The following are registered trademarks of
Brunswick Corporation: Merc, MerCathode,
MerCruiser, Mercury, Mercury Marine,
Quicksilver, and Ride-Guide.
INSTALLATION MANUAL D7.3L D-TRONIC
DIESEL ENGINES - BRAVO MODELS
NOTICE to INSTALLER
After Completing Installation, These Instructions Should Be Placed with the Product for the Owner’s
Future Use.
NOTICE to COMMISSIONING DEALER
Predelivery Preparation Instructions Must be Performed Before Delivering Boat To The Product
Owner.
Table of Contents
General Information 2. . . . . . . . . . . . . . . . . . . . . . .
Notice to Installer 2. . . . . . . . . . . . . . . . . . . . . . . .
Bravo Three Notice: Trim-In Limit Pin 3. . . . . .
Multiple Sterndrive Steering Tie Bar
Arrangements 4. . . . . . . . . . . . . . . . . . . . . . . . . . .
Quicksilver Products 5. . . . . . . . . . . . . . . . . . . . .
Torque Specifications 6. . . . . . . . . . . . . . . . . . . .
Serial Number Decal Placement 6. . . . . . . . . . .
Corrosion Protection 6. . . . . . . . . . . . . . . . . . . . .
Antifouling Paint 7. . . . . . . . . . . . . . . . . . . . . . . . .
Installation Requirements 8. . . . . . . . . . . . . . . . .
Boat Construction 8. . . . . . . . . . . . . . . . . . . . . . .
Exhaust System 11. . . . . . . . . . . . . . . . . . . . . . . .
Fuel Delivery System 12. . . . . . . . . . . . . . . . . . .
General 12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Battery 14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Battery Cables 14. . . . . . . . . . . . . . . . . . . . . . . . .
EDI Electrical System Precautions 15. . . . . . . .
Instrumentation 15. . . . . . . . . . . . . . . . . . . . . . . . .
Power Trim Control 16. . . . . . . . . . . . . . . . . . . . .
Power Trim Pump Location 16. . . . . . . . . . . . . .
Propeller Selection 17. . . . . . . . . . . . . . . . . . . . . .
Hot Water Heater Installation
Recommendation 18. . . . . . . . . . . . . . . . . . . . . .
Seawater Connections 19. . . . . . . . . . . . . . . . . .
Throttle/Shift Remote Control and Cables 20. .
Steering Helm and Cable 21. . . . . . . . . . . . . . . .
Transom Cutout 23. . . . . . . . . . . . . . . . . . . . . . . . . .
Finding Crankshaft Vertical Centerline 24. . . . .
Finding Crankshaft Horizontal Centerline
(“X” Dimension) 25. . . . . . . . . . . . . . . . . . . . . . . .
Cutting Transom 27. . . . . . . . . . . . . . . . . . . . . . . . .
Checking Transom Thickness 28. . . . . . . . . . . . .
Installing Transom Assembly 29. . . . . . . . . . . . .
Gimbal Housing 29. . . . . . . . . . . . . . . . . . . . . . . .
Inner Transom Plate 30. . . . . . . . . . . . . . . . . . . .
Power Trim Pump 31. . . . . . . . . . . . . . . . . . . . . .
Steering System 32. . . . . . . . . . . . . . . . . . . . . . . .
Speedometer Pickup 35. . . . . . . . . . . . . . . . . . . .
Drive Unit Gear Lube Monitor Hose 35. . . . . . .
Exhaust Water Bypass 36. . . . . . . . . . . . . . . . . .
Drive Unit Seawater Routing 37. . . . . . . . . . . . .
Engine Installation 39. . . . . . . . . . . . . . . . . . . . . . .
Engine Preparation 39. . . . . . . . . . . . . . . . . . . . .
Transom Preparation 40. . . . . . . . . . . . . . . . . . . .
Installing Engine / Alignment 41. . . . . . . . . . . . .
Engine Connections 46. . . . . . . . . . . . . . . . . . . . . .
Quicksilver Seawater Pickup and Seacock 46.
Seawater Strainer 47. . . . . . . . . . . . . . . . . . . . . .
Closed Cooling Recovery Bottle 48. . . . . . . . . .
Fuel Lines 49. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power Steering Hydraulic Hoses 49. . . . . . . . . .
Exhaust System 50. . . . . . . . . . . . . . . . . . . . . . . .
Electrical Connections 50. . . . . . . . . . . . . . . . . . .
Shift Cable Installation and Adjustment 54. . . .
Troubleshooting Shift Problems 58. . . . . . . . . . .
Throttle Cable Installation and Adjustment 60.
Sterndrive Unit Installation 62. . . . . . . . . . . . . . .
Predelivery Preparation 69. . . . . . . . . . . . . . . . . . .
Power Trim System Wiring Diagram 84. . . . . . .
MerCathode System Wiring Diagram 85. . . . . .
Quicksilver Instrumentation Wiring 86. . . . . . . .
Cooling System Flow Diagram 88. . . . . . . . . . . .
Predelivery Inspection 90. . . . . . . . . . . . . . . . . . . .
90-861180990 SEPTEMBER 1999 Printed in U.S.A. - 1999, Mercury Marine Page 1 of 90
D7.3L D-TRONIC DIESEL ENGINES - BRAVO MODELS
General Information
Notice to Installer
Throughout this publication, “Warnings” and “Cautions” (accompanied by the International
!
Hazard Symbol
ular 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 to these special instructions when performing the service, plus “common sense” operation, are major accident prevention measures.
Hazards or unsafe practices which could result in severe personal injury or death.
Hazards or unsafe practices which could result in minor personal injury or product
or property damage.
IMPORTANT: Indicates information or instructions that are necessary for proper installation and/or operation.
) are used to alert the installer to special instructions concerning a partic-
WARNING
CAUTION
This installation manual, including all installation requirements, has been written and published by Mercury Marine to aid boat manufacturers and installers involved in the application
and installation of the products described herein.
It is assumed that these personnel are familiar with the installation procedures of these products, or like or similar products manufactured and marketed by Mercury Marine. That they
have been trained in the recommended installation procedures of these products which includes the use of mechanics’ common hand tools and the special Mercury Marine or recommended tools from other suppliers.
It is the responsibility of the OEM to select the appropriate engine/transom/drive package
(including the correct gear ratio and propeller) for a given boat. Making an appropriate selection requires knowledge of the boat (weight, length, hull design, intended use and duty cycle,
desired speed, etc.) that is uniquely in the possession of the OEM. While Mercury employs
people capable of assisting the OEM on such issues, the final decision rests with the OEM.
Mercury recommends that any new or unique hull/power package combination be thoroughly water tested prior to sale, to verify (among other things) that the boat performs as
desired, and that the engine runs in the appropriate rpm range.
We could not possibly know of and advise the marine trade of all conceivable procedures
by which an installation might be performed, and of the possible hazards and/or results of
each method. We have not undertaken any such wide evaluation. Therefore, anyone who
uses an installation procedure and/or tool, which is not recommended by the manufacturer,
first must completely satisfy himself that neither his nor the product’s safety will be endangered by the installation procedure selected.
Page 2 of 90
It is recommended that a Mercury Marine Field Product Engineer be contacted for assistance if specific application or installation problems are encountered.
All information, illustrations, and specifications contained in this manual are based on the
latest product information available at time of publication. As required, revisions to this manual will be sent to all OEM boat companies.
Electrical system components on this engine are not external ignition protected.
DO NOT STORE OR UTILIZE GASOLINE ON BOATS EQUIPPED WITH THESE ENGINES, UNLESS PROVISIONS HAVE BEEN MADE TO EXCLUDE GASOLINE VAPORS FROM ENGINE COMPARTMENT (REF: 33 CFR). Failure to comply could result in fire, explosion and/or severe personal injury.
Notice on Bravo Trim-In Limit
NOTE: Bravo One, Two and Three Models are equipped with a Trim-In Limit Pin Insert.
It has been brought to our attention that some boats (predominantly deep-V heavy boats)
will roll up on their side under certain, specific, operating conditions. The roll can be either
to port or starboard and may be experienced while moving straight ahead, or while making
a turn. The roll occurs most frequently at or near maximum speed, with the drive unit
trimmed at or near full trim-in. While the boat will not roll completely over, the roll may be
sufficient to unseat the operator or passengers, and thereby create an unsafe situation.
The roll is caused by stern-lift created from excessive drive unit trim-in. Under these extreme
stern-lift / bow-down conditions instability can be created which may cause the boat to roll.
Weight distribution to the stern can reduce stern-lift and, in some circumstances, help to
control the condition. Weight distribution in the bow, port or starboard, may worsen the
condition.
D7.3L D-TRONIC DIESEL ENGINES - BRAVO MODELS
WARNING
The Trim-In Limit Pin Insert reduces stern-lift by preventing the drive unit from reaching the
last few degrees of full trim-in. While this device should reduce the rolling tendency, it may
not eliminate the tendency entirely. The need for this Trim-In Limit Pin Insert, and its effectiveness, can only be determined through boat testing and is ultimately the responsibility of
the boat manufacturer.
WARNING
It is recommended that only qualified personnel adjust the Trim-In Limit Pin Insert.
Boat must be water tested after adjusting or removing the device to ensure that the
modified trim-in range does not cause the boat to exhibit an undesirable boat handling characteristic if the drive unit is trimmed In at higher speeds. Increased trim-in
range may cause handling problems on some boats which could result in personal
injury.
Page 3 of 90
D7.3L D-TRONIC DIESEL ENGINES - BRAVO MODELS
Multiple Sterndrive Steering Tie Bar Arrangements
With multiple sterndrives it is important to consider which of several possible steering systems should be selected.
CAUTION
Failure to observe the recommended Tie Bar Arrangements as presented in this
section could result in serious damage to the steering and/or trim system components. This damage could adversely affect control of the boat.
INTERNAL TIE BAR ONLY
At the lower end of the performance spectrum (boats not capable of speeds in excess of
60 MPH) the basic internal tie bar is recommended. It connects the slave sterndrive to the
sterndrive that is directly connected to the factory power steering output. This internal tie
bar is available in a variety of lengths from the sterndrive manufacturer.
INTERNAL AND EXTERNAL TIE BAR
As a boat moves into a moderate performance range (60-70 MPH) or for a reduction in steering backlash, an external tie bar should be added. External tie bars are usually designed
to attach at the aft power trim cylinder bosses which is an excellent location because of its
proximity to the propeller. HOWEVER, because of the potential overstress that can occur
if one drive is trimmed much differently than the other, a dual trim control kit (Part Number
90362A3) should be installed so as to limit this potential tilt differential to about 20°.
EXTERNAL POWER STEERING
When boat speeds move past 70 MPH or if additional steering backlash reduction is desired,
external power steering is recommended. This normally will include an external tie bar
mounted at the same general location of the power steering cylinders which are generally
attached at the top of the sterndrive’ s drive shaft housing. With this steering system, no internal tie bar should be used. These steering cylinders can be attached either inboard (between) or outboard of the sterndrives.
EXTERNAL POWER STEERING WITH LOW EXTERNAL TIE BAR
For the fastest boats (over 80 MPH) or for the ultimate in steering backlash reduction, use
external power steering, BUT (where mechanically possible) with the external tie bar
mounted at the trim cylinder boss location (as previously described in “Internal and External
Tie Bar” statements). Again this system does not use an internal tie bar.
Mercury Marine does not recommend the use of an external tie bar ONLY (no internal tie
bar) when using the internal power steering system. This can cause excessive loads on the
steering components on the drive connected to the internal power steering system. These
increased loads can damage the steering components, resulting in increased play in the
steering of the boat.
Page 4 of 90
Quicksilver Products
ACCESSORIES
Quicksilver remote controls, steering systems, propellers, etc. are available for this product.
Refer to “Quicksilver Accessories Guide” for complete listing.
This “Guide” is available from:
Attn: Parts Department
Mercury Marine
W6250 W. Pioneer Road
P.O. Box 1939
Fond du Lac, WI 54936-1939
OR –
Outside of U.S.A., order through
Distribution Center, or Distributor.
INSTALLATION PRODUCTS
D7.3L D-TRONIC DIESEL ENGINES - BRAVO MODELS
DESCRIPTION
PART NUMBER
Quicksilver Engine Coupler Spline Grease 92-816391A4
Quicksilver 2-4-C Marine Lubricant With Teflon 92-825407A3
Quicksilver U-Joint and Gimbal Bearing Grease 92-828052A3
Quicksilver Special Lubricant 101 92-13872A1
Quicksilver Liquid Neoprene 92-25711-2
Quicksilver Perfect Seal 92-34227-1
Transom Drilling Fixture 91-43693A2
Engine Alignment Tool 91-805475A1
Shift Cable Adjustment Tool 91-12427
Engine Lifting Eye Tool 91-806451A1
Engine Mount Drilling Fixture 91-807903A1
Page 5 of 90
D7.3L D-TRONIC DIESEL ENGINES - BRAVO MODELS
DESCRIPTION
P
)
1
Torque Specifications
Speedometer Pickup Barb Fitting 10-15 1.2-1.6
Exhaust Pipe or Block-off Plate 20-25 27-34
Power Steering Hydraulic Hose Fittings 20-25 27-34
Power Trim Pump Hose Fittings 100-150 11-16
Propeller Nut (Bravo One and Two)
TORQUE
lb-in. lb-ft Nm
1
55 75
ropeller Nuts (Bravo Three
p
Rear Engine Mounts 35-40 47-54
Steering Cable Coupler Nut 35 47
Steering System (Pivot Bolts) 25 34
Sterndrive Unit Fasteners 50 68
Transom Assembly Fasteners 20 25 27-34
Seawater Pickup Fitting 45 5
Power Trim Cylinder Fasteners Tighten until they bottom out.
1
: Amount specified is MINIMUM.
Serial Number Decal Placement
There are three sets of engine, transom assembly and sterndrive serial number decal strips
provided with each power package. One set should be used for each of the following:
• Engine Specification Decal
• Warranty Registration Card
• Operation and Maintenance Manual identification page.
Corrosion Protection
Front 100 136
Rear 60 81
MerCruiser power packages are equipped with anodes, to help protect them from galvanic
corrosion under moderate conditions. However, for severe conditions, or if using a stainless
steel propeller, it is recommended that a Quicksilver Anti-Corrosion Anode Kit and/or a MerCathode System be installed (some models have a MerCathode System as standard equipment). A MerCathode Monitor also is available to allow the operator to check the operation
of the MerCathode System with the push of a button. (Refer to “Quicksilver Accessories
Guide” for part numbers.)
Boats which are connected to AC shore power, require additional protection to prevent destructive low voltage galvanic currents from passing through the shore power ground wire.
A Quicksilver Galvanic Isolator can be installed to block the passage of these currents while
still providing a path to ground for dangerous fault (shock) currents. (Refer to “Quicksilver
Accessories Guide” for part number.)
IMPORTANT: If AC shore power is not isolated from boat ground, the MerCathode
System and anodes may be unable to handle the increased galvanic corrosion potential.
Page 6 of 90
Antifouling Paint
IMPORTANT: Corrosion damage that results from the improper application of antifouling paint will not be covered by the limited warranty.
Painting Boat Hull or Boat T ransom: Antifouling paint may be applied to boat hull and boat
transom but you must observe the following precautions:
IMPORTANT: DO NOT paint anodes or MerCathode System reference electrode and
anode, as this will render them ineffective as galvanic corrosion inhibitors.
D7.3L D-TRONIC DIESEL ENGINES - BRAVO MODELS
IMPORT ANT: If anti-fouling protection is required for boat hull or boat transom
, copper or tin base paints, if not prohibited by law, can be used. If using copper or tin
based anti-fouling paints, observe the following:
• Avoid an electrical interconnection between the MerCruiser Product, Anodic
Blocks, or MerCathode System and the paint by allowing a minimum of 1-1/2 in.
(40mm) UNPAINTED area on transom of the boat around these items.
a
b
71176
a-Painted Boat Transom
b-Minimum 1-1/2 in. (40 mm) UNPAINTED Area Around Transom Assembly
NOTE: Drive unit and transom assembly can be painted with a good quality marine paint
or an anti-fouling paint that DOES NOT
contain copper, tin, or any other material that could
conduct electrical current. Do not paint drain holes, anodes, MerCathode system, and items
specified by boat manufacturer.
Page 7 of 90
D7.3L D-TRONIC DIESEL ENGINES - BRAVO MODELS
Installation Requirements
Boat Construction
TRANSOM
a
f
ENGINE BED
c
b
d
a-Transom Thickness - 2 in. (51mm) Minimum to 2-1/4 in.(57mm) Maximum
b-Inner Surface of Transom Must Be Parallel Within 1/8 in. (3mm) in Area
Covered by Transom Plate (e) and Remain Within Transom Thickness Limits.
c-Outer Surface of Transom Must Be Parallel Within 1/16 in. (2 mm) in Area
Covered by Transom Plate (e) and Remain Within Transom Thickness Limits.
d-Remove Keel (if Equipped) 4 ft. (1.2m) Forward to Transom
e-Transom Plate Covers 8 in. (203 mm) to either side of the vertical centerline
f-Transom Angle - 10 Degrees to 16 Degrees
22170
e e
22033
Page 8 of 90
Distance between starboard and port engine mount is 22-1/2 in. (572mm). Engine bed must
position engine so that a minimum of 1/4 in. (6mm) up and down adjustment still exists on
mounts after performing final engine alignment. This is necessary to allow for realigning engine in the future.
NOTE: Although the engine mounts allow some adjustment, it is a good practice to insure
that the front and rear mount locations in the vessel are in parallel planes. This may be
checked by tying a string from the left front mount location to the right rear mount location
and another from right front to left rear. The strings should touch where they cross
.
ENGINE COMPARTMENT
Boating standards (NMMA, ABYC, etc.) and Coast Guard regulations must be adhered to when constructing the engine compartment.
Care must be exercised in the design and construction of the engine compartment. Seams
must be located so that any rain water, which may leak through the seams, is directed away
from the air intake system. Water, that runs onto the air intake, may enter the engine
and cause serious damage to internal engine and/or turbocharger parts.
IMPORTANT: MerCruiser will not honor any warranty claim for engine damage as a
result of water entry.
ENGINE COMPARTMENT VENTILATION
General Information
According to Boating standards (NMMA, ABYC, etc.) and Coast Guard regulations the engine compartment ventilation system has multiple tasks. Included are the following:
1. To supply the engine with combustion air.
D7.3L D-TRONIC DIESEL ENGINES - BRAVO MODELS
WARNING
2. To maintain a low temperature in the engine compartment.
Fresh air should enter the engine compartment as low as possible and the heated air should
be discharged from the highest point.
If a separate air shaft (or similar) is used to provide engine compartment ventilation, or addi-
tional ventilation, care must be taken to prevent seawater and spray from entering it.
Combustion Air Requirements
Engine compartments with natural draft ventilation must have vent openings of sufficient
size and location to accomplish the tasks previously outlined.
Furthermore, in part, and according to, ABYC H-32-89 specification - “Compartment Ventilation (Diesel)” states:
“Ventilating provisions and openings to the machinery space provided for suppling combustion air shall accommodate the air requirements required by the engine manufacturer(s) for
each propulsion and auxiliary engine in that space. These openings may also function as
means of providing natural ventilation.”
IMPORTANT: The size of ventilation openings must be increased if any auxiliary
equipment is located in the engine compartment.
The combustion air requirement (per engine) for the specified engines at Wide Open
Throttle are shown in the chart below:
Combustion Air Requirements (Per Engine)
Model
D7.3L D-Tronic and D7.3L D-Tronic LD
Engine Air Requirements at
Wide Open Throttle
1000 ft.3/min. (28.2 m3/min.)
Page 9 of 90
D7.3L D-TRONIC DIESEL ENGINES - BRAVO MODELS
Multiplying the engine air flow (cfm) by 0.1 will
generally
determine the combustion air vent
size requirement (per engine). Therefore:
Engine Combustion
Air Flow (cfm) X 0.1
Combustion Air Vent Area Per Engine
=
(Square Inches)
OR
Engine Combustion Air Flow (m3/min.) X
22.8
D7.3 D-Tronic Example: 1000 X 0.1 = 100 Square Inches
OR 28.2 X 22.8 = 642.9 Sq. Cm.
1
: For engine combustion air only -
NOT
total engine compartment ventilation requirement.
Combustion Air Vent Area Per Engine
=
1
(Square Centimeters)
1
IMPORTANT: The amount of vent area required, according to Boating standards
(NMMA, ABYC, etc.) and Coast Guard regulations, for
complete
(total) engine
compartment ventilation must include the engine vent area, determined by the above
formula, plus the engine compartment ventilation requirements.
Compartment Temperature - Specifications
Too high an inlet air temperature lowers the engine performance. Therefore:
Engine compartment temperature shall not exceed outside air temperature by more than
30
° F (17° C).
Since many factors influence engine compartment temperature, temperature measurements should always be carried out.
Compartment Temperature - Testing
Test as follows:
1. The boat being tested shall be a standard production boat fitted as it would be for deliv-
ery to a dealer.
2. Temperature test meter used shall be of the type that can be read without opening the
engine cover.
3. During the test, in Step 4, engine compartments are to remain closed. No outside air is
to be forced into the engine compartment during the test and the bilge blower should not
be running.
4. Engine Running and Heat Soak Test:
a. Use 1 meter and 1 thermal couple. Position the thermal couple at the engine air inlet
(air filter).
b. Start engine to warm it up. After engine is at its normal operating temperature, run
engine at WOT rpm for 20 minutes. Record temperature readings at 5 minute intervals.
IMPORTANT: If the temperature at the engine air inlet (air filter) exceeds specifications, the engine compartment will need additional engine combustion air openings,
or an increase in engine compartment ventilation area, until the temperature remains
within specification.
Page 10 of 90
Exhaust System
IMPORTANT: It is the responsibility of the boat manufacturer or installing dealer to
properly locate the engine and install the exhaust system. Improper installation may
allow water to enter the exhaust manifolds and combustion chambers and severely
damage the engine. Damage caused by water in the engine will not be covered by
MerCruiser Warranty, unless this damage is the result of defective part(s).
Determine if a n exhaust riser kit or a water lift muf fler kit is required, by taking measurements
(a) and (b), with boat at rest in the water and maximum load aboard. Subtract (b) from (a)
to find (c). If (c) is less than specified in chart, an exhaust riser kit must be installed.
All Models (c) Must Be 13 in. (330 mm) or More
D7.3L D-TRONIC DIESEL ENGINES - BRAVO MODELS
Model (c) = (a) Minus (b)
b
a
c
merCruiser
d
Typical Engine Without Risers
a-From Waterline to Top of Transom
b-From Highest Point on Exhaust Elbow to Top of Transom
c-Equals (a) minus (b)
d-Waterline at Rest
Page 11 of 90
D7.3L D-TRONIC DIESEL ENGINES - BRAVO MODELS
Some engines may be equipped with a factory installed exhaust riser. Verify that the
riser provides the required dimension “c”, or a distance greater than “c”, as indicated.
Model (c) = (a) Minus (b)
All Models (c) Must Be 13 in. (330 mm) or More
b
Typical Engine With Riser
a-From Waterline to Top of Transom
b-From Highest Point on Exhaust Riser to Top of Transom
c-Equals (a) minus (b)
d-Waterline At Rest
Fuel Delivery System
merCruiser
a
c
d
76076
GENERAL
Page 12 of 90
WARNING
Boating standards (NMMA, ABYC, etc.) and Coast Guard regulations must be adhered to when installing fuel delivery system.
The main concern of a boat’s fuel system is safety; this must be achieved through a technically sound installation and constant inspection.
The fuel system, from the filler pipe to the fuel pump is the same, in principle, for all boats.
The Fuel Tank is an integrated component of the boat. Refer to the special information on
service and maintenance, which you have received from the thank manufacturer.
Only a few points related to function and safety are listed here [Refer to boating standards
(NMMA, ABYC, etc.) and Coast Guard regulations for complete guidelines]:
1. All connections should be on the upper side of the tank.
2. The drain plug at the lowest point on the tank serves to permit the removal of water and
sediment.
3. The filler pipe outer diameter should be at least 2 in. (50mm).
4. The tank breather pipe must have an inner diameter of at least 1/2 in. (13mm) and must
It is recommended that the exact route and length of the fuel lines be established at the first
installation of the engine to prevent problems later in connecting them to the engine.
All fuel lines must be well secured. The holes where the lines run through the bulkheads
should be carefully rounded off, or protected with rubber grommets. This prevents damage
to the lines from abrasion.
FUEL CONNECTIONS
D7.3L D-TRONIC DIESEL ENGINES - BRAVO MODELS
be fitted with a swan neck to prevent water from entering the tank.
The following, but not limited to the following, additional fuel connection related points,
plying to all engines unless otherwise stated
dards (NMMA, ABYC, etc.) and Coast Guard regulations for complete guidelines]:
1. Fuel pickup should be at least 1 in. (25mm) from the bottom of fuel tank, to prevent picking up impurities.
2. Fuel supply lines must not be smaller than 3/8 in. (11 mm) I.D. tube for V8 model. A fuel
return line between engine and fuel tank is
not be smaller than 5/16 in. (8 mm).
3. On Multi-Engine Installations: Use a
return line for each engine.
4. Larger diameter (than previously specified) lines, and fittings must be used on installations requiring long lines or numerous fittings.
5. Fuel line(s) should be installed free of stress and firmly secured to prevent vibration and/
or chafing.
6. Sharp bends in fuel lines should be avoided.
7. A flexible fuel line must be used to connect fuel supply line to fuel inlet fitting on engine,
to absorb deflection when engine is running. Injection pump fuel return line must also
have a flexible rubber hose segment.
DIESEL FUEL FILTERS AND FUEL ADDITIVES
, must be considered [Refer to boating stan-
required
separate
, for all models the return line must
tube for the fuel supply line and fuel
ap-
There is the possibility that contamination of diesel fuel and algae growth in the diesel fuel
could cause the blockage of the lift pump resulting in poor performance.
IMPORTANT: The engine is provided with an element type fuel filter, but to help eliminate water and dirt it is recommended to use an additional 10 micron, 60 gal/min. (227
L/min.) flow rated filter that has a water trap.
It is recommended that in MerCruiser Diesel applications, an additional fuel filter equipped
with a water trap be installed before the lift pump. MerCruiser recommends a 10 micron, 60
gallon per minute (227 L/min.) rated filter, such as a Racor Model 500(Quicksilver Part
Number 35-850481 with SAE threads, and 35-809867 with Metric threads) or equivalent.
This will help to filter out contaminants in diesel fuel.
Select a suitable position in the fuel system between the fuel feed pump and the fuel tank
for the additional filter The position selected must be free from vibrations, and allow for easy
inspection and replacement.
It is also recommended that a diesel fuel additive be added (to combat algae growth) particularly in warmer climates. Additives reduce the chances of algae growth in the diesel fuel.
Page 13 of 90
D7.3L D-TRONIC DIESEL ENGINES - BRAVO MODELS
Battery
IMPORTANT: Boating industry standards (BIA, ABYC, etc.) federal standards and
Coast Guard regulations must be adhered to when installing battery. Be sure battery
cable installation meets the pull test requirements and that positive battery terminal
is properly insulated in accordance with regulations.
IMPORT ANT: It is recommended (required in some states) that battery be installed in
an enclosed case. Refer to regulations for your area.
IMPORTANT: Engine electrical system is negative (–) ground.
Select a battery that meets all of the following specifications:
• 12-volt marine type.
Battery Cables
• Tapered post connectors or side terminal connectors. Do
connectors.
• Battery capacity rating of at least:
Engine
(Cyl./type)
8 / V, D7.3L D-Tronic and D7.3L D-Tronic LD 1500 cca, 1920 mca or 300 Ah
Select proper size positive (+) and negative (–) battery cables, using chart. Battery should
be located as close to engine as possible.
IMPORTANT: Terminals must be soldered to cable ends to ensure good electrical
contact. Use electrical grade (resin flux) solder only. Do not use acid flux solder, as
it may cause corrosion and a subsequent failure.
Battery Cable Length
Up to 3 ft. (0.9m) 2 ( 35mm2)
3 - 3-3/4 ft. (0.9 - 1.1m) 1 ( 50mm2)
3-3/4 - 4-3/4 ft. (1.1 - 1.4m) 0 ( 50mm2)
not
use a battery with wing nut
Minimum Required Cranking
Battery Size
Minimum Cable
Gauge
Page 14 of 90
4-3/4 - 6 ft. (1.4 - 1.8m) 00 ( 70mm2)
6 - 7-1/2 ft. (1.8 - 2.3m) 000 ( 95mm2)
7-1/2 - 9-1/2 ft. (2.3 - 2.9m) 0000 (120mm2)
9-1/2 - 12 ft. (2.9 - 3.7m)
12 - 15 ft. (3.7 - 4.6m)
15 - 19 ft. (4.6 - 5.8m)
:Two cables of specified gauge required for positive and two required for negative.
00 ( 70mm2)
000 ( 95mm2)
0000 (120mm2)
EDI Electrical System Precautions
NOTE: The following precautions apply to all EDI model Engines.
Avoid damage to the Electronic Direct Injection (EDI) electrical system and components. Refer to the following precautions when working on or around the EDI electrical harness or when adding other electrical accessories:
• DO NOT tap accessories into engine harness.
• DO NOT puncture wires for testing (Probing).
• DO NOT reverse battery leads.
• DO NOT splice wires into harness.
• DO NOT attempt diagnostics without proper, approved Service Tools.
Instrumentation
GENERAL
We recommend using Quicksilver Instrumentation and Wiring Harnesses. Refer to “Quicksilver Accessories Guide” for selection.
D7.3L D-TRONIC DIESEL ENGINES - BRAVO MODELS
CAUTION
NOTE: If using other than Quicksilver instrumentation and harnesses, refer to manufactur-
ers’ instructions.
The six basic gauges that must be used with the engine are:
• Tachometer
• Oil Pressure
• Water Temperature
• Voltmeter
• Cruise Log (Engine Hour Meter)
• Trim Gauge
When using the instrumentation, instrument harness wire connectors are labeled. It will be
necessary to connect them onto the individual Quicksilver instruments, switches and Engine System Monitor panel. The instrumentation harness ends are provided for connection
into the appropriate extension harness ends. The wiring harnesses will then be ready to
route to the engine.
On dual station applications, oil pressure and water temperature senders (on engine) must
be changed.
Additionally, changes are needed in the primary station key switch wiring to allow use of start
and stop switches common on dual station panels. Refer to instructions in kit.
When routing any wiring extension harness back to the engine, make sure that the harness
does not rub or get pinched. Be sure all extension harness connector collars are secure.
Fasten harnesses to boat at least every 18 in. (460 mm) using appropriate fasteners.
Page 15 of 90
D7.3L D-TRONIC DIESEL ENGINES - BRAVO MODELS
c
a
D7.3L D-Tronic Shown - All Similar
a-Engine Harness Connector
b-Extension Harness Connector (From Instruments)
c-Electrical Bracket
TACHOMETER SPECIAL INFORMATION
IMPORTANT: If using a tachometer from another manufacturer,
netic tachometer pickup
If using the Quicksilver Tachometer provided with the engine package, the appropriate setting of the switch located on the back of the tachometer is given in the following chart.
b
76010
do not use the mag-
(or related wiring) mounted on the flywheel housing.
D7.3L D-Tronic and D7.3L D-Tronic LD 4 (155)
Power Trim Control
Any of the Quicksilver panel or in-handle type trim controls (that are specified for use with
MerCruiser sterndrives) can be used with this Power Trim system. Install trim control in accordance with instructions that accompany it.
Power Trim Pump Location
Select an appropriate mounting location for the trim pump that meets the following requirements:
• Within limit s o f b l ack and gray hydraulic hoses (coming from gimbal housing assembly).
• Close to the battery so that trim pump battery leads can be connected.
• Allow easy access to trim pump oil fill and vent locations.
• Area where pump will not be exposed to water.
• Trim pump must be mounted so that when steering wheel is turned in either direction
(right or left), the power steering booster cylinder does not come in contact with trim
pump.
Tachometer Switch Setting
Model
Switch Position
(Teeth Count on Flywheel)
Page 16 of 90
Propeller Selection
GENERAL INFORMATION
IMPORTANT: Installed propeller must allow engine to run at its specified maximum
wide-open-throttle revolutions per minute (rpm). Use an accurate service tachometer
to verify engine operating rpm.
It is the responsibility of the boat manufacturer and/or the selling dealer to equip the power
package with the correct propeller(s). Specified engine wide-open-throttle (WOT) and operating rpm range are listed in the “Operation and Maintenance Manual” attached to the engine.
Select a propeller that will allow the engine power package to operate at or near the top end
of the recommended wide-open-throttle operating rpm range with a normal load. High rpm,
caused by an excessive trim angle, should not be used in determining correct propeller
selection.
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/or damage. Generally, there is a 200 rpm change between propeller pitches.
After initial propeller selection, the following common problems may require that the propeller be changed to a lower pitch:
D7.3L D-TRONIC DIESEL ENGINES - BRAVO MODELS
RPM REV-LIMITER
• Warmer weather and greater humidity cause an rpm loss.
• Operating in a higher elevation causes an rpm loss.
• Operating with increased load (additional passengers, pulling skiers, etc.).
For better acceleration, such as is needed for water skiing, use the next lower pitch propeller. However , do not operate at full throttle when using the lower pitch propeller but not pulling skiers.
Because of the many variables of boat design, only testing will determine the best propeller
for a particular application. Available propellers are listed in the “Quicksilver Accessories
Guide.”
See “BOAT-IN-THE-WATER TESTS, Maximum rpm Test” in the power package Installation
Manual.
IMPORTANT: When selecting a propeller consider this additional information:
The engines listed in the following chart are equipped with a device that limits engine
rpm. Be sure that propeller being used does not allow engine to run against limiter,
as a significant loss in performance will result.
Engine rpm
MCM Model
Engine Recommended
Operating rpm Range
Rpm Limiter Setting
(Begins At:)
D7.3L D-Tronic 3600-3800 3850
D7.3L D-Tronic LD 3400-3600 3650
Page 17 of 90
D7.3L D-TRONIC DIESEL ENGINES - BRAVO MODELS
Hot Water Heater Installation Recommendation
IMPORTANT: When connecting a cabin heater or hot water heater, certain requirements must be met, including, but not limited to the following:
• Supply hose (from engine to heater) and return hose (from heater to engine)
MUST NOT EXCEED 5/8 in. (16 mm) I.D. (inside diameter).
• Make heater connections ONLY at locations indicated in the following information.
• Refer to manufacturers’ instructions for complete installation information and
procedures.
IMPORT ANT: Do not reposition engine temperature switch, it must remain where installed by factory.
CAUTION
Heater must be mounted lower than the fill cap on the heat exchanger. If the heater
is higher than the fill cap on the heat exchanger and some coolant is lost from system, an air pocket may form in the closed cooling system. This can cause the engine
to overheat.
A Hot Water Heater Adaptor Kit is available from Quicksilver. This kit contains installation
instructions. Locations for fittings are shown following.
PART NUMBER
854570A1 Hot Water Heater Adaptor Kit
SUPPLY HOSE CONNECTION
a-Location for Water Heater Supply Hose (Bayonet Fitting Replaces Plug)
DESCRIPTION
a
71898
76024
Page 18 of 90
RETURN HOSE CONNECTION
a-Location on Water Circulation Pump for Hot Water Return (Bayonet Fitting
Replaces Plug)
Seawater Connections
D7.3L D-TRONIC DIESEL ENGINES - BRAVO MODELS
a
76023
D7.3L D-Tronic and D7.3L D-Tronic LD models must be equipped with a through hull or
through transom water supply to ensure sufficient water flow to the engine. The transom
assembly needs to be modified with the water passage block-off plate kit (P/N 818304A1)
provided. It is necessary to cut the water hose that is located between the bell housing and
the gimbal housing. This allows water to continue through the drive for cooling. Refer to
“Drive Unit Seawater Routing.” outlined later. Read and observe the following to select the
proper seawater pickup hose, seacock size and seawater strainer.
Seawater Connections - General Information
SEAWATER PICKUP HOSE
Seawater inlet hose connections must be made with wire reinforced hose of adequate wall
thickness to prevent it from collapsing from pump suction. Be sure to secure hose connections with hose clamps. Secure hose to prevent contact with any moving parts of the engine.
Seawater Pickup Hose Inner Diameter
All Models 1-1/2 in. (38mm)
SEACOCK SIZE
Seacock used must have an internal cross-sectional area equal to or greater than seawater
inlet hose to prevent restricting water flow . Install valve in an area where it will be easily accessible and supported adequately to prevent hose fatigue. A brass ball or gate valve is required.
Seacock Size
(Internal Cross-Sectional Area Equal to or Greater Than Size Shown)
All Models 1-1/2 in. (38mm)
Page 19 of 90
D7.3L D-TRONIC DIESEL ENGINES - BRAVO MODELS
SEAWATER STRAINER
Strainer used must be of sufficient size to ensure that an adequate supply of water will be
maintained for cooling the engine.
Seawater Strainer Minimum Flow Rate
All Models 40 (150)
1
Amount listed is in gallons per minute and (liters per minute).
Install seawater strainer in an area where it will be easily accessible for inspection and
cleaning. Strainer should be installed in water inlet hose after the seacock (water inlet valve)
to allow operator to shut off water when cleaning strainer.
Throttle/Shift Remote Control and Cables
To ensure proper shift and throttle operation, we recommend the use of a Quicksilver remote
control and cables. Refer to “Quicksilver Accessories Guide” for selection. However, if a
control other than Quicksilver is to be used, control must provide the following:
Shift Cable Travel
(At shift plate end.)
2-7/8 in. (73mm) to 3-1/8 in. (80mm) 15-20 lb. (6.8-9 kg)
1
Shift Cable Load
(Applied to the cable end guide.)
Page 20 of 90
Steering Helm and Cable
Transom assembly is shipped with the steering cable guide tube preset for cables with end
dimensions that comply with ABYC standards as outlined in the NMMA certification handbook. The steering cable coupler nut must also have a means of locking it to the guide tube
as specified in ABYC requirements.
Failure to use a steering cable locking device could cause loss of steering, which
could cause damage to the boat and/or injury.
All current production Quicksilver Ride Guide steering cables have a self-locking coupler
nut and do not require an external locking device. (Other cable manufacturers also make
cables with self-locking coupler nut.)
D7.3L D-TRONIC DIESEL ENGINES - BRAVO MODELS
WARNING
a
22060
a-Quicksilver Ride Guide Steering Cable Self-Locking Coupler Nut (Identified by
Groove)
If using a steering cable that does not have a self-locking coupler nut, an external locking
device must be used.
c
b
e
a
f
d
a-Steering Cable
b-Grease Fitting
c-Cotter Pin
d-Locking Sleeve (If Required - Must Be Ordered Separately)
e-Cable Coupler Nut
f-Cable Guide Tube
Page 21 of 90
D7.3L D-TRONIC DIESEL ENGINES - BRAVO MODELS
POWER STEERING EQUIPPED UNITS ONLY: If steering cable with improper dimensions is installed, severe damage to transom assembly and/or steering system may
result.
1. Steering cable must be the correct length, particularly when installed in larger boats.
2. Avoid sharp bends, kinks or loops in cable.
3. Fully extended steering cable end dimension must be as shown.
STEERING CABLE SPECIFICATIONS
CAUTION
a
b
k
l
a-Coupler Nut - 7/8 - 14 UNF - 28 Thread
b-11-3/4 in. (298 mm) Min.
c-Interface Point
d-1/2 in. (12.700 mm) Max.
e-.420 in. (10.668 mm) Min. Flat
f-.102 in. (0.508 mm) Min. Radius
g-5/8 in. (15.875 mm) Max. Diameter End Fitting
h-3/8 in. (9.525 mm)
i-.385 in. (9.779 mm) Diameter Thru Hole, Chamfered Each Side
j-1-3/8 in. (34.925 mm) Max
k-5/8 in. (15.875 mm) Diameter Tube
l-Mid-Travel Position - 16-7/8 in. (428.6 mm) Total Travel To Be 8 in. (203.2 mm)
Min. to 9 in. (228.6 mm) Max Travel Each Side of Mid-Travel Position - 4 in.
(101.6 mm) Min., 4-1/2 in. (114.3 mm) Max.
c
d
e
f
j
g
C
L
h
i
21435
Page 22 of 90
a
a-Steering Cable Mounting Flange
b-Center of Hole in Steering Cable End
c-21-3/8 in. (543 mm) Max.
b
c
21436
Transom Cutout
Before Starting Installation Read “General Information” and “Installation Requirements”
Sections Completely.
IMPORTANT: The following instructions will provide a sterndrive unit mounting location that is suitable for most boats. Best mounting location for a particular boat, however, can be determined only by testing.
Bravo Models use items 1 - 4.
D7.3L D-TRONIC DIESEL ENGINES - BRAVO MODELS
NOTICE to INSTALLER
1. Below 25 m.p.h. (40 km/h):
2. Heavy Duty Applications:
3. Above 25 m.p.h. (40 km/h):
4. Above 50 m.p.h. (80 km/h):
ance in some applications, but pulling power (for skiing) will decrease. During testing,
“X” Dimension should be increased 1/2 in. (13mm) at a time until desired performance
is achieved but in no case should it ever be increased by more than:
Bravo One/Two:
Bravo Three:
In ALL applications where cooling water is supplied through the sterndrive unit to the
engine, extreme care should be taken when raising drive unit to ensure that the water
supply does not become aerated. Use a clear, water inlet hose to check incoming water for
aeration. Monitor engine temperature gauge to ensure engine does not overheat.
In applications where cooling water is supplied to the engine by a fitting through the
hull or transom, the sterndrive height will not cause cooling water aeration.
IMPORTANT: Damage to MerCruiser products caused by too high of an installed
height will not be covered by MerCruiser warranty.
Subtract 1/2 in. (13mm) from “X” Dimension Shown.
Subtract 1 in. (25mm) from “X” Dimension shown.
Use “X” Dimension shown.
The “X” Dimension can be increased to improve perform-
3 in. (76 mm) maximum.
1 in. (25 mm) maximum.
Page 23 of 90
D7.3L D-TRONIC DIESEL ENGINES - BRAVO MODELS
Finding Crankshaft Vertical Centerline
SINGLE ENGINE
Locate and mark vertical centerline on transom.
a-Vertical Centerline
DUAL ENGINE
1. Locate and mark boat vertical centerline (a) on transom.
a
71620
a
a-Vertical Centerline
2. Locate and mark crankshaft vertical centerlines (a) on transom.
b
a a
c
c
a-Draw Crankshaft Vertical Centerline through Desired Mounting Locations
b-Minimum Distance between Crankshaft Vertical Centerlines
c-Crankshaft Vertical Centerlines Must Be an Equal Distance from Boat Vertical
Centerline
71620
22033
Page 24 of 90
Minimum Distance Between Crankshaft
Vertical Centerlines (Dual Side-By-Side) Chart
Model Measurement [ in. (mm) ]
D7.3L D-Tronic and D7.3L D-Tronic LD 36-1/2 (927)
D7.3L D-TRONIC DIESEL ENGINES - BRAVO MODELS
Finding Crankshaft Horizontal Centerline (“X” Dimension)
“X” Dimension can be measured by the “90° Tool Method” or by the “Tape Measure Method.”
90
° TOOL METHOD
1. Construct 90° tool.
a
90°
b
71621
a-Dimension from Chart Below
b-Measurement: 4 ft. (1.2 m)
To Lower Drive Unit - Subtract
To Raise Drive Unit - Add
90° TOOL VERTICAL DIMENSION CHART
Sterndrive Unit Location
Bravo One/Two/Three 13-9/16 in. (345mm)
IMPORTANT: This dimension should only be raised or lowered after proper testing.
2. Determine “X” Dimension location of crankshaft centerline(s).
from dimension “a”.
to dimension “a”.
b
c
c
b
a
71622
Single Engine Dual Engine
a-Place 90
b-Point at Which Top of Tool Contacts Transom on Vertical Centerline is Crank-
shaft Horizontal Centerline.
c-Draw a Line Perpendicular to Vertical Centerline at Crankshaft Horizontal
Centerline.
° Tool Along Boat Bottom at Vertical Centerline
a
Page 25 of 90
71623
D7.3L D-TRONIC DIESEL ENGINES - BRAVO MODELS
TAPE MEASURE METHOD
Transom angle must be known, then measure “X” Dimension with tape measure.
1. Determine “X” Dimension from the following chart.
Tape Measure Method Chart
Model
Transom Angle
16°
15°
14°
13°
12°
11°
10°
This dimension should only be raised or lowered after proper
Bravo One / Two / Three
testing.
14-5/16 in. (364 mm)
14-1/4 in. (362 mm)
14-3/16 in. (360 mm)
14-1/8 in. (359 mm)
14-1/16 in. (357 mm)
14 in. (356 mm)
13-15/16 (354 mm)
2. Measure and layout horizontal centerlines as shown.
b
c
d
d
a
71622
b
c
a
71623
Single Engine Dual Engine
a-“X” Dimension (from Chart) that Corresponds to Transom Angle - Measure Up
from Boat Bottom with Tape Measure
b-Crankshaft Horizontal Centerline
c-Vertical Centerline
d-Draw a Line Perpendicular to Vertical Centerline at Crankshaft Horizontal
Centerline
Page 26 of 90
Cutting Transom
Transom cutout can be made by either using the Template [shipped with transom assembly]
or the Transom Drilling Fixture Kit (purchased separately).
Follow instructions indicated on template or provided with drilling fixture.
IMPORTANT: Read and observe the following information:
• Be certain that centerlines on either the template or transom drilling fixture align
with lines previously marked on transom.
• Be sure to drill 1/4 in. pilot holes (for hole saw guide) at a 60° angle and to cut on
the line when making transom cutout. If cutout is made incorrectly, drive unit
steering lever may contact transom, thus limiting steering travel.
• Seal inside edge of transom cutout opening with a suitable sealant to prevent water absorption and deterioration of transom.
D7.3L D-TRONIC DIESEL ENGINES - BRAVO MODELS
Transom Cutout Template
Transom Drilling Fixture Kit
50017
22056
Page 27 of 90
D7.3L D-TRONIC DIESEL ENGINES - BRAVO MODELS
Checking Transom Thickness
Ensure transom surface thickness and flatness conform to minimums specified in “Installation Requirements” listed previously.
NOTE: Transom must be between 2” (51 mm) and 2-1/4” (57 mm) a distance of 8” (203 mm)
to either side of the vertical centerline.
a
b
c
a-Measuring Thickness
b-Measuring Flatness
c-Suitable Mandrel To Check For Uniform Transom Thickness.
Page 28 of 90
Installing Transom Assembly
Gimbal Housing
1. Carefully remove transom assembly from shipping carton.
2. Remove and read all tags which are attached to transom assembly.
IMPORTANT: Read and observe the following regarding your engine and the thrupropeller exhaust system:
• With any application, installation of an exhaust tube will increase exhaust noise.
• With Bravo One, Bravo Two and Bravo Three Drive Models the exhaust bellows
must be removed and an exhaust tube MUST BE INSTALLED.
NOTE: Exhaust tube parts (Quicksilver Part Number 78458A1) are provided with a Bravo
Three Drive. They are located in the drive unit box.
3. Install exhaust tube on gimbal housing as follows:
a. Remove and discard clamps and exhaust bellows.
Exhaust tube clamp may corrode if grounding clip is not installed.
D7.3L D-TRONIC DIESEL ENGINES - BRAVO MODELS
CAUTION
b. Install grounding clip on tube.
NOTE: Bellows adhesive is not used when installing an exhaust tube.
c. Position tube so that “SIDE” markings on tube are facing toward the right and left
sides.
d. Install clamp.
e. Tighten clamp. Torque to 35 lb-in. (4 Nm).
e
d
22184
c
b
a
22184
a-Exhaust Tube
b-Clamp
c-“Side” Marking
d-Exhaust Tube
e-Grounding Clip
Page 29 of 90
D7.3L D-TRONIC DIESEL ENGINES - BRAVO MODELS
Inner Transom Plate
1. Insert wires, hoses and shift cable through appropriate openings in inner transom plate.
2. Position gimbal housing on transom and hold in place.
NOTE: When tightening transom assembly fasteners in the following step, start in the center
and, using a circular pattern, move outward. Tighten in small increments and go around the
pattern several times until the proper torque is achieved.
IMPORTANT: Steering lever continuity circuit wire must be positioned as shown to
avoid stressing wire when steering lever moves.
a
71626
a
c
70005
b
d
71628
71629
72043
a
Page 30 of 90
a-Locknuts and Flat Washers (8)
b-Bolt
c-Steering Lever Continuity Wire
d-Transom Plate Continuity Wire
3. Secure transom assembly with hardware as shown. Torque to 20-25 Ib-ft (27-34 Nm).
Power Trim Pump
1. Mount pump in desired location.
IMPORTANT: Make hydraulic connections as quickly as possible to prevent oil from
leaking out of system. Be careful not to cross-thread or overtighten hose fittings.
d
D7.3L D-TRONIC DIESEL ENGINES - BRAVO MODELS
c
75126
75127
b
f
g
a
50630
e
a-Black Hose (UP Circuit)
b-Gray Hose (DOWN Circuit)
c-Harness Connector
d-Clamp
e-Trim Limit Switch Wire (with Blue Sleeve) - to BLUE/WHITE Harness Wire
f-Trim Limit Switch Wire (with Purple Sleeve) to PURPLE/WHITE Harness Wire
g-Wire Retainer and Sta-Strap
2. Connect hydraulic hoses to trim pump. Torque fittings to 100-150 lb-in. (11-16 Nm).
3. Connect power trim pump control harness to trim pump. Secure with clamp.
4. Connect trim limit switch wires and secure with wire retainer and sta-strap.
50632
Page 31 of 90
D7.3L D-TRONIC DIESEL ENGINES - BRAVO MODELS
Steering System
NOTE: For Dual Installations, Power steering unit can be mounted on port or starboard
transom assembly. Measure exact distance between power package centerlines. Select a
tie bar from Quicksilver Accessory Guide. Refer to tie bar installation instructions before proceeding.
1. Inspect bushings for debris. Lubricate bushings with Special Lubricant 101.
a-Bushings
b-Special Lubricant 101
a
B
73898
2. Remove upper and lower pivot bolts and ensure threads are well lubricated with Special
Lubricant 101.
3. Install steering assembly as follows:
a. Position steering assembly so that pivot bolts will enter bushings in pivot block or
power steering control valve.
b. Install upper and lower pivot bolts along with tab washers. Ensure that tab washer
tangs straddle the ridge on inner transom plate.
c. Turn pivot bolts all the way in by hand to ensure proper alignment.
d. Ensure steering assembly pivots freely.
b
c
73899
a
Page 32 of 90
a
c
73900
a-Tab Washers
b-Ridge
c-Pivot Bolts
D7.3L D-TRONIC DIESEL ENGINES - BRAVO MODELS
4. Torque pivot bolts to 25 lb-ft (34 Nm). Bend washer tabs against corresponding flats on
bolt heads.
CAUTION
MOVING THE CONTROL VALVE RAM with the hoses disconnected will expel fluid
from the ports. Wear eye protection.
5. The cylinder ram may be stiff and difficult to move when you attempt to pull it out or push
it in for installation. First move the spool assembly in the direction(s) shown below.
a
a
74145
74144
a-Ports
6. Connect clevis to steering lever. Lubricate clevis pin with Special Lubricant 101. Be sure
to spread both ends of the cotter pin.
c
b
a
a-Clevis
b-Steering Lever
c-Clevis Pin
d-Cotter Pin
d
71904
Page 33 of 90
D7.3L D-TRONIC DIESEL ENGINES - BRAVO MODELS
7. Connect steering cable as follows:
a. Remove shipping cap from both ends of steering cable guide tube.
b. Coat steering cable end with a liberal amount of Special Lubricant 101.
c. Install steering cable and secure with hardware as shown.
g
h
e
f
a-Steering Cable
b-Grease Fitting
c-Cable Coupler Nut
d-Cable Guide Tube
e-Steering Cable End
f-Clevis
g-Clevis Pin
h-Cotter Pin
71901
71906
d
73901
c
b
a
d
71903
Page 34 of 90
IMPORTANT: Slight feedback in the steering system could be encountered if the
cable guide tube flat surfaces are not positioned vertically.
d. Using a suitable wrench hold the flat surfaces on the cable guide tube in the vertical
position. Torque coupler nut to 35 lb-ft (47 Nm). Be certain the flat surfaces are
still aligned vertically after torque is applied to coupler nut.
CAUTION
Steering cable outer casing must be free to move back and forth for steering system
to function properly. Do not fasten any items to steering cable.
Speedometer Pickup
IMPORTANT: Do not disturb plug at speedometer fitting if no speedometer is to be
fitted, or if an alternate speedometer pickup will be used.
1. Remove plug from speedometer pickup tube fitting.
D7.3L D-TRONIC DIESEL ENGINES - BRAVO MODELS
a
a-Fitting Plug
b-Speedometer Pickup Tube Fitting
2. Apply Perfect Seal to threads of barb fitting. Install and torque to 10-15 Ib. in. (1.1-1.7
N⋅m).
a-Barb Fitting
3. Connect hose from speedometer to barb fitting. Secure hose with cable tie.
4. Mount speedometer hose to transom with hose clip and screw. Hose must not come in
contact with steering system components or the engine coupler and drive shaft.
Drive Unit Gear Lube Monitor Hose
b
70037
a
70015
1. Connect gear lube monitor hose to 90° hose fitting. Secure with hose clamp.
b
a
c
75874
a-Hose
b-Fitting
c-Clamp
2. Connect 90
° hose fitting and hose to gimbal housing fitting.
CAUTION
Avoid drive unit damage. Ensure gear lube monitor hose is not kinked when connected. If hose is kinked, monitor will not function properly and damage to drive unit
could occur.
Page 35 of 90
D7.3L D-TRONIC DIESEL ENGINES - BRAVO MODELS
3. Route hose to monitor bottle mounted on engine and cut off excess hose.
IMPORTANT: Avoid using excessive hose when routing to gear lube monitor. Hose
should be routed directly, in as straight a line as possible, to avoid low spots (traps)
in the system.
d
a-Hose
b-90
c-Gimbal Housing Fitting
d-Gear Lube Monitor
IMPORTANT: Hose must not come in contact with steering system components or the
engine coupler and drive shaft.
Exhaust Water Bypass
MerCruiser D7.3L D-Tronic Models are equipped with an exhaust water bypass system.
The purpose of this exhaust water bypass system is to calibrate the exhaust back pressure
and to provide additional cooling to the drive assembly.
The exhaust water bypass outlet (provided with instructions for installation) must be
installed within the Preferred or Alternative Area as indicated on the template. Refer to the
full scale template (provided). Ensure that the water outlet snout is positioned in such a way
that the water will flow over the top (preferred location) or upper side (alternative location)
of the Drive Assembly.
74235
° Hose Fitting
a
75874
c
b
75313
Page 36 of 90
a
b
a-Template
b-Preferred Exhaust Water Bypass Routing
1. Cut template outline as required. Position on transom.
2. Drill or cut hole as indicated on template.
3. Use silicone or other Marine sealer and install exhaust water outlet on boat transom.
4. Exhaust outlet on transom must be grounded to inner transom plate assembly. Install
ground strap provided.
5. Cut hose to required length. Install between exhaust elbow fitting and exhaust water bypass outlet. Use double clamps on hose connections.
Drive Unit Seawater Routing
Seawater for engine cooling is supplied through a separate seawater pickup, not through
the drive unit. Therefore, it is necessary to block the drive unit seawater passage and to cut
the water hose that is located between the bell housing and the gimbal housing. This allows
water to continue to circulate through the drive unit for cooling.
BLOCK-OFF PLATE
1. Install block-off plate with gasket. Torque screws with star washers to 45 lb-in. (5 Nm).
a
D7.3L D-TRONIC DIESEL ENGINES - BRAVO MODELS
b
c
a
b
75314
c
a-Plate
b-Gasket
c-Screw And Washer
75313
CAUTION
Avoid drive unit damage. Quick release button on gear lube monitor 90° hose fitting
may not lock on gimbal housing if touching or depressed by block-off plate. Ensure
quick release button does not contact block-off plate. Failure to do so could result
in a loose 90
2. Position quick release button on hose fitting away from block-off plate. Release button
must not contact block-off plate.
° fitting causing a loss of gear lube and damage to drive unit.
a
OK
c
d
b
a-Water Inlet Fitting
b-Star Washer and Screw
c-90
d-Quick Release Button
° Hose Fitting
d
71998
Page 37 of 90
D7.3L D-TRONIC DIESEL ENGINES - BRAVO MODELS
SEA WATER HOSE
NOTE: The trim limit switch wires and speedometer hose are attached to the water hose.
Prior to cutting the hose, move the wires and speedometer hose to avoid cutting them when
cutting water hose. The existing sta-strap and clip can be reused if they are moved out of
the way while cutting the water hose.
1. Move existing sta-strap and clip. Cut the water hose in the area shown. Loosen clamp
and remove short piece of hose remaining on gimbal housing.
2. Secure the trim limit switch wires and speedometer hose to remaining hose piece on
transom assembly.
e
c
f
75852
b
d
a-Sta-Strap
b-Clip
c-Seawater Inlet Hose
d-Speedometer Hose
e-Trim Limit Wire Harness
f-Cut Water Hose Here
g-Hose Piece – To Be Removed
a
g
71184
Page 38 of 90
Engine Installation
Engine Preparation
1. Remove and read all tags attached to engine.
2. Remove all hardware that secures engine to shipping container.
3. Loosen fasteners and remove exhaust pipe and exhaust hose from pallet.
4. Connect battery cables to engine. Be sure to observe the following:
a. Make sure that grounding stud and starter solenoid terminal are free of paint or any
other material that could cause a poor electrical connection.
b. After battery cables are connected, apply a thin coat of Liquid Neoprene to the termi-
nals.
c. Be sure to slide rubber boot over positive (+) terminal after making connection.
5. Drape battery cables over top of engine to prevent them from getting in the way during
installation.
D7.3L D-TRONIC DIESEL ENGINES - BRAVO MODELS
a
d
e
b
Typical
a-Grounding Stud (Starboard Side - Port Similar)
b-Negative (–) Battery Cable
c-Positive (+) Battery Cable
d-Rubber Boot (Slide Over Terminal)
e-Starter Solenoid
6. Remove shipping plug from coupler and lubricate splines with Engine Coupler Spline
Grease.
76015
c
76026
Typical
a-Shipping Plug
a
74305
Page 39 of 90
D7.3L D-TRONIC DIESEL ENGINES - BRAVO MODELS
Transom Preparation
IMPORTANT: Exhaust pipe and gimbal housing mating surfaces must be clean and
free of nicks and scratches, and O-ring must be properly seated in groove, or water
and exhaust may leak into boat.
a
b
22059
a-Gimbal Housing Mating Surface
b-O-ring
1. Install exhaust pipe assembly as shown, using four (4) bolts and thick lockwashers.
Torque bolts to 20-25 lb-ft (27-34 Nm).
2. Position rear engine mount attaching hardware on inner transom plate mounts as
shown.
a
d
c
a
e
b
50659
Page 40 of 90
a-Exhaust Pipe
b-Bolts and Thick Lockwashers (4)
c-Fiber Washers
d-Double-Wound Lockwashers
e-Locknuts
Installing Engine / Alignment
1. Attach a suitable sling to lifting eyes on engine and adjust so that engine is level when
suspended.
2. Lift engine into position (in boat), using an overhead hoist.
When lowering engine into position DO NOT set engine on shift cable. Shift cable
outer casing can be crushed causing difficult or improper shifting.
D7.3L D-TRONIC DIESEL ENGINES - BRAVO MODELS
CAUTION
b
a
76012
a-Front Engine Lifting Eye
b-Rear Engine Lifting Eye
c-Suitable Sling
c
76016
76021
Page 41 of 90
D7.3L D-TRONIC DIESEL ENGINES - BRAVO MODELS
3. Align rear engine mounts with inner transom plate mounts. Set engine onto front mounts
and inner transom plate mounts, while simultaneously aligning exhaust elbow with exhaust tube. (Do not relieve hoist tension.)nd
IMPORTANT: Engine attaching hardware must be installed in sequence shown.
4. Install both rear engine mounting bolts and hardware as shown. Torque to 35-40 lb-ft
(47-54 Nm).
a
f
b
a-Rear Engine Mount
b-Inner Transom Plate Mount
c-Bolt
d-Washer
e-Spacer
f-Fiber Washer
g-Double-Wound Lockwasher
c
d
e
g
22032
5. Relieve hoist tension and disconnect sling from engine lifting eyes.
NOTE: Installing Engine Lifting Eye Tool shown will help equalize load on hoist during alignment procedure.
6. Install lifting eye tool into metal bar with threaded hole near port end of engine oil cooler.
a
b
76021
a-Lifting Eye Tool
b-Threaded Hole
75956
71961
Page 42 of 90
D7.3L D-TRONIC DIESEL ENGINES - BRAVO MODELS
7. Attach chain and hooks from suitable engine sling to starboard front lifting eye and port
mounted Engine Lifting Eye Tool. Attach a suitable hoist to this sling.
NOTE: Installing sling between specified lifting eyes will help equalize load on hoist during
alignment procedure.
b
a
76012
71961
a-Engine Sling In Starboard Lifting Eye
b-Engine Sling In Port Mounted Engine Lifting Eye Tool
8. Align engine as follows:
a. Fold out perforated area in bell housing dust cover.
a
22027
a-Dust Cover
Page 43 of 90
D7.3L D-TRONIC DIESEL ENGINES - BRAVO MODELS
DO NOT use an alignment tool from another manufacturer. Alignment tools other
than Quicksilver Alignment Tool may cause improper alignment and damage to
gimbal bearing and/or engine coupler.
To avoid damage to gimbal bearing, engine coupler, or alignment tool:
DO NOT attempt to force alignment tool!
DO NOT raise or lower engine with alignment tool inserted (or partially inserted)
in gimbal bearing or engine coupler.
b. Attempt to insert the solid end of the alignment tool thru the gimbal bearing and into
the engine coupler splines.
c. If the tool does not fit, remove it and carefully raise or lower the front end of the en-
gine, as necessary, and attempt to insert the alignment tool.
d. Repeat step “c” until the alignment tool installs easily (SLIDES FREELY WITH TWO
FINGERS) all the way into and out of engine coupler splines. Do not check by turning.
CAUTION
CAUTION
a
b
d
c
22029
a
73345
a-Alignment Tool (Use Only Recommended Alignment Tool)
b-Insert This End Of Alignment Tool Through Gimbal Housing Assembly
c-Gimbal Bearing
d-Engine Coupler
73794
Page 44 of 90
D7.3L D-TRONIC DIESEL ENGINES - BRAVO MODELS
IMPORT ANT: Finished boat stringer must position engine so that a minimum mount
adjustment exists after front mount is adjusted down to stringer. This allows for future adjustments.
9. Adjust front mount assembly until it touches stringer.
10. Recheck alignment with alignment tool. Tool must enter coupler splines freely. If not,
readjust front mounts.
11. When alignment is correct, tighten locknut or nut with lockwasher on each mount se-
curely.
12. Bend tab washer down against flat on adjusting nut.
NOTE: Coat both nuts and threaded portion of mount with Perfect Seal if used in a saltwater
environment to reduce rust and ease of serviceability.
c
b
f
d
a
e
Typical
a-Slotted Hole Toward Front of Engine
b-Lock Nut
c-Bracket
d-Mount Adjustment Nut – turn left to lower, right to raise
e-Lag Screws (or Bolts)
f-Tab Washer
13. Remove alignment tool and fold bell housing dust cover flap back into place and tape
shut for boat shipment.
71969
Page 45 of 90
D7.3L D-TRONIC DIESEL ENGINES - BRAVO MODELS
Engine Connections
Quicksilver Seawater Pickup and Seacock
1. Drill a 2 in. (50mm) hole thru hull in appropriate location (Refer to “Installation Requirements.”).
2. Apply marine caulking (sealer) to mounting surface on seawater pickup (thru-hull fitting)
where hull contact will occur when installed.
3. Ensure slots in water pickup are facing forward and install water pickup. Position washer on fitting and install large nut. Tighten nut securely.
e
c
b
d
70355
a-Seawater Pickup (Thru-Hull Fitting)
b-Washer
c-Large Nut
d-Hull of Boat
e-Marine Caulking
f-Slots Facing Forward (Toward Bow of Boat)
4. Install seacock on seawater pickup. Tighten securely.
5. Install 1-1/2 in. (38mm) hose connector on seacock. Tighten securely.
e
f
a
a
f
70589
c
Page 46 of 90
a
b
70355
a-Seacock
b-Seawater Pickup (Thru-Hull Fitting)
c-1-1/2 in. (38mm) Hose Connector
IMPORTANT: Seawater hose used must be wire reinforced to avoid collapsing hose
when suction is created by seawater pump impeller.
70355
Seawater Strainer
When using a seawater strainer other than Quicksilver Seawater Filter (Part Number
35-801763739) refer to manufacturer’s instructions for installation, operation and maintenance.
Refer to the following when installing and connecting Quicksilver seawater strainer.
IMPORTANT: Read and observe the following:
Mount the seawater strainer in a vibration free location.
Never mount the seawater strainer on the engine.
Hoses must not be kinked.
Hoses must not allowed to come in contact with hot or moving parts on the
engine.
Seawater strainer must be mounted BELOW the level of the seawater pump.
1. Mount seawater strainer as specified.
2. Cut hoses to required length and make connections. Use double clamps on all hose con-
nections.
D7.3L D-TRONIC DIESEL ENGINES - BRAVO MODELS
g
c
f
e
50226
a-Seawater Pickup (Thru Hull Pickup Shown)
b-Seacock
c-Double Hose Clamps
d-Hose from Thru Hull Pickup To Seawater Strainer
e-Seawater Strainer (Below Seawater Pump Level)
f-Hose from Seawater Strainer To Seawater Pump
g-Seawater Pump
h-Strainer Below This Level
h
d
cc
c
b
a
70355
Page 47 of 90
D7.3L D-TRONIC DIESEL ENGINES - BRAVO MODELS
Closed Cooling Recovery Bottle
1. Connect plastic tubing (from kit) to bayonet fitting on heat exchanger . Secure with tubing
clamp provided.
2. Select a mounting location for coolant recovery bottle and mounting bracket that meets
all of the following:
a. Within limits of clear plastic tubing.
b. Below horizontal level of heat exchanger fill neck.
c. Accessible for observing coolant level and filling.
3. Mount coolant recovery bottle and mounting bracket in desired location, using two 3/4
in. long screws and flat washers.
4. Route plastic tubing to recovery bottle, making sure tubing is positioned away from any
moving parts. Cut plastic tubing, as required, and connect to bottom connection on recovery bottle and secure with tubing clamp provided.
5. Fasten plastic tubing to boat, as necessary, with the 2 hose clips and 1/2 in. long screws
provided.
d
c
a-Recovery Bottle and Mounting Bracket
b-Screws and Flat Washers
c-Plastic Tubing
d-Tubing Clamp
b
a
c
d
7054871712
Page 48 of 90
Fuel Lines
D7.3L D-TRONIC DIESEL ENGINES - BRAVO MODELS
1. Connect flexible fuel line to fuel supply fitting. Secure with hose clamp.
2. Connect flexible fuel line to fuel return fitting. Secure with hose clamp.
b
a
76027
a-Fuel Supply Fitting
b-Fuel Return Fitting
Power Steering Hydraulic Hoses
Route hoses exactly as shown below. This will help avoid stress on the hose fittings
and will help avoid kinks in the hose.
1. Connect power steering hoses to control valve. Position hoses as shown.
IMPORTANT: Make hydraulic connections as quickly as possible to prevent oil
leakage.
IMPORTANT: Be careful not to cross-thread or overtighten hose fittings.
CAUTION
a
b
a-Rear Fitting (Pressure Hose)
b-Front Fitting (Return Hose)
2. Torque fittings to 20 - 25 lb-ft (27 - 34 Nm).
3. Secure hoses to avoid contact with moving components.
71902
Page 49 of 90
D7.3L D-TRONIC DIESEL ENGINES - BRAVO MODELS
Exhaust System
1. Tighten exhaust tube hose clamps securely.
d
Typical
a-Elbow
b-Tube
c-Hose Clamps (4)
d-Pipe
c
a
b
76106
Electrical Connections
CONTINUITY CIRCUIT
1. Connect continuity circuit wire (supplied with engine package) from engine to transom
assembly. Tighten inner transom plate screw securely.
a-Flywheel Housing Screw / Stud
b-Continuity Circuit Wire
c-Inner Transom Plate Grounding Screw
a
c
b
74217
Page 50 of 90
INSTRUMENTS AND EXTENSION HARNESSES
NOTE: If using other than Quicksilver instrumentation and harnesses, refer to manufactur-
ers’ instructions.
1. Follow the appropriate instructions “a”, “b” and/or “c”, depending upon boat configura-
tion:
a. Prepare dash openings and/or mount gauges according to instructions provided
with individual gauges.
b. Prepare dash opening and/or mount Engine System Monitor Panel to dashboard fol-
lowing Instruction Sheet/Template 90-806330.
c. Extend wires through dash openings and/or connect all instrument wiring harness
leads to the individual gauges and Engine System Monitor Panel. Refer to Quicksilver Instrumentation Wiring Diagram, wire identification tags and instructions provided with individual gauges and kits.
2. The switch provided for the audio warning test and panel (dash) lights is a three-position
toggle switch. It must be wired and installed correctly to provide proper operation of the
systems. Refer to the following special installation instructions:
a. Hold the switch in your hand and press the switch toggle lever into its spring loaded
momentary position. You must install the switch so that the “spring loaded”, Audio
Test end of the switch is oriented DOWN once the panel is installed in the boat.
D7.3L D-TRONIC DIESEL ENGINES - BRAVO MODELS
IMPORTANT: The decal on the side of the switch with the arrow and the word “UP”
refer to the position of the switch
when installed on the panel
. The circled numbers
refer to wire terminals.
b. Install jamb nut, and then locking washer , on switch threaded portion. Secure to pan-
el using knurled nut. Tighten securely, to prevent switch from turning in hole. DO
NOT overtighten.
d
123
a
c
a
87-805675
UP
f
e
e
b
73369
UP
6
5
4
1
2
3
b
71886
Typical
a-Audio Test/Panel Light Switch
b-Spring-Loaded Audio Test Portion (Direction of Movement DOWN When
Installed)
c-Terminal Number(s)
d-Terminal(s)
e-Jamb Nut
f-Locking Washer
Page 51 of 90
D7.3L D-TRONIC DIESEL ENGINES - BRAVO MODELS
3. Refer to Quicksilver Instrumentation Wiring Diagram. Using screws provided, connect
the listed color coded wires to numbered switch terminals as shown.
Harness Wire (Color Code) Connect To: Terminal Number
16C BLACK (BLK)
40A YELLOW (YEL)
LT1 BLUE (BLU)
12C PURPLE (PPL)
4. Make sure that all instrument and switch connections are secure. Seal terminals with
Liquid Neoprene (92-25711).
5. Mount gauges according to instructions provided with individual gauges. Mount Engine
System Monitor Panel to dashboard following Instruction Sheet/Template.
6. Connect instrument extension harnesses to instrument harness ends. Connector
collars must be fully engaged and secure.
IMPORTANT: When routing any wiring extension harness back to the engine, make
sure that the harness does not rub or get pinched.
7. Route instrument extension harnesses back to engine. Fasten harnesses to the boat
at least every 18 in. (460 mm), using appropriate fasteners.
D7.3L D-Tronic
2
1
5
4
8. Connect extension harness to engine harness end on side of electrical bracket. Tighten
locking connector collar.
c
a
b
75337
76010
a-Extension Harness From Instruments
b-Engine Harness and Connector End
c-Electrical Bracket
Page 52 of 90
NEUTRAL SAFETY SWITCH CONNECTION
1. Connect neutral safety switch wires at instrument panel and remote control. Refer to ap-
propriate wiring diagram. Secure connections as shown and coat with Liquid Neoprene.
Slide rubber sleeve over connections.
D7.3L D-TRONIC DIESEL ENGINES - BRAVO MODELS
YEL/RED
c
YEL/RED
c
a-Instrument Harness Wires
b-Two Wire Connector
c-To Remote Control
d-Rubber Sleeves
TRIM POSITION SENDER CONNECTION
1. Connect trim position sender leads from gimbal housing to leads from engine harness.
a
a-From Engine Harness
b-From Gimbal Housing
MERCATHODE CONTROLLER
1. Connect electrical leads to controller assembly.
RED 36BC2
d
PUR 36BC3
YEL 107
BLK GND3
BLK
BLK
b
PUR 36BC1
a
PUR 36BC
a
b
24841
2. Apply a thin coat of Liquid Neoprene to ALL electrical connections.
a
75955
a-Controller Assembly Location
b-ORANGE Wire - From Electrode on Transom Assembly
c-RED/PURPLE Wire - Connect (Other End) to Positive (+) Battery Terminal
d-BLACK Wire - From Engine Harness
e-BROWN Wire - From Electrode on Transom Assembly
d
b
c
e
22232
Page 53 of 90
D7.3L D-TRONIC DIESEL ENGINES - BRAVO MODELS
Shift Cable Installation and Adjustment
NOTE: Shift Cable Adjustment Tool (91-12427) allows the shift cables to be installed and
adjusted, with or without the sterndrive attached.
IMPORTANT: The direction of propeller rotation (RH or LH) for this drive unit is determined by the following method.
1. Determine desired propeller rotation according to “a”, “b”, or “c”:
a. Bravo One/Two
lever is placed in Forward, remote control is setup for RIGHT HAND (RH)
propeller rotation.
b. Bravo One/Two
lever is placed in Forward, remote control is setup for LEFT HAND (LH)
propeller rotation.
- If shift cable end guide moves in direction “A”, when control
- If shift cable end guide moves in direction “B”, when control
A
B
Bravo One And Two
c. Bravo Three
propeller is always RH Rotation. Shift cable end guide must move in direction
“A”, when control lever is placed in Forward gear position.
- Front propeller on drive unit is always LH Rotation and rear
A
71656
71656
Bravo Three
IMPORTANT: When installing shift cables, be sure that cables are routed in such a
way as to avoid sharp bends and/or contact with moving parts. DO NOT fasten any
items to shift cables.
2. Install shift cable into remote control (refer to appropriate remote control instructions).
3. Loosen stud and move it to dimension as shown. Retighten stud.
b
a
23345
a-Stud
b-3 in. (76mm) - Center of Pivot Bolt to Center of Stud
Page 54 of 90
D7.3L D-TRONIC DIESEL ENGINES - BRAVO MODELS
4. Install drive unit shift cable.
a
b
c
23345
a-Washers (2)
b-Lock Nut - Tighten Until Contact, Then Back Off 1/2 Turn
c-Cotter Pin - Insert from Top and Spread Both Ends
5. Place adjustment tool over drive unit shift cable, as shown. Hold tool in place, using a
piece of tape over the barrel retainer.
6. Locate center of remote control and control cable play (backlash).
a. Shift remote control to neutral.
b. Push in on shift cable end with enough pressure to remove play, and mark position
“a” on tube.
c. Pull out on shift cable end with enough pressure to remove play, and mark position
“b” on tube.
d. Measure distance between marks “a” and “b” and mark position “c” half-way be-
tween marks “a” and “b.”
b
c
c
a
23242
22024
IMPORT ANT: Be sure to keep center mark “c” aligned with remote control shift cable
end guide edge when making the following adjustment.
Page 55 of 90
D7.3L D-TRONIC DIESEL ENGINES - BRAVO MODELS
7. Adjust remote control shift cable as follows:
a. Temporarily install shift cable end guide into shift lever, and insert anchor pin.
b. Adjust shift cable barrel so that hole in barrel centers with vertical centerline of stud.
Ensure that backlash center mark is aligned with edge of control cable end guide.
DO NOT attempt to install or remove remote control shift cable barrel from stud,
without first removing end guide anchor pin from shift lever, and removing cable.
Attempting to bend shift cable to install or remove barrel, will place undue stress
on cable end guide and shift lever, and damage to both could occur.
c. Remove shift cable end guide from shift lever, by removing anchor pin.
CAUTION
e
d
a-Control Cable End Guide
b-Anchor Pin
c-Backlash Center
d-Control Cable Barrel
e-Stud
8. Install remote control shift cable.
c
a
b
a-Lock Nut - Tighten Until Bottomed Out
b-Washers - Both Sides of Barrel
c-Anchor Pin
d-Cotter Pin (Not Visible) - Spread Both Ends
a
b
23242
c
d
23242
Page 56 of 90
9. Remove adjustment tool.
D7.3L D-TRONIC DIESEL ENGINES - BRAVO MODELS
10. Shift remote control lever into full forward position. Place end of adjustment tool in barrel
retainer.
RH ROT ATION BRAVO ONE, TWO, THREE AND BLACKHA WK MODEL: Rear slot in tool
should fit over shift lever stud.
LH ROTATION BRAVO ONE AND TWO: Forward slot in tool should fit over shift lever stud.
If slot does not fit over stud, loosen shift lever stud and slide stud either direction, until slot
in tool fits over stud. When adjustment is correct, retighten stud.
a
b
RH Rotation Bravo One, Two, Three
b
LH Rotation Bravo One And Two
a-Adjustment Tool
b-Barrel Retainer
c-Shift Lever Stud
d-Shift Lever Adjustment Slot
c
d
23242
a
c
d
23242
11. Remove adjustment tool.
12. Lubricate shift cable pivot points with 30W oil.
Page 57 of 90
D7.3L D-TRONIC DIESEL ENGINES - BRAVO MODELS
Troubleshooting Shift Problems
NOTE: The following information is provided to assist an installer in troubleshooting if hard
shifting or chucking/racheting is encountered when shifting into forward gear.
1. When installing the control box in the side panel of the boat, make sure that the cables
have enough clearance to operate. This is necessary because the cables move up and
down when the shift handle is moved. If the control box is mounted too far back toward
any fiberglass structure, the cables will be interfered with; this will cause very hard shifting.
NOTE: The control box housing can be rotated in 30° increments to improve cable routing.
74688
Proper Cable Bend
74689
Improper Cable Bend
2. Ensure that when the shift cable from the control box is led through the side gunnel of
the hull, it does not have any extremely sharp bends in it as this will cause stiff shifting.
3. Before installing the shift cable into the control box, extend the stainless rod eye end of
the cable and grease it with 2-4-C Marine Lubricant with Teflon. Move it back and forth
to allow even distribution of the grease.
Page 58 of 90
22005
D7.3L D-TRONIC DIESEL ENGINES - BRAVO MODELS
4. Do not strap or clamp the control cables to any other cables or rigid structure within three
feet of the control box.
5. Be sure the cable is not permanently kinked.
6. Make sure there is proper clearance for cable movement when the control box is
installed in the side panel. The cables must have room to move up and down when the
control handle is shifted into either forward or reverse.
7. Check to make sure that the engine was not set down on the intermediate shift cable
during installation, as this will crush the inner cable tubing and cause improper and / or
stiff shifting.
8. DO NOT fasten the shift cable with straps or clamps to any other cable within five feet
of the shift plate.
9. DO NOT fasten the shift cable to the transom with any type of plastic clips or fasteners
within five feet of the shift plate.
10. DO NOT overtighten the throttle or shift cable attaching nuts at the engine end. Barrel
and cable end must be free to rotate on the mounting stud.
Page 59 of 90
D7.3L D-TRONIC DIESEL ENGINES - BRAVO MODELS
Throttle Cable Installation and Adjustment
IMPORT ANT: When installing throttle cables, be sure that cables are routed in such a way as to avoid
sharp bends and/or avoid contact with moving parts. DO NOT fasten any items to throttle cables.
1. Place remote control lever(s) in neutral/idle position.
2. Measure between the center of the Accelerator Position Sensor anchor stud to the holes
on the cable barrel end bracket. Select the hole in the cable barrel end bracket that
is closest to the distance of 7-1/8 in. (181 mm) between studs.
e
b
a
c
d
76025
a-Accelerator Position Sensor (APS/IVS)
b-APS/IVS Anchor Stud
c-Cable Barrel End Bracket
d-Cable Barrel Anchor Stud
e-7-1/8 in. (181 mm)
3. Install cable end guide on throttle lever, then push cable barrel end lightly toward throttle
lever end.
moving remote control lever).
bracket. Ensure hole in barrel positions cable as shown. Install cable and secure with
hardware as shown.
(This will place a slight preload on shift cable to avoid slack in cable when
Adjust barrel on throttle cable to align with stud in anchor
Page 60 of 90
D7.3L D-TRONIC DIESEL ENGINES - BRAVO MODELS
b
Single Cable Shown (Dual Similar)
a-Accelerator Position Sensor (APS/IVS)
b-APS/IVS Anchor Stud
c-Cable Barrel End Bracket
d-Cable Barrel Anchor Stud
a
c
a
d
76025
c
b
c
a-Throttle Cable End Guide
b-Cable Barrel
c-Anchor Stud
d-Flat Washer and Locknut
e-Spacer - With Dual Cables
f-Cable Barrel Locations - With Dual Cables
4. Tighten locknuts until they bottom and back off 1/2 turn.
5. Place remote control lever in full forward wide-open-throttle (W.O.T.) position.
6. Check to ensure Accelerator Position Sensor lever is contacting internal “override”
spring. Be certain that the cable is not causing the Accelerator Position Sensor to be
“over-pulled”. Check to ensure that remote control and cable are providing proper output.
7. Place remote control lever in neutral/idle position and, if necessary, readjust throttle
cable barrel.
8. Recheck that (when operated) Accelerator Position Sensor lever contacts internal over-
ride spring, indicating “W.O.T.” (Wide Open Throttle) or 100% throttle position.
d
e
e
d
Page 61 of 90
D7.3L D-TRONIC DIESEL ENGINES - BRAVO MODELS
Sterndrive Unit Installation
1. Remove trim cylinders’ support and dust cover from bell housing studs. Retain locknuts
and flat washers.
2. Remove cap and fill gear lube monitor.
a-Gear Lube Monitor
b-Cap
b
a
75955
3. Push in on dribble valve until gear lube appears.
a-Dribble Valve
4. Once gear lube appears, release dribble valve.
5. Fill monitor to FILL mark.
a
72471
Page 62 of 90
6. Replace monitor cap.
D7.3L D-TRONIC DIESEL ENGINES - BRAVO MODELS
7. Coat studs with 2-4-C Marine Lubricant with Teflon.
a
72471
a-Studs (6)
8. Lubricate U-joint shaft splines and U-joint shaft O-rings with Engine Coupler Spline
Grease.
Typical
a-Splines
b-O-rings
b
a
22026
Page 63 of 90
D7.3L D-TRONIC DIESEL ENGINES - BRAVO MODELS
9. Check drive shaft bellows for cleanliness and absence of debris.
a-Driveshaft Bellows
10. Lubricate O-ring seals with 2-4-C Marine Lubricant with Teflon.
a
72472
a
72183
a-O-Ring Seals
11. Pull out shift linkage as far as it moves. “Jaws” will open, as shown.
a
72460
a-Shift Linkage
IMPORTANT: As sterndrive is inserted into drive unit, entry of the bell housing shift
cable must be closely checked to make sure cable enters the “jaws” of shift linkage
assembly in the sterndrive.
Page 64 of 90
D7.3L D-TRONIC DIESEL ENGINES - BRAVO MODELS
12. Place Remote Control in neutral position.
NOTE: As bell housing shift cable enters the shift linkage assembly, it pushes the assembly
back into the sterndrive housing, and the “jaw” closes, securing the cable, as shown in steps
“A”, “B” and “C”.
A
B
C
72467
IMPORT ANT: If Bell Housing Shift Cable (b) does not line up to properly enter “jaws”
of shift linkage assembly (a), cable will have to be aligned manually.
b
a
72457
a-Shift Linkage Assembly
b-Shift Cable
13. Place drive shaft housing in position on bell housing and install drive unit, as follows:
a. Position trim cylinders so they point straight backwards.
b. Position drive unit so that universal joint shaft aligns with bell housing bore.
c. Guide U-joint shaft through bearing in gimbal housing and into engine coupler. Make
sure that shift linkage “jaws” engage the bell housing shift cable assembly.
d. If necessary, rotate propeller shaft counterclockwise slightly (using a propeller) to
align U-joint shaft splines with splines in engine coupling, then slide drive unit all the
way into bell housing.
Page 65 of 90
D7.3L D-TRONIC DIESEL ENGINES - BRAVO MODELS
14. Secure drive unit to bell housing with 5 flat washers and 6 locknuts. Torque to 50 Ib. ft.
(68 N⋅m).
a-Do Not Install Flat Washer Here
b-Elastic Stop Nuts (6) and Flat Washers (5)
IMPORTANT: On Bravo One, Two and Three Models, the “Trim-In Limit Pin Insert”
must be properly positioned before installing the trim cylinder anchor pin in the following steps.
b
a
71244
15. Ensure that the Trim-In Limit Pin Insert is positioned as shown for the appropriate Bravo
model.
a
75157
Bravo One and Two (Insert Positioned Forward)
a
Page 66 of 90
75158
Bravo Three (Insert Positioned Aft)
a-Trim-In Limit Pin Insert
D7.3L D-TRONIC DIESEL ENGINES - BRAVO MODELS
IMPORTANT: The position of the Trim-In Limit Pin on the Bravo Three sterndrive unit
should only be changed after the boat has been properly tested. Refer to statement
at the front of this manual entitled; “Bravo Three Notice: Trim-In Limit Pin”.
IMPORT ANT: T o aid in installing rubber bushings, use a water and soap solution. DO
NOT use oil or grease.
16. Install trim cylinders on aft end of drive unit with hardware as shown. Coat anchor pin
threads with 2-4-C Marine Lubricant with Teflon and tighten nuts until they bottom. Install
plastic caps and tighten hand tight only.
b
c
c
a
c
71668
a-Aft Anchor Pin
b-Large l.D. Flat Washers (2)
c-Rubber Bushings (4)
d-Small l.D. Flat Washers (2)
e-Locknuts (2)
f-Plastic Caps (2)
17. Place drive unit serial number decal as described in “General Information”.
e
d
f
71669
Page 67 of 90
D7.3L D-TRONIC DIESEL ENGINES - BRAVO MODELS
18. On All Drive Units - Perform steps 19 through 21.
19. Raise drive to gain access to area between gimbal housing and sterndrive, immediately
atop the transom end of the anti-ventilation plate.
20. Insert speedometer tube fitting into opening on topside of anti-ventilation plate, in position shown.
a
b
a-Tube Fitting
b-Opening
21. With fitting fully seated, turn handle to left to a tightly seated position, as shown.
a
a-Handle
22025
22025
Page 68 of 90
Predelivery Preparation
Before starting Predelivery read “General Information” and “Installation Requirements”
completely.
Battery Connection
IMPORTANT: Engine electrical system is negative (–) ground.
1. Connect engine positive (+) battery cable (usually RED) to positive (+) battery terminal.
2. Connect engine negative (–) battery cable (usually BLACK) to negative (–) battery termi-
nal.
3. Connect Power T rim pump BLACK (–) battery cable to negative (–) battery terminal and
pump RED (+) battery cable to positive (+) battery terminal.
4. Make sure that all battery terminal connections are tight, then spray terminals with a bat-
tery connection sealant to help retard corrosion.
Power Trim Pump
IMPORTANT: Check oil level with sterndrive unit in the full DOWN/IN position.
D7.3L D-TRONIC DIESEL ENGINES - BRAVO MODELS
NOTICE
IMPORTANT: Use Quicksilver Power Trim and Steering Fluid, or SAE 10W-30 or
10W-40 engine oil in trim system.
1. Unscrew fill cap and remove
caplug from fill neck and discard. Replace fill cap.
a
50630
a-Caplug
2. Raise and lower drive unit (to the full UP/OUT position) 6 to 10 times to purge air from
system. Check oil level visually, (with drive unit in the full DOWN/IN position). Oil level
should be maintained at bottom lip of fill neck.
Page 69 of 90
D7.3L D-TRONIC DIESEL ENGINES - BRAVO MODELS
a-Fill Neck
3. Check all trim line connection points for leaks. If fluid is visible at fittings, tighten fitting(s).
Torque fitting(s) to 100-150 lb-in. (11-16 Nm).
a
22031
Trim Position Sender Adjustment
1. Loosen both trim position sender attaching screws.
b
a-Attaching Screws
b-Trim Position Sender
a
71220
Page 70 of 90
CAUTION
DO NOT start engine in the following step or damage to drive unit and engine could
result from lack of cooling water.
2. Turn ignition key to RUN position.
3. Trim drive unit to the full DOWN/IN position.
D7.3L D-TRONIC DIESEL ENGINES - BRAVO MODELS
4. Rotate trim position sender as required to show full DOWN/IN position on dashboard
instrument as shown.
a
71671
a-Trim Gauge Needle
5. Tighten retaining screws and turn ignition key to the “OFF” position.
b
a-Retaining Screws
b-Trim Position Sender
a
71220
Page 71 of 90
D7.3L D-TRONIC DIESEL ENGINES - BRAVO MODELS
Power Steering Fluid
IMPORT ANT: Use only Quicksilver Power Trim and Steering Fluid, or Dexron III automatic transmission fluid (ATF), in power steering system.
DO NOT RUN POWER STEERING DRY, or pump will be damaged.
1. Position drive unit so that it is straight back.
2. Remove fill cap from power steering fluid reservoir, and check fluid level. Fill to “FULL
COLD” line – do not over fill.
CAUTION
a
a
b
71672
a-Power Steering Fluid Reservoir
b-Cap/Dipstick
c-FULL COLD Mark
Drive Unit Gear Lube Monitor
IMPORTANT: Oil level in monitor will rise and fall during drive operation; always
check oil level when drive is cool and engine is shut down.
76955
a
75955
Page 72 of 90
a-Gear Lube Monitor
D7.3L D-TRONIC DIESEL ENGINES - BRAVO MODELS
1. With drive in full down position, remove oil vent screw.
CAUTION
Failure to fill drive unit to level of vent hole will result in a low drive oil level. Gear
lube monitor only MAINTAINS drive oil level and will not correct an improperly filled
drive unit.
2. Fill gear lube monitor with Quicksilver Gear Lube. When oil starts to run out the oil vent
hole, reinsert oil vent screw, and sealing washer, and tighten securely.
3. Fill monitor to “FILL” mark. Lubricate O-ring in cap with sterndrive oil, to insure ease of
installing and removing cap, and install cap. Do not over-tighten cap.
4. Recheck oil level after first use.
b
a-Oil Vent Screw and Sealing Washer
b-Oil Vent Hole
Propeller Installation
BRAVO ONE AND TWO
IMPORTANT: Correct rotation propeller MUST match direction of rotation of propeller
shaft.
Be sure that remote control is in neutral position and ignition key is removed from
switch prior to installing propeller.
Place a block of wood between the anti-ventilation plate and propeller to protect
hands from propeller blades and to prevent propeller from turning when tightening
propeller nut.
1. To aid in future removal of the propeller, liberally coat propeller shaft splines with one
of the following Quicksilver lubricants.
a
70121
WARNING
WARNING
• Special Lubricant 101
• 2-4-C Marine Lubricant with Teflon
IMPORTANT: Installation is correct when at least 2 threads of propeller shaft are exposed through propeller nut after torquing it.
Page 73 of 90
D7.3L D-TRONIC DIESEL ENGINES - BRAVO MODELS
2. Install propeller with attaching hardware as shown. Tighten nut a minimum of 55 lb-ft (75
Nm), then continue to tighten until 3 tabs on the tab washer align with grooves on spline
washer. Bend the 3 tabs down into grooves.
a
b
c
Bravo One
a-Forward Thrust Hub
b-Flo-Torque Drive Hub
c-Propeller
d-Continuity Washer
e-Drive Sleeve Adapter
f-Tab Washer
g-Locknut
d
e
g
f
h
75492
a
b
Page 74 of 90
Bravo Two
a-Apply Lubricant on Splines of Propeller Shaft
b-Forward Thrust Hub
c-Propeller
d-Continuity/Spline Washer
e-Tab Washer
f-Locknut
d
c
e
f
70561
BRAVO THREE
D7.3L D-TRONIC DIESEL ENGINES - BRAVO MODELS
IMPORTANT: Correct rotation propeller MUST match direction of rotation of propeller
shaft.
WARNING
Be sure that remote control is in neutral position and ignition key is removed from
switch prior to installing propeller.
WARNING
Place a block of wood between the anti-ventilation plate and propeller to protect
hands from propeller blades and to prevent propeller from turning when tightening
propeller nut.
1. T o aid in future removal of the propeller, liberally coat the propeller shaft splines with one
of the following Quicksilver lubricants.
• Special Lubricant 101
• 2-4-C Marine Lubricant with Teflon
2. Install propellers with attaching hardware as follows:
a. Slide forward thrust hub onto propeller shaft, with tapered side toward propeller hub.
b. Align splines and place front propeller on propeller shaft.
c. Install front propeller locknut. Torque to 100 lb-ft (136 N⋅m).
d. Slide aft thrust hub onto propeller shaft with tapered side toward propeller hub.
e. Align splines and install aft propeller.
f. Install propeller locknut. Torque to 60 lb-ft (81 N⋅m).
f
e
d
c
b
a
72239
Bravo Three
a-Rear Propeller Locknut
b-Rear Propeller
c-Rear Propeller Thrust Hub
d-Front Propeller Locknut
e-Front Propeller
f-Front Propeller Thrust Hub
Page 75 of 90
D7.3L D-TRONIC DIESEL ENGINES - BRAVO MODELS
Test Running Engine
Electrical system components on this engine are not external ignition protected.
DO NOT STORE OR UTILIZE GASOLINE ON BOATS EQUIPPED WITH THESE ENGINES, UNLESS PROVISIONS HAVE BEEN MADE TO EXCLUDE GASOLINE VAPORS FROM ENGINE COMPARTMENT (REF: 33 CFR). Failure to comply could result in fire, explosion and/or severe personal injury.
If engine is to be tested with boat out of water, the propeller must be removed to
avoid injury.
IMPORTANT: If engine is to be tested on land, water must be supplied to seawater
pickup pump. DO NOT run engine above 1500 rpm, as suction created could cause
water hose to collapse causing water supply to be cut off.
1. If engine is to be tested on land, supply water to seawater pump.
WARNING
WARNING
merCruiser
a
861606
a-Seawater Pump
WARNING
Do not leave helm unattended when making test with boat in the water.
2. Check to ensure that cooling system drain plugs, petcocks, and hoses are installed and
tight.
NOTE: Refer to “Operation, Maintenance and Warranty Manual” for operating specifications and fluid capacities.
3. Check closed cooling system fluid level.
4. Check crankcase oil level.
5. Check sterndrive unit oil level.
Page 76 of 90
6. Check drive belt tension.
7. Test Audio Warning System.
D7.3L D-TRONIC DIESEL ENGINES - BRAVO MODELS
8. Refer to “Operation and Maintenance Manual” and start engine. Run at idle rpm until
water temperature is normal.
9. Watch all gauges for normal readings.
10. Turn steering wheel starboard, then port, and check to ensure drive unit turns the correct
way.
11. Inspect engine compartment for water, oil, fuel and exhaust leaks.
12. Check for lugging condition.
a. Turn steering wheel left until it stops, and continue to apply pressure. If pump lugs
(engine rpm dr ops and/or power steering pump tone changes), check the following:
(1.)Check for an obstruction between gimbal ring and gimbal housing and all moving
steering components.
(2.)Check that steering lever is not contacting cutout in transom. If contact is being
made, modify cutout.
b. Turn steering wheel right until it stops, and continue to apply pressure. If pump lugs
(engine rpm dr ops and/or power steering pump tone changes), check the following:
(1.)Check same items as (1) and (2) above.
(2.)Check steering cable end dimension with cable FULLY EXTENDED. (See “In-
stallation Requirements” for proper steering cable dimensions.)
13. Turn off engine. Lubricate steering cable and clevis with Special Lubricant 101.
IMPORTANT: Make sure the cable end that enters clevis is heavily lubricated with
Special Lubricant 101.
b
a
d
c
71904
a-Steering Cable End
b-Clevis
c-Clevis Pins and Cotter Pins
d-Steering Lever
Page 77 of 90
D7.3L D-TRONIC DIESEL ENGINES - BRAVO MODELS
14. Restart engine and observe drive unit. If drive unit creeps, an external tension may exist
on steering cable. Ensure that there is nothing attached to steering cable casing. Cable
must be free to move when actuated.
15. Check power steering pump fluid level:
a. Position drive unit so it is straight back. Turn off engine.
b. Remove cap/dipstick from power steering fluid reservoir. Check fluid level and add
as necessary. Do not overfill.
a
a
b
c
71672
a-Power Steering Fluid Reservoir
b-Cap/Dipstick
c-FULL COLD Mark
76955
Page 78 of 90
Boat-In-The-Water Tests
IMPORTANT: Engine alignment MUST BE CHECKED with boat in the water, fuel tanks
filled, and with a normal load onboard.
IMPORTANT: DO NOT perform the following with boat in a test tank or tied to dock.
ENGINE INITIAL BREAK-IN PROCEDURE
It is especially important that the following procedure be used on new diesel engines. This
break-in procedure allows the proper seating of the pistons and rings, which greatly reduces
the likelihood of low hour problems.
D7.3L D-TRONIC DIESEL ENGINES - BRAVO MODELS
IMPORT ANT: It i s recommended that the boat not
dure has been completed.
Initial Break-In Procedure is as follows:
1. Start engine and run at idle until coolant has reached minimum operating temperature
2. Run engine in gear for 3 minutes at each of the following rpms: 1200 rpm, 2400 rpm and
3. Run engine in gear for 3 minutes at each of the following rpms: 1500 rpm, 2800 rpm and
4. Run engine in gear for 3 minutes at each of the following rpms: 1800 rpm, 3000 rpm and
MAXIMUM RPM TEST
Power package should be equipped with a propeller that will allow engine to operate at its
specified maximum wide-open-throttle revolutions per minute (rpm), with an average load
aboard the boat. Best all around performance is obtained with the D7.3L D-Tronic engine
propped at 3800 rpm and the D7.3L D-Tronic engine propped at 3600 rpm.
IMPORTANT: Consider this additional information:
The engines listed in the following chart are equipped with an electronic device that
limits engine rpm. Be sure that propeller being used does not allow engine to run
against the device, as a significant loss in performance will result.
° F (65° C).
150
3000 rpm.
3400 rpm.
Maximum Rated Full-Throttle rpm.
be accelerated hard until this proce-
Engine rpm
MCM Model
Engine Recommended
Operating rpm Range
Engine rpm Limiter Setting
(Begins At:)
D7.3L D-Tronic 3600-3800 3850
D7.3L D-Tronic LD 3400-3600 3650
To check that the correct propeller has been installed, operate the boat with a light load (one
person, fuel tank half full) at wide-open-throttle and optimal trim. (Optimal trim is the point
where boat speed no longer increases when trimming-out. High rpm caused by excessive
trimming should not be used when checking for correct propeller.) rpm should be near the
top of specified range so that under a heavy load, engine speed will not fall below specifications. If engine speed is too high, replace propeller with one that has a higher pitch. If engine
speed is too low, replace with a lower pitch propeller. Generally, there is a 200 rpm change
between propeller pitches.
If a propeller cannot be obtained that will place the engine in the proper rpm range, it may
be necessary to have the propeller reworked at a propeller repair station.
Page 79 of 90
D7.3L D-TRONIC DIESEL ENGINES - BRAVO MODELS
IMPORT ANT: To run engine at maximum rpm before the Engine 20-Hour Break-In Period is complete, follow this procedure only after the Engine Initial Break-in Procedure has been completed:
1. Complete Engine Initial Break-In Procedures if not already accomplished.
2. Start engine and run at idle rpm until normal operating temperature is reached.
3. Run boat up on plane.
4. Advance engine rpm (in 200 rpm increments) until engine reaches its maximum rated
rpm. If maximum rated rpm is not possible or engine runs against governor refer to preceding information for correct propeller selection.
IMPORTANT: Do not run at maximum rpm for more than 2 minutes.
After Running Engine
If Power Package will not be used for an extended period of time, or will be exposed
to freezing temperatures, drain water from seawater cooling system, as explained
in owner’s “Operation, Maintenance and Warranty Manual.” Water MUST BE
drained to prevent corrosion and freeze damage to engine.
1. If Power Package will not be used for an extended period of time, or will be exposed to
freezing temperatures, drain water from seawater cooling system.
CAUTION
CAUTION
Sterndrive unit should be stored in full “down” position. Universal Joint bellows
may develop a “set” if unit is stored in raised position and may fail when unit is returned to service.
2. If power package is to be stored, position sterndrive unit full “DOWN/IN”.
Page 80 of 90
D7.3L D-TRONIC DIESEL ENGINES - BRAVO MODELS
Cold Weather or Extended Storage Draining Instructions
CAUTION
If Power Package will not be used for an extended period of time or will be exposed
to freezing temperatures, drain water from seawater section of cooling system.
Water MUST BE drained to prevent corrosion and freeze damage to engine.
CAUTION
If boat is to remain in the water, seacock, if so equipped, must remain closed until
engine is to be restarted to prevent water from flowing back into seawater cooling
system. If boat is not fitted with a seacock, water inlet hose must be disconnected
and plugged to prevent water from flowing into cooling system and/or boat. As a
precautionary measure, attach a tag to the ignition switch or steering wheel with the
warning that the seacock must be opened or the water inlet hose reconnected prior
to starting the engine.
IMPORTANT: Mercury MerCruiser recommends that propylene glycol antifreeze (a
nontoxic and environmentally safe) antifreeze be used in seawater section of the
cooling system for cold weather or extended storage. Make sure 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.
IMPORTANT: Observe the following information to ensure complete draining of cooling system:
• Engine must be as level as possible.
• A wire should be repeatedly inserted into all drain holes to ensure there are no
obstructions in passages.
IMPORTANT: Drain seawater section of closed cooling system only.
Page 81 of 90
D7.3L D-TRONIC DIESEL ENGINES - BRAVO MODELS
1. Close seacock, if so equipped, or disconnect and plug seawater inlet hose, if boat is to
remain in the water.
2. Remove and drain the following:
a. The end covers from both the port and starboard sides of heat exchanger. Drain tank
completely.
IMPORT ANT: Use compressed air to blow any remaining water from the tubes in the
heat exchanger.
b. The drain plug on the lower side of the engine oil cooler.
c. The aftercooler drain plugs located on the starboard and port aftercooler side
covers.
NOTE: Only the port aftercooler side cover is shown. Starboard is similar.
d. Disconnect seawater outlet hose at bottom of exhaust elbow . Lower hose and drain
completely.
b
71870
c
76122
76075
d
a
a
76106
Page 82 of 90
76186
a-End Covers
b-Oil Cooler Drain Plug
c-Aftercooler Drain Plugs (Port and Starboard)
d-Seawater Outlet Hose
D7.3L D-TRONIC DIESEL ENGINES - BRAVO MODELS
3. Repeatedly clean out drain holes using a stiff piece of wire. Do this until entire system
is drained.
4. Remove seawater pump outlet hose from top of seawater pump and drain.
b
a
76107
a-Seawater Pump
b-Outlet Hose
CAUTION
Avoid water entering boat. Do not unplug or disconnect seawater inlet hose unless
a seacock is present and it is closed.
5. Remove hose(s) at seawater strainer and drain hose(s) completely. Remove drain plug
and empty seawater strainer. Reconnect hoses. Tighten hose clamps securely. Install
drain plug. Tighten securely.
c
a
c
b
71362
a-Seawater Strainer
b-Drain Plug
c-Hose
6. After seawater section of cooling system has been drained completely, coat threads of
drain plugs with Perfect Seal and reinstall. Tighten securely. Connect hose to seawater
pump outlet (top). Tighten hose clamps securely. Replace end cover gaskets and seals,
if worn or deteriorated. Install end cover assemblies on the heat exchanger. Torque the
end covers to 120-132 lb-in. (14-15 Nm).
Page 83 of 90
D7.3L D-TRONIC DIESEL ENGINES - BRAVO MODELS
Power Trim System Wiring Diagram
a-20 Amp Fuse
b-Ground Bolt (Floor Mount)
c-“UP” Solenoid
d-110 Amp Fuse
e-“DOWN” Solenoid
f-Trailer Switch
g-Neutral Switch to Instrument Wiring Harness
h-Trim Limit Switch
b
a
c
d
f
e
g
BLK = BLACK
BLU = BLUE
BRN = BROWN
h
GRY = GRAY
GRN = GREEN
ORN = ORANGE
PNK = PINK
PUR = PURPLE
RED = RED
TAN = TAN
WHT = WHITE
YEL = YELLOW
LT OR LIT = LIGHT
DRK = DARK
73962
Page 84 of 90
MerCathode System Wiring Diagram
a-Controller
b-20 Amp Fuse
c-Electrode
a
D7.3L D-TRONIC DIESEL ENGINES - BRAVO MODELS
b
BLK = BLACK
BLU = BLUE
BRN= BROWN
GRY= GRAY
GRN= GREEN
ORN= ORANGE
PNK= PINK
PUR= PURPLE
RED= RED
TAN = TAN
WHT= WHITE
c
YEL = YELLOW
LT OR LIT=LIGHT
DRK= DARK
73596
Page 85 of 90
D7.3L D-TRONIC DIESEL ENGINES - BRAVO MODELS
Quicksilver Instrumentation Wiring
1
15
10
2
3
14
4
5
6
a
13
BLK = Black
BLU = Blue
BRN = Brown
GRY = Gray
GRN = Green
ORN = Orange
PNK = Pink
PUR = Purple
RED = Red
TAN=Tan
WHT = White
YEL = Yellow
LIT = Light
DRK = Dark
Page 86 of 90
12
b
c
d
e
7
8
11
9
D7.3L D-TRONIC DIESEL ENGINES - BRAVO MODELS
1-Voltmeter Gauge
2-Tachometer Gauge
3-Water Temperature Gauge
4-Oil Pressure Gauge
5-Trim Gauge
6-Engine System Monitor Panel
a - Check Engine Light
b - Engine Coolant High Temperature / Low Gear Lube Monitor Light
c - Oil Pressure Warning Light
d - Charge Indicator Light
e - Preheat Indicator Light
7-Panel Lights/Audio Warning Test Switch
8-Key Switch
9-Neutral Start Safety Circuit / Remote Control
10 - Hour Meter Gauge (Optional)
11 - Audio Warning Horns
12 - Diagnostic Tool Connection
13 - Instrument Harness Connector
14 - Wait-To-Start Relay
15 - Fuel Gauge (Optional)
Note 1: Connect these wires together with a screw and nut. Coat with Liquid Neoprene and
slide rubber sleeve over connection.
Page 87 of 90
D7.3L D-TRONIC DIESEL ENGINES - BRAVO MODELS
Cooling System Flow Diagram
a
2
1
8
9 10
7
3
5
4
6
H
c
b
B
D
E
B
C
D
F
A
G
76205
Page 88 of 90
SEAWATER COOLING CIRCUIT (RAW WATER)
1 - Seawater Inlet
2 - Seawater Strainer
3 - Seawater Pump
4 - Aftercooler
5 - Engine Oil Cooler
6 - Heat Exchanger (Seawater Circuit)
7 - Power Steering Fluid Cooler
8 - Exhaust Pipe Water Jacket
9 - Seawater Outlet (Exhaust)
10- Seawater Outlet (Thru-Transom)
CLOSED COOLING CIRCUIT (FRESH WATER/COOLANT)
A- Circulating Pump - Closed Coolant
B- Exhaust Manifolds
C- Engine Crankcase
D- Cylinder Heads
E- Turbocharger
F- Thermostat
G- Bypass
H- Heat Exchanger (Closed Cooling Circuit)
D7.3L D-TRONIC DIESEL ENGINES - BRAVO MODELS
FLOW OF :
a
ENGINE AIR
b
ENGINE OIL
c
POWER STEERING FLUID
Page 89 of 90
D7.3L D-TRONIC DIESEL ENGINES - BRAVO MODELS
Predelivery Inspection
Not Check/
Applicable Adjust
CHECK BEFORE RUNNING ON THE WATER TEST
Drain plug in and petcocks Engine alignment (Inboards only)
closed
Seawater inlet valve open Starter neutral safety
Engine mounts tight
Engine alignment
Drive unit fasteners torqued
Power trim cylinders fasteners
tight Oil leaks
Battery fully charged and secured
All electrical connections tight
Exhaust system hose clamps
tight Ignition timing
All fuel connections tight
Correct rotation propeller
(installed and torqued)
Throttle, shift and steering system Forward - Neutral - Reverse
fasteners tightened properly gear operation
Throttle plates open and close Steering operation throughout
completely range
Crankcase oil level Acceleration from idle rpm
Power trim oil level WOT RPM within
Stern drive unit oil level
Power steering fluid level
Closed cooling level
Transmission fluid level
Alternator belt tension
Seawater pickup pump belt
tension
Power steering pump belt tension leaks
Not Check/
Applicable Adjust
switch operation
Water pump operation
Instruments(s) operation
Fuel leaks
Water leaks
Exhaust leaks
Idle RPM, within specifications
specifications (in forward gear)
Power trim operation
Trim tab adjustment
Boat handling
AFTER ON WATER TEST
Propeller nut torque
Fuel, oil, coolant, water and fluid
Page 90 of 90
Audio warning system operation Oil and fluid levels
Apply Quicksilver Corrosion Guard to
engine package
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