reformulated (Oxygenated) Gasolines (U.S.A. Only)

This type of gasoline is required throughout most of the U.S.A. There are two types of oxygenates used in fuels: alcohol
(ethanol) or ether (MTBE or ETBE). Gasoline containing ethanol is especially subject to absorbing atmospheric moisture,
forming gums or solids, or it may separate into a layer of fuel floating on top of a layer of water and alcohol. To reduce the
potential for separation, storage should be in containers that prevent oxidation or water vapors mixing. If ethanol is used in the
gasoline in your area, refer to Fuel Containing Alcohol.

Fuels for your Mercury Marine engine may contain up to 10% of ethanol or ether.

Fuel Containing Alcohol

Fuels containing either methanol (methyl alcohol) or ethanol (ethyl alcohol) may cause certain adverse effects. These adverse
effects are more severe with methanol. Increasing the percentage of alcohol in the fuel can also worsen these adverse effects.

Some of these adverse effects are caused because the alcohol in the gasoline can absorb moisture from the air, resulting in a
separation (phase) of the water/alcohol from the gasoline in the fuel tank.

The fuel system components on your Mercury Marine engine will withstand up to 10% alcohol content in the gasoline. We do
not know what percentage your boat's fuel system will withstand. Contact your boat manufacturer for specific recommendations
on the boat's fuel system components (fuel tanks, fuel lines, and fittings). Be aware that gasolines containing alcohol may
cause increased:

• Corrosion of metal parts

• Deterioration of rubber or plastic parts

• Fuel permeation through rubber fuel lines

• Starting and operating difficulties

WARNING

!

Fuel leakage is a fire or explosion hazard, which can cause serious injury or death. Periodically inspect all fuel system
components for leaks, softening, hardening, swelling, or corrosion, particularly after storage. Any sign of leakage or
deterioration requires replacement before further engine operation.

Because of possible adverse effects of alcohol in gasoline, only alcohol‑free gasoline should be used. If only fuel containing
alcohol is available, or if the presence of alcohol is unknown, increased inspection frequency for leaks and abnormalities is
required.

IMPORTANT: When operating a Mercury Marine engine on gasoline containing alcohol, storage of gasoline in the fuel tank for
long periods should be avoided. Long periods of storage, common to boats, create unique problems. In cars, alcohol‑blend
fuels normally are consumed before they can absorb enough moisture to cause problems. Conversely, boats may not be used
for days, weeks, or months, long enough for phase separation to take place. In addition, internal corrosion may take place
during storage if alcohol has washed protective oil films from internal components.

IMPORTANT: Mercury MerCruiser strongly recommends that this service should be performed by an authorized Mercury
MerCruiser dealer. Damage caused by freezing temperatures is not covered by the Mercury MerCruiser Limited Warranty.

NOTICE

Water trapped in the seawater section of the cooling system can cause corrosion or freeze damage. Drain the seawater
section of the cooling system immediately after operation or before any length of storage in freezing temperatures. If the boat
is in the water, keep the seacock closed until restarting the engine to prevent water from flowing back into the cooling system.
If the boat is not fitted with a seacock, leave the water inlet hose disconnected and plugged.

NOTE: As a precautionary measure, attach a tag to the key switch or steering wheel of the boat reminding the operator to open
the seacock or unplug and reconnect the water inlet hose before starting the engine.

IMPORTANT: Mercury MerCruiser requires that propylene glycol antifreeze, mixed to the manufacturer's instructions, be used
in the seawater section of the cooling system for freezing temperatures or extended storage. Ensure that the propylene glycol
antifreeze contains a rust inhibitor and is recommended for use in marine engines. Be certain to follow the propylene glycol
manufacturer's recommendations.

Page 70 90-8M0113857 eng DECEMBER 2015

Section 5 - Storage

Preparing Power Package for Storage—Carburetor Models

Engine and Fuel System Preparation

WARNING

!

Fuel is flammable and explosive. Ensure that the key switch is off and the lanyard is positioned so that the engine cannot
start. Do not smoke or allow sources of spark or open flame in the area while servicing. Keep the work area well ventilated
and avoid prolonged exposure to vapors. Always check for leaks before attempting to start the engine, and wipe up any
spilled fuel immediately.

WARNING

!

Fuel vapors trapped in the engine compartment may be an irritant, cause difficulty breathing, or may ignite resulting in a fire
or explosion. Always ventilate the engine compartment before servicing the power package.

1.

Check the antifreeze concentration where applicable. Refer to the Specifications section.

2. Before adding Mercury Quickstor Fuel Stabilizer to the fuel in the tank, determine the type of fuel that is in the fuel tanks
and proceed with the following:

a. Vessels using fuel without alcohol—fill the vessel fuel tanks with fresh gasoline that does not contain alcohol and add

a sufficient amount of Mercury Quickstor Fuel Stabilizer to treat the gasoline. Follow the instructions on the container.

b. Vessels using fuel containing alcohol—drain the fuel tanks as low as possible and add a sufficient amount of Mercury

Quickstor Fuel Stabilizer to treat the remaining gasoline. Follow the instructions on the container.

3. Remove the hardware securing the flame arrestor assembly. Do not remove the flame arrestor until after the engine is
running. This will prevent the exposure of backfire flames.

4.

Flush the cooling system. Refer to the Maintenance section.

5.

Supply cooling water to the engine. Refer to the Maintenance section.

6. Start the engine.

7. Run the engine at 1300 RPM for five minutes. This is usually enough time for the engine to reach a normal operating
temperature and for the treated gasoline to circulate through the fuel system.

8. Close the fuel shut off valve, if equipped, or disconnect and plug the boat fuel tank hose.

9. While running the engine at 1300 RPM, fog the induction system and combustion chambers by spraying approximately
227 g (8 oz) of Mercury/Quicksilver Storage Seal Rust Inhibitor into carburetor bores.

10. Spray the remaining 57 g (2 oz) of Storage Seal Rust Inhibitor rapidly into the carburetor as the engine begins to stall from
lack of fuel. Allow the engine to stop. Turn the ignition off.

Tube Ref No.

119

Storage Seal Rust Inhibitor Carburetor 92-858081K03

Description Where Used Part No.

11. Install the flame arrestor assembly.

12. Change the oil and oil filter.

13. Replace the water separating fuel filter element where applicable.

14. Connect the fuel hose if disconnected and open the fuel shut off valve, if equipped.

15.

Drain the engine seawater cooling system. Refer to Draining the Seawater System.

NOTICE

Water trapped in the seawater section of the cooling system can cause corrosion or freeze damage. Drain the seawater
section of the cooling system immediately after operation or before any length of storage in freezing temperatures. If the boat
is in the water, keep the seacock closed until restarting the engine to prevent water from flowing back into the cooling system.
If the boat is not fitted with a seacock, leave the water inlet hose disconnected and plugged.

16. Fill the seawater cooling system with propylene glycol mixed to the manufacturer's recommendation to protect the engine
to the lowest temperature to which it will be exposed during freezing temperatures or extended storage. This will also
prevent the formation of exfoliating rust in the cooling system passages.

17. Store the battery according to the manufacturer's instructions.

90-8M0113857 eng DECEMBER 2015 Page 71

Section 5 - Storage

33144

a

b

c

d

a

c

b

43766

Draining the Seawater System

!

CAUTION

Water can enter the bilge when the drain system is open, damaging the engine or causing the boat to sink. Remove the boat
from the water or close the seacock, disconnect and plug the seawater inlet hose, and ensure the bilge pump is operational
before draining. Do not operate the engine with the drain system open.

IMPORTANT: Only drain the seawater section of the closed cooling system.
IMPORTANT: The boat must be as level as possible to ensure complete draining of the cooling system.

Your power package is equipped with a drain system. Refer to Drain System Identification to determine which instructions
apply to your power package.

IMPORTANT: The engine must not be operating at any point during the draining procedure.
IMPORTANT: Mercury MerCruiser requires that propylene glycol antifreeze, mixed to the manufacturer's instructions, be used
in the seawater section of the cooling system for freezing temperatures or extended storage. Ensure that the propylene glycol
antifreeze contains a rust inhibitor and is recommended for use in marine engines. Be certain to follow the propylene glycol
manufacturer's recommendations.

Drain System Identification

NOTE: All drain plugs are fitted with blue wing nuts.

Air Actuated Single-Point Drain System

NOTE: The blue air pump is mounted on the engine on V8 models, but is stored off the engine on V6 models. Ask your dealer
for the location.

Closed cooling models (V8 shown)

a - Blue drain plug location
b - Blue air pump
c - Air manifold
d - Green indicators

Seawater cooled models—Non-catalyst shown, catalyzed

similar

a - Blue drain plug location
b - Air manifold
c - Green indicators

Page 72 90-8M0113857 eng DECEMBER 2015

Manual Single-Point Drain System, Seawater cooled models

45951

a

b

Non-ECT shown, ECT similar

a - Blue handle
b - Blue drain plug location

4.3 ECT Single-Point Drain System with Plug

Section 5 - Storage

b

6128

Three-Point Manual Drain System, Seawater cooled

a

Blue drain plug

Note two plugs on
seawater pump

a - Blue drain plug

a

6126

90-8M0113857 eng DECEMBER 2015 Page 73

Section 5 - Storage

33155

Multipoint Drain (MPD) System

b

10226

M110050

93235672

a - Side of cylinder block

(port and starboard)

b - Bottom of exhaust

manifolds (port and
starboard)

b

a

a

6129

Fuel cooler to thermostat housing

a - Check valve (if equipped)

a

6131

Air Actuated Single‑Point Drain System

Boat in the Water

NOTE: This procedure is written for the air pump that is included with the engine. However, any air source can be used.

1. Close the seacock (if equipped) or remove and plug the water inlet hose.

2. Remove the blue air pump from the engine.

3. Ensure that the lever on top of the pump is flush with the handle (horizontal).

4. Install the air pump on the actuator fitting.

Page 74 90-8M0113857 eng DECEMBER 2015

5. Pull the lever on the air pump (vertical) to lock the pump onto the fitting.

33144

a

b

c

d

a

c

b

43766

Section 5 - Storage

c

a

b

6. Pump air into the system until both green indicators extend and water drains from both sides of the engine. The port side

will begin draining before the starboard side.

7. Immediately remove the blue drain plug from the side of the thermostat housing or the heat exchanger. This must be

removed within 30 seconds to properly vent the cooling system.

e

a - Actuator fitting
b - Green indicators
c - Manual release valve
d - Blue air pump
e - Lever (locking)

d

8293

Closed cooling models (V8 model shown)

a - Blue drain plug location
b - Blue air pump
c - Air manifold
d - Green indicators

Seawater cooled models

a - Blue drain plug location
b - Air manifold
c - Green indicators

90-8M0113857 eng DECEMBER 2015 Page 75

Section 5 - Storage

a

b

6133

8.

Verify that water is draining from each opening. If not, use the Three‑Point Manual Drain System instructions.

a - Port side drain location
b - Starboard side drain location (two blue

plugs)

9. Allow the system to drain for a minimum of ten minutes. Pump air as necessary to keep the green indicators extended.

10. Crank the engine over slightly with the starter motor to purge any water trapped in the seawater pump. Do not allow the
engine to start.

11. Reinstall the blue drain plug in the thermostat housing or heat exchanger.

12. Remove the air pump from the air manifold and return it to the mounting bracket.

13. Mercury MerCruiser recommends leaving the drain system open while transporting the boat or while performing other
maintenance. This helps ensure that all water is drained.

14. Before launching the boat, pull up on the manual release valve. Verify that the green indicators are no longer extended.

a - Green indicators

a

6135

15. Open the seacock, if equipped, or unplug and reconnect the water inlet hose prior to operating the engine.

Boat Out of the Water

NOTE: This procedure is written for the air pump that is attached to the engine. However, any air source can be used.

1. Place the boat on a level surface to ensure complete draining of the system.

2. Remove the blue air pump from the engine.

3. Ensure that the lever on top of the pump is flush with the handle (horizontal).

4. Install the air pump on the actuator fitting.

Page 76 90-8M0113857 eng DECEMBER 2015

5. Pull the lever on the air pump (vertical) to lock the pump onto the fitting.

33144

a

b

c

d

a

c

b

43766

Section 5 - Storage

c

a

b

6. Pump air into the system until both green indicators extend and water drains from both sides of the engine. The port side

will begin draining before the starboard side.

e

a - Actuator fitting
b - Green indicators
c - Manual release valve
d - Blue air pump
e - Lever (locking)

d

8293

Closed cooling models

a - Blue drain plug location
b - Blue air pump
c - Air manifold
d - Green indicators

Seawater cooled models—Non-catalyst

a - Blue drain plug location
b - Air manifold
c - Green indicators

90-8M0113857 eng DECEMBER 2015 Page 77

Section 5 - Storage

45951

a

b

6133

7.

Verify that water is draining from each opening. If not, use the Three Point Manual Drain System instructions.

a - Port side drain location
b - Starboard side drain location

8. Allow the system to drain for a minimum of ten minutes. Pump air as necessary to keep the green indicators extended.

9. Crank the engine over slightly with the starter motor to purge any water trapped in the seawater pump. Do not allow the
engine to start.

10. Remove the air pump from the air manifold and return it to the mounting bracket.

11. Mercury MerCruiser recommends leaving the drain system open while transporting the boat or while performing other
maintenance. This helps ensure that all water is drained.

12. Before launching the boat, pull up on the manual release valve. Verify that the green indicators are no longer extended.

a - Green indicators

a

6135

Manual Single‑Point Drain System (Alpha)

Boat in the Water

1. Close the seacock (if equipped) or remove and plug the water inlet hose.

a.

4.3 MPI ECT—Remove the blue plug at the distribution housing at the lower front right corner of the engine.

4.3 MPI ECT

Page 78 90-8M0113857 eng DECEMBER 2015

Section 5 - Storage

46068

a

b

33152

b.

5.0 MPI ECT—Rotate the blue handle counterclockwise until it stops (approximately two turns). The red on the
handle shaft indicates that the drain system is open. Do not force the handle as this will create new threads.

2.

4.3 MPI ECT and 5.0 MPI ECT—Immediately remove the blue drain plug from the side of the thermostat housing. This
must be removed within 30 seconds to properly vent the cooling system.

a - Blue handle
b - Blue drain plug location, V8 location

b

a

6136

Blue drain plug, V6 location

3. Visually verify that water is draining. On the 5.0 MPI ECT, if water does not drain, remove the blue drain plug from the

distribution housing and drain manually.

5.0 MPI ECT

a - Blue drain plug
b - Drain location ‑ orange or red

4. Allow the system to drain for a minimum of ten minutes. We recommend leaving the drain system open while transporting
the boat or performing other maintenance.

5. Reinstall the blue drain plug in the thermostat housing.

6. Close the drain system by rotating the blue handle clockwise until it stops or install the blue drain plug. The handle is fully
seated when no red is visible. Do not overtighten the handle, as this action will create new threads.

7. Open the seacock (if equipped) or unplug and reconnect the water inlet hose before operating the engine.

Boat Out of the Water

1. Place the boat on a level surface to ensure complete draining of the system.

90-8M0113857 eng DECEMBER 2015 Page 79

Section 5 - Storage

45951

a

b

33152

•

4.3 MPI ECT—Remove the blue plug at the distribution housing at the lower front right corner of the engine.

•

5.0 MPI ECT—Rotate the blue handle counterclockwise until it stops (approximately two turns). The red on the
handle shaft indicates that the drain system is open. Do not force the handle as this will create new threads.

2.

4.3 MPI ECT and 5.0 MPI ECT—Immediately remove the blue drain plug from the side of the thermostat housing. This

must be removed within 30 seconds to properly vent the cooling system.

4.3 MPI ECT

a - Blue handle
b - Blue drain plug location

b

a

6136

3. Visually verify that water is draining. On the 5.0 MPI ECT, if water does not drain, remove the blue drain plug from the
distribution housing and drain manually.

5.0 MPI ECT

a - Blue drain plug
b - Drain location ‑ orange or red

4. Allow the system to drain for a minimum of ten minutes. We recommend leaving the drain system open while transporting
the boat or performing other maintenance.

5. Reinstall the blue drain plug in the thermostat housing.

6. Close the drain system by installing the blue drain plug or rotating the blue handle clockwise until it stops. The handle is
fully seated when no red is visible. Do not overtighten the handle, as this action will create new threads.

Page 80 90-8M0113857 eng DECEMBER 2015

Section 5 - Storage

46068

Three‑Point Manual Drain System—Seawater Cooled

Boat in the Water

NOTE: Use this procedure if your engine is not equipped with an air actuated single‑point drain system or if the air actuated
single‑point drain system fails.

1. Close the seacock (if equipped) or remove and plug the water inlet hose.

2. Remove the blue drain plug from the distribution housing (lower front, port side).

a - Blue drain plug

a

6138

3. To properly vent the cooling system, remove the blue drain plug from the side of the non‑catalyst thermostat housing within

30 seconds.

Blue drain plug

4. Remove the two blue drain plugs from the seawater pickup pump (front, starboard side).

a - Two blue drain plugs, starboard side

a

5. Verify that water is draining from each opening.

6. Allow the system to drain for a minimum of five minutes. We recommend leaving the drain system open while transporting

the boat or performing other maintenance to ensure that all water is drained.

7. Crank the engine over slightly with the starter motor to purge any water trapped in the seawater pickup pump. Do not allow

the engine to start.

8. Before launching the boat or starting the engine, close the drain system by installing the four blue drain plugs.

9. Open the seacock, if equipped, or unplug and reconnect the water inlet hose prior to operating the engine.

6140

Boat Out of the Water

NOTE: Use this procedure if your engine is not equipped with an air actuated single‑point drain system or if the single‑point
drain system fails.

90-8M0113857 eng DECEMBER 2015 Page 81

Section 5 - Storage

43648

a

b

cdc

1. Place the boat on a level surface to ensure complete draining of the system.

2. Remove three blue drain plugs: one from the distribution housing (lower front, port side) and two from the seawater pickup
pump (front, starboard side).

a

a - Blue drain plug

3. Verify that water is draining from each opening.

4. Allow the system to drain for a minimum of five minutes. We recommend leaving the drain system open while transporting
the boat or performing other maintenance to ensure that all water is drained.

5. Crank the engine over slightly with the starter motor to purge any water trapped in the seawater pickup pump. Do not allow
the engine to start.

6. Before launching the boat or starting the engine, close the drain system by installing the three blue drain plugs.

a

6142

Draining Water from the Gen III Cool Fuel Module

Mercury MerCruiser recommends draining the Gen III Cool Fuel Module if it is equipped with a drain plug.

1. Remove the drain plug from the Gen III Cool Fuel Module and allow the water to completely drain from the module.

2. Inspect the drain plug and the O‑ring for damage. Replace if needed.

3. Place the O‑ring on the drain plug and install the drain plug in the module drain hole. Tighten the drain plug to finger‑tight.

a - Gen III Cool Fuel Module
b - Fuel in‑line fitting
c - Drain plug
d - O‑ring

Draining the Sterndrive

NOTE: This procedure is needed only for salty, brackish, mineral‑laden, or polluted water applications; and for freezing
temperatures or extended storage.

Page 82 90-8M0113857 eng DECEMBER 2015

Section 5 - Storage

1. Insert a small wire repeatedly to make sure that vent holes, water drain holes, and passages are unobstructed and open.

e

b

d

a

f

c

6146

Sterndrive water drain holes

a - Speedometer pitot tube
b - Trim tab cavity vent hole
c - Trim tab cavity drain passage
d - Gear housing water drain hole (one each at port and starboard)
e - Gear housing cavity vent hole
f - Gear housing cavity drain hole

NOTICE

The universal joint bellows may develop a set when stored in a raised or up position, causing the bellows to fail when
returned to service and allowing water to enter the boat. Store the sterndrive in the full down position.

2. Lower the sterndrive to the full down/in position.

3. For additional assurance against freezing and rust, after draining, fill the cooling system with propylene glycol mixed to the

manufacturer's recommendation to protect the engine to the lowest temperature to which it will be exposed during freezing
temperatures or extended storage

Battery Storage

Whenever the battery will be stored for an extended period of time, be sure the cells are full of water and the battery is fully
charged and in good operating condition. It should be clean and free of leaks. Follow the battery manufacturer's instructions for
storage.

Recommissioning the Power Package

1. Ensure that all cooling system hoses are connected properly and hose clamps are tight.

!

CAUTION

Disconnecting or connecting the battery cables in the incorrect order can cause injury from electrical shock or can damage
the electrical system. Always disconnect the negative (‑) battery cable first and connect it last.

2. Install a fully charged battery. Clean the battery cable clamps and terminals and reconnect the cables. Tighten each cable

clamp securely when connecting.

3. Coat the terminal connections with a battery terminal anticorrosion agent.

4.

Perform all the checks in the Operation Chart.

NOTICE

Without sufficient cooling water, the engine, the water pump, and other components will overheat and suffer damage. Provide
a sufficient supply of water to the water inlets during operation.

5. Start the engine and closely observe instrumentation to ensure that all systems are functioning correctly.

6. Carefully inspect the engine for fuel, oil, fluid, water, and exhaust leaks.

7. Inspect the steering system, shift and throttle control for proper operation.

90-8M0113857 eng DECEMBER 2015 Page 83

Section 5 - Storage

Notes:

Page 84 90-8M0113857 eng DECEMBER 2015

Table of Contents

Section 6 - Troubleshooting

Section 6 - Troubleshooting

Starter Motor Will Not Crank Engine, or Cranks Slow.......... 86

Engine Will Not Start or Is Hard to Start............................... 86

Engine Runs Rough, Misses, or Backfires........................... 86

Poor Performance................................................................ 86

Excessive Engine Temperature............................................ 87

Insufficient Engine Temperature........................................... 87

Low Engine Oil Pressure...................................................... 87

Battery Will Not Recharge.................................................... 87

Remote Control Is Difficult to Move, Has Excessive Play, or

Makes Unusual Sounds........................................................ 87

Steering Wheel Jerks or Is Difficult to Turn.......................... 88

Power Trim Does Not Operate (Motor Does Not Operate)... 88
Power Trim Does Not Operate (Motor Operates but

Sterndrive Unit Does Not Move)........................................... 88

6

90-8M0113857 eng DECEMBER 2015 Page 85

Section 6 - Troubleshooting

Starter Motor Will Not Crank Engine, or Cranks Slow

Possible Cause Remedy
Battery switch turned off. Turn the switch on.
Remote control not in the neutral position. Position the control lever in neutral.
Open circuit breaker or blown fuse. Check and reset the circuit breaker or replace fuse.
Loose or dirty electrical connections or damaged

wiring.
Bad battery or low battery voltage. Test the battery and charge if necessary; replace if bad.
Lanyard stop switch activated. Check the lanyard stop switch.

Check all electrical connections and wires (especially battery cables).
Clean and tighten all faulty connections.

Engine Will Not Start or Is Hard to Start

Possible Cause
Lanyard stop switch activated. Check the lanyard stop switch.
Improper starting procedure. Read the starting procedure.
Insufficient fuel supply. Fill fuel tank or open valve.

Turn the key switch off and wait five minutes. Push the throttle only button, push

Engine flooded.

Faulty ignition system component. Service the ignition system.
Clogged fuel filter. Replace fuel filter.
Stale or contaminated fuel. Drain fuel tank. Fill with fresh fuel.

Fuel line or tank vent line kinked or clogged.

Faulty wire connections. Check wire connections.
TKS fuse blown. Check TKS fuse. Replace the fuse if blown.

the remote control handle/throttle lever to the 1/4 throttle position, and attempt to
restart.

Replace kinked lines or blow out lines with compressed air to remove
obstruction.

Engine Runs Rough, Misses, or Backfires

Possible Cause Remedy

Clogged fuel filter. Replace filter.
Stale or contaminated fuel. Drain fuel tank. Fill with fresh fuel.

Kinked or clogged fuel line or fuel tank vent line.

Flame arrestor dirty. Clean flame arrestor.
Faulty ignition system component. Service ignition system.

Replace kinked lines or blow out lines with compressed air to remove
obstruction.

Remedy

Poor Performance

Possible Cause
Throttle not fully open. Inspect the throttle cable and linkages for proper operation.
Damaged or improper propeller. Replace the propeller.
Excessive bilge water. Drain and check for cause of entry.
Boat overloaded or load improperly distributed. Reduce load or redistribute load more evenly.
Flame arrestor dirty. Clean the flame arrestor.
Boat bottom fouled or damaged. Clean or repair as necessary.
Ignition problem.
Engine overheating.
Running rich. Have authorized Mercury MerCruiser dealer check and repair.

Page 86 90-8M0113857 eng DECEMBER 2015

See Engine Runs Rough, Misses, or Backfires.
See Excessive Engine Temperature.

Remedy

Section 6 - Troubleshooting

Excessive Engine Temperature

Possible Cause Remedy
Water inlet or seacock closed. Open.
Drive belt loose or in poor condition. Replace or adjust belt.
Seawater pickups or sea strainer obstructed. Remove obstruction.
Faulty thermostat. Replace.

Coolant level (if equipped) low in closed cooling section.

Heat exchanger or fluid cooler plugged with foreign material.

Loss of pressure in closed cooling section. Check for leaks. Clean, inspect, and test pressure cap.
Faulty seawater pickup pump. Repair.
Seawater discharge restricted or plugged. Clean exhaust elbows.

Check for cause of low coolant level and repair. Fill system with
proper coolant solution.

Clean heat exchanger, engine oil cooler, and transmission oil
cooler (if equipped).

Insufficient Engine Temperature

Possible Cause

Faulty thermostat. Replace.

Remedy

Low Engine Oil Pressure

Possible Cause
Insufficient oil in crankcase. Check and add oil.
Excessive oil in crankcase (causing it to

become aerated).

Diluted or improper viscosity oil.

Check and remove required amount of oil. Check for cause of excessive oil
(improper filling).

Change oil and oil filter, using correct grade and viscosity oil. Determine
cause for dilution (excessive idling).

Remedy

Battery Will Not Recharge

Possible Cause
Excessive current draw from battery. Turn off nonessential accessories.
Alternator drive belt loose or in poor condition. Replace and/or adjust.
Unacceptable battery condition. Test battery, replace if necessary.

Loose or dirty electrical connections or damaged
wiring.

Faulty alternator. Test alternator output, replace if necessary.

Check all associated electrical connections and wires (especially
battery cables). Clean and tighten faulty connections. Repair or
replace damaged wiring.

Remedy

Remote Control Is Difficult to Move, Has Excessive Play, or Makes Unusual Sounds

Possible Cause

Insufficient lubrication on shift and throttle linkage
fasteners.

Obstruction in shift or throttle linkages. Remove obstruction.

Loose or missing shift and throttle linkages.

Shift or throttle cable kinked.

90-8M0113857 eng DECEMBER 2015 Page 87

Lubricate.

Check all linkages. If any are loose or missing, see authorized
Mercury MerCruiser dealer immediately.

Straighten cable or have authorized Mercury MerCruiser dealer
replace cable if damaged beyond repair.

Remedy

Section 6 - Troubleshooting

Steering Wheel Jerks or Is Difficult to Turn

Possible Cause Remedy
Low power steering pump fluid level. Check for leak. Refill system with fluid.
Drive belt loose or in poor condition. Replace and/or adjust.
Insufficient lubrication on steering components. Lubricate.

Loose or missing steering fasteners or parts.

Contaminated power steering fluid. See authorized Mercury MerCruiser dealer.

Check all parts and fasteners. If any are loose or missing, see authorized
Mercury MerCruiser dealer immediately.

Power Trim Does Not Operate (Motor Does Not Operate)

Possible Cause

Blown fuse.

Loose or dirty electrical
connections or damaged
wiring.

Replace fuse. Fuses may be located near the dash trim switch, at the trim pump, in the
positive (red) power trim battery lead near the battery switch, or a combination of these.

Check all associated electrical connections and wires (especially battery cables). Clean and
tighten faulty connection. Repair or replace wiring.

Remedy

Power Trim Does Not Operate (Motor Operates but Sterndrive Unit Does Not Move)

Possible Cause
Trim pump oil level low. Fill pump with oil.
Drive unit binding in gimbal ring. Check for obstruction.

Remedy

Page 88 90-8M0113857 eng DECEMBER 2015

Section 7 - Customer Assistance Information

Table of Contents

Section 7 - Customer Assistance Information

Owner Service Assistance.................................................... 90

Local Repair Service .................................................... 90

Service Away From Home ............................................ 90

Stolen Power Package ................................................. 90

Attention Required After Submersion ........................... 90

Replacement Service Parts .......................................... 90

Parts and Accessories Inquiries ............................ 90

Resolving a Problem .................................................... 90

Contact Information for Mercury Marine Customer

Service ......................................................................... 91

Customer Service Literature................................................. 91

English Language ......................................................... 91

Other Languages .......................................................... 92

Ordering Literature............................................................... 92

United States and Canada ........................................... 92

Outside the United States and Canada ........................ 92

7

90-8M0113857 eng DECEMBER 2015 Page 89

Section 7 - Customer Assistance Information

Owner Service Assistance

Local Repair Service

If you need service for your Mercury MerCruiser‑powered boat, take it to your authorized dealer. Only authorized dealers
specialize in Mercury MerCruiser products and have factory‑trained mechanics, special tools and equipment, and genuine
Quicksilver parts and accessories to properly service your engine.

NOTE: Quicksilver parts and accessories are engineered and built by Mercury Marine specifically for Mercury MerCruiser
sterndrives and inboards.

Service Away From Home

If you are away from your local dealer and the need arises for service, contact the nearest authorized dealer. If, for any reason,
you cannot obtain service, contact the nearest regional service center. Outside the United States and Canada, contact the
nearest Marine Power International service center.

Stolen Power Package

If your power package is stolen, immediately inform the local authorities and Mercury Marine of the model and serial numbers
and to whom the recovery is to be reported. This information is maintained in a database at Mercury Marine to aid authorities
and dealers in recovery of stolen power packages.

Attention Required After Submersion

1. Before recovery, contact an authorized Mercury MerCruiser dealer.

2. After recovery, immediate service by an authorized Mercury MerCruiser dealer is required to reduce the possibility of
serious engine damage.

Replacement Service Parts

WARNING

!

Avoid fire or explosion hazard. Electrical, ignition, and fuel system components on Mercury Marine products comply with
federal and international standards to minimize risk of fire or explosion. Do not use replacement electrical or fuel system
components that do not comply with these standards. When servicing the electrical and fuel systems, properly install and
tighten all components.

Marine engines are expected to operate at or near full throttle for most of their life. They are also expected to operate in both
fresh and saltwater environments. These conditions require numerous special parts. Exercise care when replacing marine
engine parts because specifications are different from those of the standard automotive engine. For example, one of the most
important special replacement parts is the cylinder head gasket. Marine engines cannot use steel‑type automotive head
gaskets because saltwater is highly corrosive. A marine engine head gasket uses special materials to resist corrosion.

Because marine engines must be capable of running at or near maximum RPM much of the time, they also have special valve
springs, valve lifters, pistons, bearings, camshafts, and other heavy‑duty moving parts.

Mercury MerCruiser marine engines have other special modifications to provide long life and dependable performance.

Parts and Accessories Inquiries

Direct any inquiries concerning Quicksilver replacement parts and accessories to your local authorized dealer. The dealer has
the necessary information to order parts and accessories for you. Only authorized dealers can purchase genuine Quicksilver
parts and accessories from the factory. Mercury Marine does not sell to unauthorized dealers or retail customers. When
inquiring about parts and accessories, the dealer requires the engine model and serial numbers to order the correct parts.

Resolving a Problem

Satisfaction with your Mercury MerCruiser product is important to your dealer and to us. If you ever have a problem, question,
or concern about your power package, contact your dealer or any authorized Mercury MerCruiser dealership. If you need
additional assistance:

1. Talk with the dealership's sales manager or service manager. Contact the owner of the dealership if the sales manager and
service manager have been unable to resolve the problem.

2. If your question, concern, or problem cannot be resolved by your dealership, please contact a Mercury Marine Service
Office for assistance. Mercury Marine will work with you and your dealership to resolve all problems.

The following information will be needed by Customer Service:

• Your name and address

• Daytime telephone number

• Model and serial numbers for your power package

• The name and address of your dealership

Page 90 90-8M0113857 eng DECEMBER 2015

Section 7 - Customer Assistance Information

• Nature of the problem

Contact Information for Mercury Marine Customer Service

For assistance, call, fax, or write. Please include your daytime telephone number with mail and fax correspondence.

United States, Canada

Telephone

Fax

Website www.mercurymarine.com

Australia, Pacific
Telephone [phone] Brunswick Asia Pacific Group

Fax [phone]

Europe, Middle East, Africa
Telephone [phone] Brunswick Marine Europe

Fax [phone]

English [phone]
Français [phone]

English [phone]
Français [phone]

41–71 Bessemer Drive
Dandenong South, Victoria 3175
Australia

Parc Industriel de Petit-Rechain
B-4800 Verviers,
Belgium

Mercury Marine
W6250 Pioneer Road
P.O. Box 1939
Fond du Lac, WI 54936-1939

Mexico, Central America, South America, Caribbean
Telephone [phone] Mercury Marine

11650 Interchange Circle North

Fax [phone]

Japan
Telephone [phone] Kisaka Co., Ltd.

4-130 Kannabecho Sakai-shi Sakai-ku

Fax [phone]

Asia, Singapore
Telephone [phone] Brunswick Asia Pacific Group

Fax [phone]

5900984 Osaka,
Japan

T/A Mercury Marine Singapore Pte Ltd
29 Loyang Drive
Singapore, 508944

Miramar, FL 33025
U.S.A.

Customer Service Literature

English Language

English language publications are available from:
Mercury Marine
Attn: Publications Department
W6250 Pioneer Road
P.O. Box 1939
Fond du Lac, WI 54936-1939

Outside the United States and Canada, contact the nearest Mercury Marine or Marine Power International Service Center for
further information.

When ordering be sure to:

• List your product, model, year, and serial numbers.

• Check the literature and quantities you want.

• Enclose full remittance in check or money order (NO COD).

90-8M0113857 eng DECEMBER 2015 Page 91

Section 7 - Customer Assistance Information

Other Languages

To obtain an Operation, Maintenance and Warranty Manual in another language, contact the nearest Mercury Marine or Marine
Power International Service Center for information. A list of part numbers for other languages is provided with your power
package.

Ordering Literature

Before ordering literature, have the following information about your power package available:

Model Serial Number
Horsepower Year

United States and Canada

For additional literature for your Mercury Marine power package, contact your nearest Mercury Marine dealer or contact:

Mercury Marine

Telephone Fax Mail

Mercury Marine

(920) 929‑5110

(USA only)

Outside the United States and Canada

Contact your nearest Mercury Marine authorized service center to order additional literature that is available for your particular
power package.

(920) 929‑4894

(USA only)

Attn: Publications Department

P.O. Box 1939

Fond du Lac, WI 54936-1939

Mercury Marine
Submit the following
order form with payment
to:

Ship To: (Copy this form and print or type–This is your shipping label)

Name

Address

City, State, Province

ZIP or postal code

Country

Quantity Item Stock Number Price Total

Attn: Publications Department

W6250 Pioneer Road

P.O. Box 1939

Fond du Lac, WI 54936-1939

. .
. .
. .
. .
. .

Total Due .

Page 92 90-8M0113857 eng DECEMBER 2015