Northern Lights M673M, M673D, M673L Operator's Manual

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Page 1

OPERATOR’S

MANUAL

Publication #OM673 for models:

M673M, M673D, and M673L

Page 2

— CALIFORNIA —

Proposition 65 Warning:

Diesel engine exhaust and some of its constituents

are known to the State of California to cause

cancer, birth defects, and other reproductive harm.

Alaska Diesel Electric, Inc.

4420 14th Avenue N.W. P.O. Box 70543 Seattle, WA 98107 Tel: (206) 789-3880 Fax: (206) 782-5455

Copyright ©2003 Alaska Diesel Electric, Inc. All rights reserved. Alaska Diesel Electric™, the Alaska Diesel Electric logo, Northern Lights™, and the Northern Lights logo are all trademarks of Alaska Diesel Electric, Inc.

Printed in U.S.A. PART NO.: OM673 8/03

Page 3

OPERATOR'S MANUAL

Read this operator's manual thoroughly before starting to operate your equipment.

This manual contains information you will need to run and service your new unit.

Table of Contents

for Models

M673M, M673D, and M673L

INTRODUCTION ................................................... 2

Models Included ................................................ 2

Model Numbers................................................. 2

Serial Numbers .................................................. 2

WARRANTY ........................................................... 3

SAFETY RULES .................................................... 3

COMPONENT LOCATIONS

M673 Marine Generator.................................... 4

PANELS

Northern Lights Generator Sets...................... 5-6

OPERATING PROCEDURES

Break-in Period ................................................. 7

Before Starting .................................................. 7

Starting .............................................................. 7

Operating ........................................................... 7

Stopping ............................................................ 7

Shutdowns and Alarms...................................... 8

Spare Parts......................................................... 8

SERVICING (

Fuels - General ................................................ 13

Fuel Filters....................................................... 13

Bleeding the Fuel System................................ 14

Injector Service ......................................... 15-16

Injection Pump ................................................ 16

Cooling System - General ............................... 16

Cooling System Flushing ................................ 17

Heat Exchanger ............................................... 17

Raw Water Pump ............................................ 17

Generator Ends ................................................ 17

Electrical System - General............................. 19

Glow Plugs ...................................................... 18

Booster Batteries ............................................. 18

Battery Care..................................................... 18

Winterizing / Out-of-Service........................... 18

AC GENERATOR - TF-276M/ TF-276D

General ............................................................ 19

Connections ..................................................... 20

Operation ......................................................... 21

Maintenance .............................................. 21-22

CONTINUED)

SERVICING SCHEDULE CHART .................9-10

SERVICING

Lubrication - General ...................................... 11

Checking Oil ................................................... 11

Oil Changes ..................................................... 11

Changing Oil Filter.......................................... 11

Air Filter .......................................................... 12

V-Belts ............................................................ 12

Retightening Cylinder Head Bolts .................. 12

Valve Clearances............................................. 12

Proprietary Information

This publication is the property of Alaska Diesel Electric, Inc.

It may not be reproduced in whole or in part without the written permission of Alaska Diesel Electric, Inc.

OM673 08/03

TROUBLESHOOTING

Electrical.......................................................... 23

Engine........................................................ 24-26

DATA SHEETS

Marine ....................................................... 27-28

WIRING DIAGRAMS

DC Electrical ................................................... 29

AC Electrical ............................................. 30-32

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Introduction

Servicing of marine engines and generator sets presents unique problems. In many cases boats cannot be moved to a repair facility. Marine engines

Failures begin with minor problems that are overlooked and become amplified when not corrected

during routine maintenance. cannot be compared to the servicing of automobiles, trucks or even farm equipment. Failures often occur in remote areas far from competent assistance. Marine engines are taxed far more severely than auto or truck engines; therefore, maintenance schedules must be adhered to more strictly.

As operator, it is your obligation to learn about your

equipment and its proper maintenance. This is not a

comprehensive technical service manual. Nor will it

make the reader into an expert mechanic. Its aim is

to aid you in maintaining your unit properly.

Unit Identification

MODELS INCLUDED

This manual covers the operating instructions for:

M673M, M673L, and M673D marine generator sets.

Model Numbers

Model numbers give the unit's application, block model, aspiration, and RPM:

673

M - Northern Lights marine generator set

Northern Lights marine diesel generator set with a 673 engine, TF-276M generator end,

M673M

M673L

M673D

and an automatic voltage regulator.

Northern Lights marine diesel generator set with a 673 engine, TF-276D generator end,

and an automatic voltage regulator.

Northern Lights marine diesel generator set with a 673 engine, TF-276D generator end,

and an automatic voltage regulator.

Serial Numbers

Figure 1: Generator set serial number plate.

Model number of engine block

Your set has three serial numbers: ➀ an engine number stamped on the block, ➁ a generator plate, and ➂ a generator set plate.

Use the serial number on the generator set plate when ordering parts or in correspondence. The generator set plate is found on the service side of the generator and resembles the drawing in Figure 1.

Bore Cylinders

67 mm 3

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Page 5

Warranty

A warranty registration certificate is supplied with your set. It entitles the original purchaser of our equipment to a warranty covering material or assembly faults. The extent of coverage is

NOTE: If the warranty is to apply, the servicing instructions outlined in this manual must be followed. If further information is needed, please

contact an authorized dealer or the factory. described in the Limited Warranty Statement. We recommend that you study the statement carefully.

Safety Rules

CAUTION:

You can avoid accidents by observing these safety rules. Study these rules carefully and enforce them on the job.

• Never leave engine without proper security.

• Turn the coolant tank cap slowly to relieve

pressure before removing. Add coolant only when the engine is stopped and cool.

• Mount a fire extinguisher near engine.

• Always disconnect the battery ground strap

before making adjustments.

• Operate engines in properly ventilated areas.

• Keep trash and other objects away from engine.

• Escaping fluids under pressure can penetrate

your skin. Use a piece of cardboard or wood, not your hands, to search for leaks.

• Avoid wearing loose clothing without a belt

when working around engines.

Accident reports show that careless use of engines causes a high percentage of accidents.

• Use caution in handling fuel. Never refuel a hot or running engine. Do not smoke while filling fuel tank or servicing fuel system.

• Keep your hands, feet, hair and clothing away from power-driven parts.

• Check for any loose electrical connections or faulty wiring.

• Engines should be operated only by knowledgeable, qualified personnel.

• Look completely around engine to make sure that everything is clear before starting.

• Do not operate an engine that isn't in proper working order. If an unsafe operating condition is noted, tag the set and control panel so others will also know about the problem.

• Do not oil or grease engine while it is running.

CAUTION: This symbol is used throughout this book to alert you to possible danger areas. Please take special notice of these sections.

• Provide first aid kits.

OM673 08/03

Page 6

Marine Generator Component Locations

Figure 2: M673 Non-Service Side.

Figure 3: M673 Service Side.

1. Heat Exchanger End Cap

2. Coolant Fill

3. Heat Exchanger/Expansion Tank/Exhaust Manifold

4. Lube Oil Fill- Top

5. Wet Exhaust Elbow

6. Generator End Cover

7. Base and Drip Pan

8. Starter Motor

9. DC Regulator

10. Belt Guard

11. DC Alternator

12. DC Circuit Breaker

13. Generator Control Box

14. AC Circuit Breaker

15. Air Filter Housing

16. Fuel Injector

17. Fuel Injection Pump

18. Fuel Lift Pump

19. Lube Oil Drain

20. Sea Water Pump

21. Lube Oil Fill- Side

22. Lube Oil Dipstick

23. Block Drain

24. Lube Oil Filter

25. Secondary Fuel Filter

26. Control Panel Plug-In

27. Fuel Inlet and Return

28. AVR Circuit Breaker

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Control Panels

1. SHUTDOWN BYPASS-PREHEAT SWITCH

There are three functions built into this switch: preheating the engine, flashing the generator field, and bypassing the engine safety shutdown circuit enabling a start. Hold the switch in the ON position for approximately 10 to 20 seconds before starting a cold engine. Holding the switch ON for too long can burn out the glow plugs.

NOTE: Three position Engine Control switches must be in the RUN position during preheating. Preheat switch must be held in ON position during starting.

Figure 6-A: Series 1-B Generator Control Panel

Figure 6-B: Series 3 Generator Control Panel

2. ENGINE CONTROL SWITCH

To start the engine, hold this switch in the START position until the engine is running.

NOTE: Excessive cranking of marine sets equipped with water lift muffler systems can cause engine damage. See page 7.

After the engine starts, release the switch and it will return to RUN position. To stop the engine, hold the switch in the STOP position.

NOTE: The rocker switch is used on Series 1 panels only, and has a light that glows when the set is running.

3. HOUR METER

Keeps track of engine running time.

4. OIL PRESSURE GAUGE

Shows the oil pressure in the engine lubricating system.

5. WATER TEMPERATURE GAUGE

Registers the temperature of the cooling water.

6. D.C. VOLTMETER OR AMMETER

When the engine is stopped, the voltmeter indicates the condition of the battery. When the engine is running, the voltmeter indicates the voltage output of the alternator.

Figure 6-C: Series 4 Generator Control Panel

For Series 4 Control Panels Only:

7. A.C. VOLTMETER

Shows the generator output voltage.

8. FREQUENCY METER (Hertz)

The frequency meter indicates engine speed: 1200 or 1800 RPM (60 Hz), or 1500 RPM (50 Hz).

9. AMMETER SELECTOR SWITCH

Used to check each phase for load condition.

NOTE: Always leave this switch in the ON position while the unit is running.

10. A.C. AMMETER

Shows the generator load on each phase. The phase is selected with the Ammeter Selector switch (Item 9).

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Page 8

Control Panels

Figure 7-A: Series 7.1 through Series 7.6 Generator

Control Panels.

1. SHUTDOWN BYPASS SWITCH

Manual Start Panels (S-7.0 and S-7.3)

Hold the switch in the on position for approximately 10 to 20 seconds before starting a cold engine. Holding the switch on for too long can burn out the glow plugs. To start the engine the bypass switch must be held on while moving the engine control switch into the start position. As soon as the engine starts release both switches.

Auto Start Panels (S-7.2, S-7.4, S-7.5, and S-7.6)

When the switch is in the auto start position, the unit will start upon closure of auxillary contacts. Moving the switch to the manual position will start the engine and it will run after the control timers have completed their sequence.

2. OIL PRESSURE GAUGE

Shows the oil pressure in the engine lubricating system.

3. HOUR METER

Keeps track of engine running time.

4. ENGINE TEMPERATURE GAUGE

Registers the temperature of the coolant.

5. D.C. VOLTMETER

When the engine is running, the voltmeter indicates the voltage output of the alternator.

6. STATUS INDICATOR PANEL

Engine monitoring alarms and lamps for monitoring engine functions.

7. ALARM LAMP TEST AND RESET BUTTON

Press UP to test the indicator lights and press DOWN to reset the alarm.

8. A.C. VOLTAGE ADJUSTMENT RHEOSTAT

Voltage has been set at the factory and should only be adjusted by factory-trained personnel.

9. AMMETER SELECTOR SWITCH

Used to check each phase for load condition.

NOTE: Always leave this switch in the ON position while the unit is running.

10. FREQUENCY METER (HERTZ)

The frequency meter indicates alternator current frequency: 60 Hz (1200 or 1800 RPM), or 50 Hz (1500 RPM).

Figure 7-B: Status Indicators for Series 7.3 through

Series 7.6 Generator Control Panels.

11. A.C. VOLTMETER

12. A.C. AMMETER

OM673 08/03

Shows the generator output voltage.

Shows the generator load on each phase. The phase is selected with the Ammeter Selector switch (

Item 9).

Page 9

Operating Procedures

BREAK-IN PERIOD

1. The first 100 hours on a new or reconditioned engine are critical to its life and performance.

2. Constantly check the engine temperature and oil pressure gauges (sets with Series 3 or 4 panels).

3. Oil consumption is greater during break-in as piston rings take time to seat.

4. Break-In Oil Changes: Change engine oil and filter at 50 hours. Change oil and filter again at 100 hours (consult Lubricants section for oil recommendation).

Operating Instructions:

Maintain at least a 75% load on your generator set for the first 100 hours. Vary the load will help seat the rings.

BEFORE STARTING

1. Check the water level by removing the pressure cap from the expansion tank or radiator. In order to give the cooling water an opportunity to expand, the level should be about 1 in. (2.5 cm) below the filler cap sealing surface when the engine is cold.

CAUTION: Use protective clothing and open the filler

cap carefully when the engine is warm to prevent burns.

2. Check the oil level in the crankcase with the dipstick. The oil level must be in the waffled area on the stick. Never allow the level to go below this area. Always add the same viscosity of oil as is already in the crankcase.

3. Check the fuel tank level and open any fuel valves.

4. Marine Sets: close the sea-cock, check and clean the sea strainer and reopen the sea-cock.

5. Marine Sets: place the battery switch in the ON position.

NOTE: The battery switch must always be kept ON while the engine is running. If the switch is turned OFF while the engine is running, the battery charging regulator could be ruined.

STARTING FOR S-1, S-1B, S-3, AND S-4, SEE

PAGE 6 FOR S-7

1. Hold the Shutdown Bypass-Preheat switch in the ON position for 10 to 20 seconds before starting a cold engine. Holding the switch too long can burn out the glow plugs.

2. While holding the Shutdown Bypass-Preheat switch in the ON position, push the Engine Control switch to the START position.

3. As soon as the engine starts, release both switches. Do not crank the starter for more than 20 seconds consecutively. If the engine fails to start with the first attempt, be sure that it has stopped completely before re-engaging.

NOTE: Excessive cranking of the starter on Marine sets equipped with a water lift muffler can cause engine damage. If the engine does not start after three 20second cranks, remove the impeller from the raw water pump. This will prevent the muffler from filling with water and backfilling the exhaust line and engine. Once the engine starts, shut it off immediately and re-install the impeller. Re-start the engine and check the exhaust overboard outlet for gushes of water.

OPERATING

1. Units with Series 3, Series 4, and Series 7 Control Panels: check gauges often. Oil pressure must be above 15 PSI. The D.C. voltmeter should read between 11 and 15 volts at 80°F (25°C) ambient temperature. The water temperature gauge on Marine sets must be below 200°F (94°C); on Industrial units, the water temperature gauge must be below 225°F (107°C). Check the A.C. voltage and frequency meters (Series 4 and 6 panels). If the gauges deviate from normal levels, shut down the generator set and investigate.

Let the unit run unloaded for a 3 - 5 minute warm-up period.

3. Add electrical load.

STOPPING

1. Remove electrical load from the generator set.

2. Run the engine for a 3 to 5 minute cool down period.

2. Move the Engine Control switch to the STOP position momentarily.

3. Marine Sets: shut off the seacock, fuel valve, and battery switch.

OM673 08/03

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Operating Procedures

SHUTDOWNS AND ALARMS

1. Your unit may be fitted with a warning horn to protect it from high water temperature or low oil pressure. a. Generator sets have shutdown systems to stop the

engine. They have no warning horns.

b. Other alarms and shutdowns are available as

optional equipment.

NOTE: Do not rely on your warning to the exclusion of careful gauge monitoring. Watching your gauges can prevent damage to the unit and dangerous power losses.

2. Do the following when your warning or shutdown system is activated: a. Check the temperature gauge.

If above 205°F (96°C), shut off the engine immediately.

b. Use the Trouble Shooting Guide on page 25 to

isolate the cause of the overheat.

CAUTION: Do not remove the water fill cap of an overheated engine. Escaping high temperature steam can cause severe burns. Allow the engine to cool and then remove the cap slowly using protective clothing.

SPARE PARTS

1. ADE recommends that you keep the following spare parts on hand for field service. The parts are available from your local Northern Lights dealer. Some marine models already have “On-Board-Kits,” a handy box that contains the most common parts you will need.

2. All owners should have the following: a. Primary and secondary fuel filter elements b. Oil filters c. Air filter (industrial units only) d. Alternator belt e. Thermostat and gaskets f. Raw water pump impeller & gaskets (marine only) f. Glow plug g. Injector and washer

3. If your set is operating a long distance from a servicing dealer, add the following: a. Complete set of injectors b. Copper washers for injector change c. Complete set of glow plugs d. Fuel lift pump

c. Make repairs. Restart your Marine set after the

temperature gauge registers below 200°F (94°C).

d. Watch the temperature gauge regularly and

turn off the unit if the temperature rises above 205°F (96°C) on Marine units.

3. If shutdown is activated and the temperature gauge shows temperature within normal temperature range: a. Check the engine crankcase oil level. b. If the oil level is low, fill with recommended

lubricating oil and restart. Watch the oil pressure gauge carefully and shut off the engine if it does not show a normal reading (20-60 PSI) after a few seconds of operation.

c. If the oil level is normal, DO NOT restart the

engine. Call your dealer for assistance.

OM673 08/03

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Servicing Schedule Chart

The Servicing Schedule Chart below shows the service schedule required for proper maintenance of your generator set. More detailed coverage of each Service Point (SP) is listed on the page noted in the ‘page’ column.

DAILY:

SP1 Check oil level in engine SP7 Check primary fuel filter SP13 Check cooling water level

Check sea strainer (marine only)

AFTER FIRST 50 HOURS:

SP2/3 Change engine oil and filter SP5 Check V-belt tension SP6 Adjust valves SP18 Check electrolyte in batteries

EVERY 50 HOURS:

SP5 Check V-belt tension SP18 Check electrolyte in batteries

EVERY 100 HOURS:

SP4 Check air cleaner

SERVICE 50 100 200 600 2400

POINT PAGE OPERATION DAILY Hours Hours Hours Hours Hours

EVERY 200 HOURS:

SP2/3 Change engine oil and filter SP8 Change primary fuel filter element SP9 Change secondary fuel filter SP10 Bleed the fuel system SP21 Inspect condition of exhaust elbow

EVERY 600 HOURS:

SP6 Check valve clearances SP11 Check injectors SP14 Check and flush cooling system SP16 Change impeller (marine only) SP18 Check state of charge of batteries

EVERY 2400 HOURS:

SP12 Check fuel injection pump SP15 Check and clean heat exchanger

ENGINE:

SP1 11 Check oil level ●

SP2 11 Change engine oil 1) 5) 7) 8)

SP3 11 Change lube oil filters 1) 5) ● 8)

SP4 12 Check air cleaner 1) 4) ●

SP5 12 Check V-belt tension 1) 4) ●

SP6 12 Check valve clearances 1) 2) 5) ●

FUEL SYSTEM:

SP7 13 Check primary filter (Racor) 2) 3) ●

SP8 13 Change primary filter element (Racor) 2) 3) ●

SP9 13 Change secondary fuel filter 1) 3) ●

SP10 14 Bleed the fuel system 3)

SP11 15-16 Check injectors 1) 3) ●

SP12 16 Check fuel injection pump ●

COOLING SYSTEM:

SP13 16 Check cooling water level ●

SP14 17 Check and flush cooling system ●

SP15 17 Check and clean heat exchanger ●

SP16 17 Change impeller in raw water pump 1) 3) ●

SP21 Inspect condition of exhaust elbow 4) ●

ELECTRICAL SYSTEM:

SP17 18 Check electrolyte level in batteries 1) 4) ●

SP18 18 Check condition of batteries with hydrometer 1) 4) ●

OUT OF SERVICE:

SP20 18 Winterizing or out-of-service 3)

1) Perform all maintenance once a year even if hour level has not been reached.

2) Consult manufacturer's maintenance schedule, note on chart.

3) Whenever necessary.

4) More often if necessary.

OM673 08/03

5) After first 50 hours.

6) Adjust at first 100 hours.

7) Change oil and filter on industrial units every 100 hours.

8) Change oil and filter on marine units every 200 hours.

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Service Record

Service

Point

SP5 Check V-belt tension

SP18 Check electrolyte

in batteries

SP2 Change engine oil (industrial sets)

SP3 Change lubricating oil filters (industrial sets)

SP4 Check air cleaner

OPERATION

HOURS/DATE

50 HOURS

100 HOURS

SP2 Change engine oil (marine sets)

SP3 Change lubricating oil filters (marine sets)

SP8 Change primary filter element (Racor)

SP9 Change secondary fuel filter

SP6 Check valve clearances

SP11 Check injectors

SP14 Check and flush cooling system

SP17 Change impeller in raw water pump

SP19 Check condition of batteries with hydrometer

200 HOURS

EVERY 600 HOURS

2400 HOURS

SP12 Check fuel injection pump

SP15 Check and clean heat exchanger

OM673 08/03

Page 13

Servicing

LUBRICATION - GENERAL

1. Use only clean, high quality lubricants stored in clean containers in a protected area.

2. These lubricants are acceptable: a. API Service CC/CD/CE single viscosity oils. b. API Service CC/CD/SF multi-viscosity oils.

3. Use the proper weight oil for your average operation temperature.

Air Single Multi-

Temperature Viscosity Viscosity

Above 32°F

(0°C)

-10 to 32°F

(-23 to 0°C)

Below -10°F

(-23°C)

Figure 8: Lube Oils

SAE 30W SAE 15-40W

SAE 10W SAE 10-30W

SAE 5W SAE 5-20W

4. Some increase in oil consumption may be expected when SAE 5W and SAE 5-20W oils are used. Check oil level frequently.

5. Never put additives or flushing oil in crankcase.

SP1. CHECKING OIL LEVEL

1. Check the oil level in the crankcase with the dipstick. The oil level must be in the waffled area on the stick. Never allow the level to go below this area. Follow the lubrication recommendations above.

SP2. OIL CHANGES

1. The set is delivered with special break-in oil. Change the engine oil and oil filter after 50 hours of operation. Use Service CC 30 weight oil during the first 100 hours.

2. Change the oil and filter again at 100 hours using the oil recommended in the previous diagram. After this, change oil and filter on industrial units every 100 hours; change oil and filter on marine units every 200 hours.

3. During intermittent cold weather operation, change oil every 100 hours or six weeks, whichever comes first.

4. Change oil at any seasonal change in temperature when a new viscosity of oil is required.

5. Change oil when engine is warm.

6. Dispose of waste oil in an approved manner.

7. Never use a flushing oil.

8. Loosen the clamp on the oil change tube. Remove cap. Drain oil. Replace the cap and tube.

9. Refill engine with recommended oil.

10. Engine capacity with new oil filter is:

673M, D, & L – 3.2 quarts (3.0 liters)

SP3. CHANGING LUBE OIL FILTER

1. Change the lube oil filter every with every oil change.

2. Use a filter wrench to remove old filter. Dispose of filter in approved manner.

3. Make sure the gasket from the old filter is removed and discarded. Clean mount face.

4. Spread a thin film of engine oil on the rubber gasket on the new filter and screw it on nipple until gasket meets the sealing surface.

5. Using hands only – no wrench – tighten filter one-half turn farther. Overtightening can do damage to filter housing.

6. Fill engine with recommended oil. Start engine and check for leakage. Stop engine, wait 3 minutes, and check oil level. Add additional oil if necessary.

7. Oil filter part numbers are:

OM673 08/03

673M – #24-02001 673L – #24-08001

Page 14

Servicing

SP4. AIR CLEANER

1. Inspect air cleaner every 100 hours. In dusty conditions, check more often.

2. M673: Inspect the element. If it is dirty, wash the element in soapy water. Rinse and dry thoroughly before reinstalling.

Valve Adjustment Screw

Rocker Arm

0.008 in.

0.200 mm.

NOTE: Make absolutely sure no impurities enter the engine while changing the element. Do NOT run the engine with the air cleaner removed.

SP5. V-BELTS

1. Check the tension and wear on the V-belt after every 50 hours.

2. Use your thumb to press on the belt at the midpoint between the crankshaft and alternator pulleys. The tension is correct if the belt can be depressed about 3/16 in. (5 mm).

TORQUING CYLINDER HEAD BOLTS

1. Tighten bolts when the engine is cold.

2. Loosen the nuts and remove rocker arm cover.

3. Remove fuel injectors and related tubes.

4. Tighten head bolts with a torque wrench in the order shown in the figure below. Tighten bolts evenly in 2 or 3 passes, ending at the specified torque in final pass. a. Torque: 26 - 29 ft/lbs (3.5 - 4.0 kg/m)

5. Re-install rocker arm shaft and adjust valves. Torque nuts to: 7 - 9 ft/lbs (1.0 - 1.3 kg/m)

6. Re-install injectors and tubes and rocker cover. Torque injectors to: 43 - 51 ft/lbs (6 - 7 kg/m) Use new injector sealing washers.

Figure 10: Valve Adjustment

SP6. VALVE CLEARANCES

1. Re-adjust valve clearance after first 50 hours of operation and every 600 hours thereafter.

2. Valve adjustments should be done after the cylinder head bolts have been re-tightened. Engine should be cold and NOT running.

3. Watch the valves while turning the engine over by hand. Turn until the #1 cylinder inlet valve starts to open and the exhaust valve starts to close (the valves are rocking). Then turn the crankshaft one more full turn and adjust the clearance on both valves for this cylinder.

4. Loosen the lock nut and adjust the clearance between the rocker arm and valve stem of both the intake and exhaust valves with the adjustment screw (

Figure 10). Clearance on both intake and exhaust

valves should be 0.008 in. (0.2 mm).

5. Repeat steps 3 and 4 for each cylinder. Each set of valves must be adjusted individually.

6. Replace the rocker arm cover. Tighten cover nuts to

7.2 - 8.7 ft/lbs (1.0 - 1.2 kg/m).

11 9 13

Figure 9: 673M Head Torque Sequence

121014

OM673 08/03

Page 15

Servicing

FUELS - GENERAL

1. Use only clean, high quality fuels of the following specifications, as defined by ASTM designation D975 for diesel fuels: a. Use Grade No. 2 diesel at ambient temperatures

above freezing 32°F (0°C).

b. Use Grade No. 1 at ambient temperatures below

freezing and for all temperatures at an altitude of above 5,500 ft. (1500 meters).

2. Use fuel having less than 1% sulphur (preferably less than 0.5%).

3. The cetane number should be a minimum of 45.

4. DO NOT use these unsuitable grades of fuel: a. Domestic heating oils, all types. b. Class B engine. c. Class D domestic fuels. d. Class E, F, G or H industrial or marine fuels. e. ASTM-D975-60T No. 4-D and higher number

fuels.

5. Storing fuel: a. Keep dirt, scale, water, and other foreign matter

out of fuel. b. Avoid storing fuel for long periods of time. c. Fill the fuel tank at the end of each day’s

operation. This will reduce condensation.

SP7-9. FUEL FILTERS

1. Your generator set should have a primary fuel filter installed. We recommend the Racor brand of fuel filter-water separators. a. Check the primary fuel filter daily as

recommended by the filter manufacturer. Empty the collection bowl as necessary.

b. Change the element as often as necessary or

every 200 hours.

c. If the bowl fills with water, change the primary

and secondary element immediately.

2. Change secondary fuel filter every 200 hours. a. Remove the spin-on filter by turning it

counterclockwise with a filter wrench. Fill the new cartridge with fuel and install it after applying engine oil to gasket surface. Screw on until the gasket surface comes into contact with sealing surface of filter base. Then, tighten it two-thirds of a turn by hand. Do not overtighten.

b. Fuel filter part numbers are:

#24-52020

OM673 08/03

Found on all M673M, D, & L units

Page 16

Servicing

SP10. BLEEDING THE FUEL SYSTEM

CAUTION: Escaping diesel fuel under pressure can penetrate skin causing serious personal injury. Before disconnecting lines be sure to relieve all pressure. Before applying pressure, be sure all connections are tight and lines, pipes and hoses aren't damaged. Fuel escaping from a very small hole can be almost invisible. Use a piece of cardboard or wood, rather than hands, to search for suspected leaks. If injured by escaping fuel, see a doctor at once. Serious infection or reaction can develop if proper medical treatment isn't administered immediately.

1. The fuel system is self-bleeding. However, any system may need manual bleeding when: a. A new fuel filter is installed; b. The engine has run out of fuel; c. The fuel lines, injection pump or any other fuel

system component has been removed and installed.

2. Loosen bleed screw “A” (Figure 11) on top of the filter. Pump hand primer “B” on fuel lift pump until pure fuel (no bubbles) escapes from bleed screw “A”. Tighten bleed screw “A”.

3. Loosen bleed screw “C”. Pump hand primer “B” on fuel lift pump until pure fuel (no bubbles) escapes from bleed screw “A”.

4. If the engine does not start after the above bleeding process, loosen a fuel line at the injector. Crank the engine until fuel escapes, then tighten the connection. Do each line one at a time.

5. After the engine has started, check for fuel leaks.

Figure 11-A: M673 Fuel System.

OM673 08/03

Page 17

Servicing

SP11. INJECTOR SERVICE

1. Injectors should be checked every 600 hours. Check should be made by a Northern Lights dealer or local injection repair station.

CAUTION: Escaping diesel fuel under pressure can have sufficient force to penetrate the skin causing serious personal injury. If injured by escaping diesel fuel, see a doctor at once.

2. Injector removal: a. Clean loose dirt from around the injectors and

the fuel lines.

b. Relieve high pressure in the fuel lines by

loosening the delivery line flare nuts at each injector (Figure 12).

c. Remove delivery lines by disconnecting from

injectors and injection pump (Figure 13). Remove all lines as an assembly; do not remove the clamp. Cover the ends of the lines, the injector inlets and injection pump outlets to keep dirt out (Figure 14).

d. Remove the return line retaining bolts (Figure 15).

Remove the return line (Figure 16).

e. Unscrew and remove the injectors (Figure 17).

NOTE: Do not use pry bars to remove injectors from cylinder head.

f. After removing the injectors, discard the copper

sealing washers from the injector hole in the head (Figure 18). Cover holes to prevent dirt and debris from entering the cylinders.

3. Injector installation: a. Install a new copper sealing washer in each

injector hole (Figure 18).

b. Screw in injector and tighten to 43 or 50 ft/lbs

(6 to 7 kgm) (Figure 19).

NOTE: Overtightening can damage injector.

c. Install return line using new copper sealing below

each connection. Tighten return line retaining bolts to 22 - 30 ft/lbs.

d. Install delivery lines. Leave loose at injectors for

bleeding.

e. Crank the engine to fill lines. Tighten lines at

injectors. Start engine and check for leaks using a piece of paper or cardboard.

DO NOT use hand to check for leaks.

SP12. INJECTION PUMP

1. Since operating conditions may vary considerably, it is difficult to give a definite interval for checking the injection pump. But as a rule, pump settings, maximum speed, idle speed and exhaust smoke should be checked after every 2400 hours of operation. Service of the fuel injection pump should only be done if checks indicate pump malfunction.

2. Black smoke can be an indication of pump malfunction. Before servicing the pump, check other possible causes: a. Check cleanliness of air filter. b. Check valve clearances. c. Clean and check injectors.

3. Any repair which involves disassembly of the injection pump must be carried out by specially trained mechanics with the proper tools and test equipment.

NOTE: All warranties on the engine become null and void if the injection pump seals are broken by unauthorized persons.

COOLING SYSTEM - GENERAL

NOTE: Marine sets – be sure to close the sea-cock before working on the engine cooling system.

CAUTION: The cooling water in the engine reaches extremely high temperatures. You must use extreme caution when working on hot engines to avoid burns. Allow the engine to cool before working on the cooling system. Open the filler cap carefully, using protective clothing when the engine is warm.

SP13. CHECK THE COOLANT LEVEL

1. Check the coolant level each day before starting the engine. Check the water level by removing the pressure cap from the expansion tank or radiator. In order to give the cooling water an opportunity to expand, the level should be about 1 in. (2.5 cm) below the filler cap sealing surface when the engine is cold.

2. The pressure valve in the filler cap releases when the pressure is approximately 7 PSI (0.5 bar). Use a cap pressure tester to check cap if you suspect it is faulty.

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Page 18

Servicing

Figure 12: Remove delivery line flare nuts.

Figure 13: Remove delivery lines.

Figure 16: Remove return line.

Figure 17: Unscrew injector.

Figure 14: Cover lines, inlets and injection pump outlets.

Figure 15: Remove return line nuts.

OM673 08/03

Figure 18: Remove and replace copper sealing washer.

Figure 19: Reinstall injector. Torque to proper tightness.

Page 19

Servicing

SP14. COOLING SYSTEM FLUSHING

1. Flush the cooling system every 600 hours or every 12 months, whichever comes first.

2. Marine sets: a. Remove expansion tank cap and drain engine

block. b. Leave all drains open. c. Pour clean water into expansion tank until water

coming from drains is free of discoloration and

sediment. d. Let water drain completely. e. Close drains and refill with recommended

mixture.

NOTE: Open sea cock before running engine.

3. Industrial sets: a. Remove radiator cap and open drain cocks on

radiator and engine block.

b. Pour clean water into radiator until water coming

from radiator is clear of discoloration.

c. Close the radiator drain and continue flushing until

water from engine drain is clear. d. Open all drain cocks and drain completely. e. Close drain cock and refill with recommended

coolant mixture. f. Clean fins on radiator.

4. Coolant Specifications (marine and industrial): Use 50% water / 50% ethylene glycol antifreeze mix. Antifreeze mixture is recommended as a good year-round coolant.

5. Check hoses and connections and repair any leakage.

SP15. HEAT EXCHANGER

1. Clean the heat exchanger core once a year or after 2400 hours of operation.

2. Drain expansion tank and heat exchanger.

3. Remove heat exchanger end covers and remove core.

4. Clean the inside of exchanger core tubes using a metal rod. Flush, inspect and clean again if necessary.

5. Reassemble. Fill the cooling system, start the engine and check for leaks.

SP16. RAW WATER PUMP

1. Change the seawater pump impeller every 600 hours, or as needed.

2. Remove the pump end cover. Pry out the impeller using needle-nose pliers or two screwdrivers. Be sure you remove all pieces of failed impeller.

NOTE: Place some kind of protection under the screwdrivers in order not to damage the pump housing.

3. Clean the inside of the housing.

4. Press in the new impeller and place the sealing washers in the outer end of the impeller center if this has not already been done.

5. Replace the cover using a new gasket or o-ring.

NOTE: Make sure that there is always an extra impeller and cover gasket in reserve on board.

GENERATOR ENDS

The maintenance and operation recommendations for the generator end are located on pages 19-22 under the heading “AC Generator”.

ELECTRICAL SYSTEM - GENERAL

1. Never switch battery switch off or break the circuit between the alternator and batteries while the engine is running. Regulator damage can result.

2. Do NOT reverse the polarity of battery cables when installing the battery.

3. When welding on the unit, disconnect the AC and DC voltage regulator and battery. Isolate the leads.

4. Disconnect the battery cables when servicing the D.C. alternator.

5. Never test with a screwdriver, etc., against any terminal to see if it emits sparks.

6. Do not polarize the alternator or regulator.

7. A D.C. circuit breaker protects your control panel and wiring harness. It is located in the side of the generator junction box.

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Servicing

GLOW PLUGS

1. Each cylinder is supplied with a glow plug which serves to heat the combustion chamber for starting.

2. To check the glow plugs, loosen the current carrying flat wire between the plus-poles of the glow plugs (Figure 20). Connect a D.C. test bulb between the plus-pole of the battery and the plus-pole of the glow plug. If the bulb lights up, the glow plug is functioning properly.

3. Check all glow plugs and replace any faulty ones.

Figure 20: Glow plugs.

BOOSTER BATTERIES

CAUTION: Battery gas can explode. Keep all flames and sparks away from batteries.

1. Before changing or using booster batteries, check battery electrolyte level. Add distilled water if necessary.

2. Booster and main batteries must have the same voltage rating.

3. First, connect positive (+) terminal of booster battery to positive (+) terminal of main battery. Then, connect negative (-) terminal of booster battery to ground on the engine block (see Figure 21).

4. Remove booster battery after starting engine.

5. Sealed batteries: See manufacturer charging and booster instructions.

SP 17-18. BATTERY CARE

1. Check electrolyte level every 50 hours or once per month. Add distilled water to manufacturer’s recommended level.

2. Batteries, cables and cable terminals should be checked and cleaned every 100 hours. Clean corrosion with a water and baking soda solution. Flush with clean water. Tighten terminals and grease them to inhibit corrosion.

3. Check the battery condition with a hydrometer every 600 hours.

SP19. WINTERIZING / OUT-OF-SERVICE

1. Drain fresh water and seawater cooling systems completely. Remember to shut off seacocks before opening drain cocks if the vessel is in the water.

2. Drain water supply lines and wet exhaust line.

3. Loosen the seawater pump cover and drain pump.

4. Change the crankcase oil and filter.

5. Loosen the alternator belt.

6. Disconnect and clean battery. Remove to warm storage place if possible.

7. Clean outside of unit. Paint any scratched or chipped surfaces. Put corrosion preventative on all exposed metal surfaces.

8. Fill the fuel tank or add biocide as per manufacturer’s instructions.

Figure 21:

Battery connections.

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Page 21

GENERAL

1. A Generator Set includes the engine, the generator, and the control or “J” box (Figure 22).

2. The generator and the control or “J” box produce the electrical power.

3. Generator excitation is provided by activation of the pre-heat circuit and electrical output voltage is controlled by the automatic voltage regulator (AVR) located in the control box (Figure 24, Item 2).

GENERATOR (Figure 23)

1. Stator Core

2. Stator Coil

3. End Cover

4. Brush

5. Ball Bearing

6. Slip Ring

7. Frame

8. Coupling Plate

9. Field Coil

10. Field Core

11. Shaft

12. Ventilation Cover

AC Generator - TF-276KM & TF-276D

Control

Box

Engine

Generator

Figure 22: Composition.

CONTROL BOX (Figure 24)

1. Control Terminal Board

2. Automatic Voltage Regulator (AVR)

3. 12 Volt DC Circuit Breaker

4. AC Circuit Breaker

5. AVR Circuit Breaker

6. Output Terminal Board

Figure 23: Generator Components.

Figure 24: Control Box Components.

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AC Generator - TF-276M & TF-276D

CONNECTIONS

1. 120 Volt Output: a. 120 volt output can be selected by connecting

the terminals of the control terminal board to 120 (Figure 25).

240

120

Figure 25: Control Terminal Board, 120 Volt Output

b. Connect U1 to U2 and V1 to V2 on the output

terminal board (Figure 26). Connect 120 volt output leads to terminals U1 and V2.

Figure 26: Output Terminal Board, 120 Volt Output

2. 240 Volt Output: a. 240 volt output can be selected by connecting

the terminals of the control terminal board to 240 (Figure 27).

Figure 28: Output Terminal Board, 240 Volt Output

3. 120/240 Volt Output a. Connect the control terminal board for 240 volts

(Figure 29).

240

120

Figure 29: Control Terminal Board, 120/240 Volt Output

b. Connect U2 and V1 on the output board

(Figure 30). Connect output leads to U1 and V2 and neutral lead to V1 (or U2). 240 volt output is available from the leads connected to U1 and V2. The 120 volt load should be divided as equally as possible between two 120 volt circuits.

240

120

Figure 27: Control Terminal Board, 240 Volt Output

b. Connect U2 to V1 on the output terminal board

(Figure 28).

Figure 30: Output Terminal Board, 120/240 Volt Output

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120

240

Page 23

AC Generator - TF-276M & TF-276D

OPERATION

In order to ensure a long, trouble-free life, the generator must be operated properly and the specified maintenance must be performed.

OPERATING ENVIRONMENT

Always keep electrical equipment clean. Moisture, salt, dust, and oil will damage the generator. The operating environment must be kept as clean and moisture free as possible.

VENTILATION

Good ventilation is important for proper generator operation. When installing the generator set, be sure the ambient temperature does not exceed 40°C (104°F) during operation.

MAINTENANCE

Proper and effective maintenance is required to ensure trouble-free operation. In addition to the above items, the following are required:

1. Periodically check all bolts and nuts for proper torque. This is especially true for coupling bolts.

2. Be sure to keep the generator area clean and dry. a. Dust and foreign material may reduce the flow of

cooling air, reducing heat dissipation and causing the generator to overheat.

b. If electrically conductive debris accumulates on

the windings, or if moisture or salt water are absorbed into the windings, the windings may short or ground, reducing voltage output.

c. Wiping is the only effective method for removing

dust and foreign materials. Use a clean, lint-free piece of cloth.

3. If the generator has not been operated for an extended period of time, check the insulation resistance of each stator coil and the rotor. Disconnect the AVR from the generator when performing this test.

4. Voltage Adjustment a. If there is some voltage, but it does not build up

to rated voltage, voltage adjustment can be made using the “hand trimmer” in the AVR (Figure 31).

b. The normal voltage setting at no load is 121 volts

at 62 Hertz or 242 volts at 62 Hertz.

HAND TRIMMER

Figure 31: Hand Trimmer Location on AVR.

5. Check the ball bearing in the generator end. a. Listen for unusual noise. b. Abnormal temperature rise can be noted by

discoloration. c. If the bearing is failing, it must be replaced. d. Generator bearing should be replaced by your

Northern Lights dealer at 10,000 hours.

6. Check the brushes a. The carbon brushes gradually wear with use, so

they must be inspected periodically and replaced as necessary.

b. If the brushes are excessively worn as to expose

the pigtail (Figure 32), sparking will occur at the surface of the slip ring, causing surface damage. Therefore, periodic inspection of the brushes is important.

c. Normally, the brushes will have to be replaced

with a new brush assembly within 3,000 hours.

PIGTAIL

Figure 32: Brush Pigtail.

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Page 24

AC Generator - TF-276M & TF-276D

7. Replacing Brushes a. Shut down the generator. Remove four screws

and end cover of the generator.

b. Brush assembly is white plastic with two wires

leading to it. It is located at ten o’clock and is held in position by two screws (Figure 33). Remove the screws and unplug leads.

Figure 33: Brush Location.

c. Attach leads to new brush assembly and install it

with the plastic ears towards the front of the generator.

NOTE: Be sure to connect wire J to terminal J, and connect wire K to terminal K.

8. Generator Protection

To protect the generator and AVR from unbalanced loads and over loads, two 20 amp breakers are placed in the output circuit and one 3 amp breaker is placed in the AVR sensing circuit (Figure 34).

DC CIRCUIT BREAKER

AVR CIRCUIT BREAKER

Figure 34: Breaker Locations.

9. Parts: See Parts Book for complete list a. Bearing

Part #22-68305

b. Brush assembly

Part #22-68304

10. Test Specifications: See Wiring Diagram(s) a. Resistance of J-K

16.6 ohm at 20°C (68°F)

b. Resistance of A-B

0.25 ohm at 20°C (68°F)

c. Resistance of U1-V2

0.56 ohm at 20°C (68°F)

d. No load voltage setting

242V or 121V at 62 Hz with cold generator

AC Circuit Breaker

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Troubleshooting

DC ELECTRICAL SYSTEM

PROBLEM POSSIBLE CAUSE RECOMMENDATION(S)

Battery Will Not Charge Loose or corroded connections • Clean and tighten battery connections.

Sulfated or worn out batteries • Check specific gravity of each battery.

• Check electrolyte level of each battery.

Loose or defective alternator belt • Adjust belt tension.

• Replace belt.

Starter Inoperative Check DC circuit breaker • If the breaker is tripped, reset it.

Loose or corroded connections • Clean and tighten loose battery and

harness plug connection.

Low battery output • Check specific gravity of each battery.

• Check electrolyte level of each battery.

Defective electrical system • Repair or replace. ground wire:

Starter Cranks Slowly Low battery output • Battery is too small.

• Battery cables are too small.

Check specific gravity • Replace battery if necessary. of each battery

Check electrolyte level • If low, fill cells with distilled water. of each battery

Crankcase oil too heavy • Fill with oil of appropriate viscosity. Loose or corroded connections • Clean and tighten loose connections.

Entire Electrical System Check DC circuit breaker • If breaker is tripped, reset it. Does Not Function

Faulty connection • Clean and tighten battery and harness

plug connections.

Sulfated or worn out batteries • Check specific gravity and electrolyte

level of each battery.

Dead Battery • Charge battery.

If you cannot correct problems with these procedures, see your Northern Lights dealer.

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Troubleshooting

ENGINE

PROBLEM POSSIBLE CAUSE RECOMMENDATION(S)

Engine Hard to Start Improper starting procedure • See starting section of this manual. Take or Will Not Start special note of Bypass Switch operation.

No fuel • Check level of fuel in fuel tank. Low battery output • Check electrolyte level and condition. Excessive resistance • Clean and tighten all battery connections.

in starting circuit Crankcase oil too heavy • Use oil of proper viscosity. Improper type of fuel • Consult fuel supplier and use proper type

of fuel for operating condition. Water, dirt or air in fuel system • Drain, flush, fill and bleed system. Clogged primary • Clean or replace filter element.

fuel filter element Clogged secondary • Replace filter element.

fuel filter element Dirty or faulty injection nozzles • Have your dealer check injection nozzles.

Engine Runs Irregularly Below normal engine temperature • Remove and check thermostat. or Stalls Frequently

Clogged primary • Clean or replace filter element. fuel filter element

Clogged secondary • Replace secondary filter element. fuel filter element

Water or dirt in the fuel system • Drain, flush, fill and bleed system. Dirty or faulty injection nozzles • Have your dealer check injection nozzles. Air in fuel system • Inspect clamps and hoses on suction side

of fuel pump for air leak. Improper type of fuel • Consult fuel supplier and use proper type

of fuel for operating condition.

Lack of Engine Power Intake air restriction • Service air cleaner.

Clogged primary • Clean or replace filter element. fuel filter element

Clogged secondary • Replace filter element. fuel filter element

Improper type of fuel • Consult fuel supplier and use proper type of

fuel for operating conditions. Overheated engine • See “Engine Overheats” in next category. Below normal engine temperature • Remove and check thermostat. Improper valve clearance • Reset valves. Best done by dealer. Dirty or faulty injection nozzles • Replace injectors. Best done by dealer.

• See your local dealer.

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Troubleshooting

ENGINE

PROBLEM POSSIBLE CAUSE RECOMMENDATION(S)

Engine Overheats Low coolant level • Fill tank or radiator to proper level.

• Check hoses for loose connections and leaks.

Keel cooling tubes have been • Remove paint from tubes. painted (marine)

Cooling system needs flushing • Flush cooling system. Defective thermostat • Remove and check thermostat. Defective temperature gauge • Check water temperature with thermometer

and replace gauge if necessary.

Water pump impeller worn/broken • Check impeller and replace if necessary.

Engine Knocks Insufficient oil • Call your dealer.

Injection pump out of time • Call your dealer. Below normal engine temperature • Check your thermostats.

• Check water temperature to see if temperature gauge is working properly.

Engine overheating • See “Engine Overheating” section.

High Fuel Consumption Improper type of fuel • Use correct fuel for temperature.

Clogged or dirty air cleaner • Service air cleaner. Improper valve clearance • See your dealer. Injection nozzles dirty • See your dealer. Injection pump out of time • See your dealer. Engine not at proper temperature • Check your thermostats.

• Check water temperature with thermometer and replace gauge if necessary.

Below Normal Thermostats not working properly • Check thermostats. Engine Temperature

Temperature gauge • Check water temperature with thermometer. not working properly

Low Oil Pressure Low oil level • Fill crankcase to proper level.

Improper type of oil • Drain and fill crankcase with correct oil. Partially plugged oil filter • Replace filter.

If you cannot correct problems with these procedures, see your Northern Lights dealer.

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Page 28

Troubleshooting

ENGINE

PROBLEM POSSIBLE CAUSE RECOMMENDATION(S)

High Oil Consumption Break-in period • Oil consumption decreases after break in.

Crankcase oil too light • Use proper viscosity oil. Oil leaks • Check for leaks in lines around gaskets

and drain plug.

Engine Emits Black Clogged or dirty air cleaner • Service air cleaner. or Gray Exhaust Smoke

Engine Emits Improper fuel • Use correct fuel for temperature. White Smoke

Defective muffler • Have dealer check back pressure. (back pressure too high)

Improper fuel • Use correct fuel for temperature. Injection nozzles dirty • See your dealer. Engine out of time • See your dealer.

Cold engine • Warm up engine to normal operating

temperature. Defective thermostat • Remove and check thermostat. Engine out of time • See your dealer.

If you cannot correct problems with these procedures, see your Northern Lights dealer.

OM673 08/03

Page 29

Northern Lights Marine Data

Model: M673D M673M M673L

RPM 1800 1500 1800 1500 1800 1500 kW Rating 5.0 4.5 6.0 4.8 6.0 5.0 Frequency (Hz) 60 50 60 50 60 50

GENERAL INFORMATION

Cylinders 33 3 3 33 Displacement 41.1 in

(0.676 ltr) (0.676 ltr) (0.676 ltr) (0.676 ltr) (0.761 ltr) (0.761 ltr)

Cycle 44 4 4 44 Bore 2.64 in 2.64 in 2.64 in 2.64 in 2.64 in 2.64 in

(67 mm) (67 mm) (67 mm) (67 mm) (67 mm) (67 mm)

Stroke 2.52 in 2.52 in 2.52 in 2.52 in 2.83 in 2.83 in

(64 mm) (64 mm) (64 mm) (64 mm) (72 mm) (72 mm)

Rotation (facing flywheel) CCW CCW CCW CCW CCW CCW Compression Ratio 24:1 24:1 24:1 24:1 24:1 24:1 Crankcase Capacity w/ Oil Filter 3.0 qts 3.0 qts 3.0 qts 3.0 qts 3.4 qts 3.4 qts

(2.8 ltr) (2.8 ltr) (2.8 ltr) (2.8 ltr) (3.2 ltr) (3.2 ltr)

Aspiration Natural Natural Natural Natural Natural Natural Dry Weight / Complete Unit 352 lbs 352 lbs 355 lbs 355 lbs 350 lbs 350 lbs

(160 kg) (160 kg) (161 kg) (161 kg) (159 kg) (159 kg)

Height 19.6 in 19.6 in 19.46 in 19.46 in 20.25 in 20.25 in

(498 mm) (498 mm) (496 mm) (496 mm) (513 mm) (513 mm)

Width 17.2 in 17.2 in 17.2 in 17.2 in 17.2 in 17.2 in

(437 mm) (437 mm) (437 mm) (437 mm) (437 mm) (437 mm)

Length 26.9 in 26.9 in 27.1 in 27.1 in 27.1 in 27.1 in

(683 mm) (683 mm) (688 mm) (688 mm) (688 mm) (688 mm)

41.1 in

46.4 in

COOLING SYSTEM

Approximate Cooling System Capacity .5 gal .5 gal .5 gal .5 gal .5 gal .5 gal

(2 ltr) (2 ltr) (2 ltr) (2 ltr) (2 ltr) (2 ltr)

Minimum Through-Hull Diameter 0.75 in 0.75 in 0.75 in 0.75 in 0.75 in 0.75 in

(19 mm) (19 mm) (19 mm) (19 mm) (19 mm) (19 mm)

Raw Water Pump Inlet Hose I.D. 0.75 in 0.75 in 0.75 in 0.75 in 0.75 in 0.75 in

(19 mm) (19 mm) (19 mm) (19 mm) (19 mm) (19 mm)

Minimum Seawater Discharge 0.75 in 0.75 in 0.75 in 0.75 in 0.75 in 0.75 in

(19 mm) (19 mm) (19 mm) (19 mm) (19 mm) (19 mm)

Heat Rejection to Jacket Water 350 BTU/min 250 BTU/min 600 BTU/min 600 BTU/min 420 BTU/min 350 BTU/min Fresh Water Pump Capacity 5.0 gal/min 4.2 gal/min 5.0 gal/min 4.1 gal/min 5.0 gal/min 4.2 gal/min

(18.92 ltr/min) (15.77 ltr/min) (18.92 ltr/min) (15.77 ltr/min) (18.92 ltr/min) (16 ltr/min)

Maximum Seawater Pump Suction Head 39 in 39 in 39 in 39 in 39 in 39 in

(1 m) (1 m) (1 m) (1 m) (1 m) (1 m)

Seawater Pump Capacity 8.0 gal/min 7.0 gal/min 9.0 gal/min 7.5 gal/min 8.0 gal/min 7.0 gal/min

(30 ltr/min) (26 ltr/min) (34 ltr/min) (28.4 ltr/min) (30 ltr/min) (26 ltr/min)

Keel Cooler Turbo Tube Length 4 ft 4 ft 4 ft 4 ft 4 ft 4 ft

(1.2 m) (1.2 m) (1.2 m) (1.2 m) (1.2 m) (1.2 m)

Keel Cooler Head Diameter 0.75 in NPT 0.75 in NPT 0.75 in NPT 0.75 in NPT 0.75 in NPT 0.75 in NPT

(19.1 mm) (19.1 mm) (19.1 mm) (19.1 mm) (19.1 mm) (19.1 mm)

Keel Cooler Water Hose I.D. Discharge and Suction 1.0 in 1.0 in 1.0 in 1.0 in 1.0 in 1.0 in

(25 mm) (25 mm) (25 mm) (25 mm) (25 mm) (25 mm)

OM673 08/03

Page 30

Northern Lights Marine Data

Model: M673D M673M M673L

RPM 1800 1500 1800 1500 1800 1500 kW Rating 5 4.5 6 4.8 6 5 Frequency (Hz) 60 50 60 50 60 50

ELECTRICAL

Minimum Battery Capacity (Amp/hr) 45 45 45 45 45 45 Battery Cable Size #1 up to 10 ft #1 up to 10 ft #1 up to 10 ft #1 up to 10 ft #1 up to 10 ft #1 up to 10 ft Instrument Harness Length (Standard) 20 ft 20 ft 20 ft 20 ft 20 ft 20 ft

Starting Voltage, Negative Ground 12 V 12 V 12 V 12 V 12 V 12 V

AIR

Generator Cooling Air Flow 200 f3/min 200 f3/min 200 f3/min 166 f3/min 200 f3/min 200 f3/min

Air Consumption 21.4 f3/min 17.8 f3/min 21.4 f3/min 17.8 f3/min 23.9 f3/min 19.9 f3/min

Minimum Engine Room Vent 5.7 in2/min 5.7 in2/min 5.7 in2/min 5.7 in2/min 5.7 in2/min 5.7 in2/min

Maximum Exhaust Back Pressure 48 in H2O 48 in H2O 48 in H2O 48 in H2O 48 in H2O 48 in H2O

Wet Exhaust Elbow OD 1.5 in OD 1.5 in OD 1.5 in OD 1.5 in OD 1.5 in OD 1.5 in OD

Dry Exhaust Elbow ID 1.25 in NPT 1.25 in NPT 1.25 in NPT 1.25 in NPT 1.25 in NPT 1.25 in NPT

(6.1 m) (6.1 m) (6.1 m) (6.1 m) (6.1 m) (6.1 m)

(5.7 m3/min) (5.7 m3/min) (5.7 m3/min) (4.7 m3/min) (5.7 m3/min) (5.7 m3/min)

(0.61 m3/min) (0.51 m3/min) (0.61 m3/min) (0.50 m3/min) (0.68 m3/min) (0.57 m3/min)

(37 cm2/min) (37 cm2/min) (37 cm2/min) (37 cm2/min) (37 cm2/min) (37 cm2/min)

(122 cm H2O) (122 cm H2O) (122 cm H2O) (122 cm H2O) (122 cm H2O) (122 cm H2O)

(38 mm) (38 mm) (38 mm) (38 mm) (38 mm) (38 mm)

(32 mm) (32 mm) (32 mm) (32 mm) (32 mm) (32 mm)

MAXIMUM INTERMITTENT ENGINE OPERATING ANGLE

Front or Rear Down 0- 35° 0- 35° 0- 35° 0- 35° 0- 35° 0- 35°

FUEL

Minimum Suction Line 5/16 in 5/16 in 5/16 in 5/16 in 5/16 in 5/16 in

Minimum Return Line 5/16 in 5/16 in 5/16 in 5/16 in 5/16 in 5/16 in

Maximum Fuel Pump Head Suction 39 in 39 in 39 in 39 in 39 in 39 in

PERFORMANCE DATA

Rated Flywheel HP 7.7 7.2 8.3 7.0 9.4 7.7

Specific Fuel Consumption at Maximum Load 0.497 lbs/hp/hr 0.493 lbs/hp/hr 0.444 lbs/hp/hr 0.444 lbs/hp/hr 0.444 lbs/hp/hr 0.453 lbs/hp/hr

Approximate Fuel Rate at Maximum Load 0.53 gal/hr 0.50 gal/hr 0.54 gal/hr 0.43 gal/hr 0.59 gal/hr 0.49 gal/hr

(8 mm) (8 mm) (8 mm) (8 mm) (8 mm) (8 mm)

(1.0 m) (1.0 m) (1.0 m) (1.0 m) (1.0 m) (1.0 m)

(302 g/kw/hr) (300 g/kw/hr) (270 g/kw/hr) (270 g/kw/hr) (270 g/kw/hr) (275 g/kw/hr)

(2.05 ltr/hr) (1.93 ltr/hr) (2.08 ltr/hr) (1.66 ltr/hr) (2.4 ltr/hr) (1.9 ltr/hr)

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Page 31

DC Wiring Diagrams

Drawing #B-6102F

DC Engine Wiring Diagram

Wiring diagrams are subject to change without notice.

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Page 32

AC Wiring Diagrams

AC Wiring Diagram

Drawing #B-6103C

Wiring diagrams are subject to change without notice.

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Page 33

AC Wiring Diagrams

AC Wiring Diagram

Drawing #B-6104B

Wiring diagrams are subject to change without notice.

OM673 08/03

Page 34

AC Wiring Diagrams

AC Wiring Diagram

Drawing #B-6105A

Wiring diagrams are subject to change without notice.

OM673 08/03

Northern Lights M673M, M673D, M673L Operator's Manual

Specifications and Main Features

Frequently Asked Questions

User Manual