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Northern Lights L944 Engine

The Northern Lights L944 is a 3.3 L 4-cylinder turbocharged engine rated at 1800 rpm, producing up to 44.7 kW. It powers generator sets from Northern Lights, including the M944, NL944D3 and NL944T3. It holds 10 L (2.6 gal) of oil.

Also known as: Lugger L944

Part of the Northern Lights 944 engine family — 8 variants share parts & fitment.

3.3 L

Displacement

Cylinders

1800 rpm

Rated speed

44 kW

Gross power

On this pageSpecs Generator sets Maintenance FAQ Service intervals Torque & specs Fluids Procedures

Engine specifications

Oil capacity	10.0 L
Displacement	3.3 L
Cylinders	4
Aspiration	Turbocharged
Rated speed	1800 rpm
Gross power	44 kW

Generator sets powered by this engine

Northern Lights M944 Northern Lights NL944D3 Northern Lights NL944T3

How to read your Northern Lights engine serial & model number →

Common problems

Engine Hard to Start or Will Not Start
Cause: Improper starting procedure
Fix: See starting section of this manual. Take special note of Bypass Switch operation.
Lack of Engine Power
Cause: Engine overloaded
Fix: Reduce the load.
Engine Emits Black or Gray Exhaust Smoke
Cause: Clogged or dirty air cleaner
Fix: Service air cleaner.
Engine Emits White Smoke
Cause: Improper fuel
Fix: Use correct fuel for temperature.
High Fuel Consumption
Cause: Improper type of fuel
Fix: Use correct fuel for temperature.
Engine Runs Irregularly or Stalls Frequently
Cause: Below normal engine temperature
Fix: Remove and check thermostat.
Engine Overheats
Cause: Engine overloaded
Fix: Reduce the electrical load.
Starter Cranks Slowly
Cause: Low battery condition
Fix: Battery is too small; Battery cables are too small.
Engine Knocks
Cause: Insufficient oil
Fix: Call your dealer.
Starter Inoperative
Cause: Check DC circuit breaker
Fix: If the breaker is tripped, reset it.
High Oil Consumption
Cause: Break-in period
Fix: Oil consumption decreases after break in.
Low Oil Pressure
Cause: Low oil level
Fix: Fill crankcase to proper level.
Entire Electrical System Does Not Function
Cause: Check DC circuit breaker
Fix: If breaker is tripped, reset it.
Battery Will Not Charge
Cause: Loose or corroded connections
Fix: Clean and tighten battery connections.
Below Normal Engine Temperature
Cause: Thermostats not working properly
Fix: Check thermostats.

Compiled from service & troubleshooting documentation across every generator set that uses the Northern Lights L944.

Maintenance schedule

Item	Spec	Capacity	Part #	Interval
Oil		10.0 ltr	—	250 hr

Pooled from every document that names this exact engine — confirm the interval and part number against your unit's serial number.

Service intervals

Item	Action	Hours	Months	Notes
Battery electrolyte level	Check	100 hr	1 mo	First service — Every 50 hours, or once a month (SP20)
Engine oil	Change	1000 hr	6 mo	First service — SP2; after first 50 hours.
Lube oil filter	Change	50 hr		First service — SP3; after first 50 hours.
Valve clearance	Adjust	50 hr		First service — Readjust after first 50 hours
Valve clearances	Adjust	50 hr		First service — Readjust after first 50 hours (SP6)
Valves	Adjust	50 hr		First service — After first 50 hours
Batteries, cables and terminals	Clean	100 hr		Check and clean every 100 hours; tighten terminals and grease
Batteries, cables, and terminals	Check	100 hr		Check and clean every 100 hours (SP21)
Batteries, cables, and terminals	Clean	100 hr		Check and clean every 100 hours
Batteries, cables, terminals	Clean	100 hr		Clean corrosion with water and baking soda solution; tighten and grease terminals
Battery cables and terminals	Clean	100 hr		Every 100 hours
Battery electrolyte	Check	100 hr	1 mo	First service — SP20; every 100 hours.
V-belt	Check	100 hr		First service — SP5; every 100 hours.
V-belt tension	Check	100 hr		First service — Every 100 hours (SP5)
Air cleaner	Check	250 hr		Visually inspect every 250 hours
Air cleaner	Inspect	250 hr		Every 250 hours
Secondary fuel filter	Change	500 hr		SP9; every 250 hours.
Turbocharger air, oil, and cooling lines	Check	250 hr		Leak check
Zinc electrodes	Check	250 hr		SP19; every 250 hours.
Batteries	Check	500 hr		Every 500 hours: Check state of charge of batteries (SP21)
Batteries	Test	500 hr		SP21; check state of charge/condition of batteries.
Batteries state of charge	Check	500 hr		Every 500 hours
Battery	Check	500 hr		Every 500 hours: check state of charge of batteries.
Battery	Test	500 hr		Check state of charge with hydrometer
Battery condition	Test	500 hr		Hydrometer every 500 hours
Battery condition (hydrometer)	Test	500 hr		EVERY 500 HOURS (SP20)
Cooling system	Check	500 hr		SP15 in chart at 500 hours; flush every 2000 hours or every 2 years
Cooling system	Other	2000 hr	12 mo	SP15 in chart; listed as SP14 in text. Check and flush cooling system.
Crankcase vent filter	Check	500 hr		Change element when service indicator pops up
Fuel injectors	Check	500 hr		SP11 in chart; listed as SP10 in text.
Fuel system	Other	500 hr		SP10 in chart; listed as SP9 in text. Bleed the fuel system.
Fuel system bleeding	Other	500 hr		Every 500 hours
Impeller in raw water pump	Replace	500 hr		EVERY 500 HOURS (SP17)
Injectors	Check	500 hr		Every 500 hours; emission intervals at 1500 and 3000 hours
Primary fuel filter element	Change	500 hr		Schedule chart summary lists 500 hours; SP-8 text says every 200 hours or as necessary
Raw water pump impeller	Change	500 hr		SP17 in chart; listed as SP16 in text.
Raw water pump impeller	Replace	500 hr		Or as needed
Valve clearance	Check	500 hr		SP6; every 500 hours.
Valve clearances	Check	500 hr		Every 500 hours (SP6); readjust after first 50 hours
battery state of charge	Check	500 hr		Hydrometer check every 500 hours

Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.

Service specifications

Type	Item	Value	Unit	Condition
Clearance	Coolant level	1	in.	below filler cap sealing surface when engine cold; also 2.5 cm
Clearance	Coolant level, cold	about 1	in. (2.5 cm) below filler cap sealing surface	cold engine
Clearance	Exhaust valve clearance, cold	0.0098	in. (0.25 mm)	cold engine
Clearance	Intake valve clearance, cold	0.0098	in. (0.25 mm)	cold engine
Clearance	V-belt deflection	10-12	mm	with 10 kg (22 lbs.) force at midpoint between crankshaft and alternator pulleys
Clearance	V-belt deflection at midpoint between crankshaft and alternator pulleys	.39 to .47 in. (10 - 12 mm)	in. (mm)	with 22 lbs. (10 kg) force
Gap	V-belt deflection	.39 to .47	in. (10 - 12 mm) at 22 lbs. (10 kg) force
Other	Antifreeze concentration	30 to 50	% antifreeze solution	maximum 50%
Other	Coolant capacity	11.4	liters	approximately; also 3 gal.
Other	Coolant level	about 1	in. (2.5 cm)	below filler cap sealing surface when engine is cold
Other	Coolant level (cold, at expansion tank filler)	1	in. (2.5 cm) below filler cap sealing surface	engine cold
Other	Coolant pH	6.5 to 8.5	pH	soft water combined with antifreeze
Other	Coolant water pH	6.5 to 8.5	pH	soft water mixed with antifreeze in 30% to 50% maximum solution
Other	Engine oil capacity with new filter	10	liters	also 2.64 gallons
Other	Engine oil level	between high and low marks		dipstick
Other	Exhaust back pressure at engine exhaust elbow (F Series installation)	15	in. (381 mm) of water	maximum allowed
Other	Exhaust back pressure, maximum	27 in. (685 mm) of water	in. of water	measured at the engine exhaust elbow
Other	Firing order	1-3-4-2		valve clearance measurement and adjustment
Other	Fuel cetane number	45	cetane number	or higher
Other	Fuel cetane number	45 or higher
Other	Fuel particulate contaminant	5.0	mg/l	or lower
Other	Fuel sulfur content	less than 0.2	% by weight	less than 0.05% recommended
Other	Fuel sulphur	less than 0.2% of weight (less than 0.05% recommended)
Other	Injector expected service life	5,000	hours
Other	Preheat time	10-20	seconds	before attempting startup
Other	Starter cranking time	not more than 10	seconds	consecutive cranking
Other	V-belt deflection	0.39 to 0.47	in.	with 22 lbs. (10 kg) force
Other	V-belt deflection	10 - 12	mm	with 22 lbs. (10 kg) force
Other	V-belt deflection	10 to 12	mm	with 22 lbs. (10 kg) force
Pressure	Engine oil pressure	15	PSI	minimum; oil pressure must be above
Pressure	Engine oil pressure	20-60	PSI	normal operating
Pressure	Engine oil pressure	above 15	PSI	engine running
Pressure	Engine oil pressure - minimum during operation	15	PSI	gauges checked often while operating
Pressure	Engine oil pressure - normal operating range	20-60	PSI	engine running
Pressure	Engine oil pressure minimum	15	PSI	running
Pressure	Engine oil pressure minimum	above 15	PSI	operating
Pressure	Engine oil pressure normal	20-60	PSI	Engine running
Pressure	Engine oil pressure normal reading	20-60	PSI	after a few seconds of operation
Pressure	Engine oil pressure while operating	above 15	PSI	check gauges often
Pressure	Engine oil pressure, minimum while operating	above 15	PSI
Pressure	Engine oil pressure, normal operating	20-60	PSI
Pressure	Exhaust back pressure	27	in. water	maximum; also 685 mm water at engine exhaust elbow
Pressure	Exhaust back pressure	not greater than 15	in. water (381 mm)	measured at engine exhaust elbow
Pressure	Fuel injection valve opening pressure	11.77	MPa
Pressure	Fuel injection valve opening pressure	120	kgf/cm2
Pressure	Fuel injection valve opening pressure	1710	PSI
Pressure	Fuel injector valve opening pressure	11.77	MPa
Pressure	Fuel injector valve opening pressure	1710	PSI
Pressure	Injector opening pressure	11.77	MPa	120 kgf/cm2, 1710 PSI
Pressure	Minimum engine oil pressure	15	PSI	Engine running
Pressure	Minimum oil pressure	above 15	PSI	operating
Speed	Frequency	60 Hz (1800 rpm) or 50 Hz (1500 rpm)	Hz
Speed	Frequency meter reference	60 Hz (1800 rpm) or 50 Hz (1500 rpm)	rpm
Temperature	Battery charging minimum temperature	16	°C (60°F)	battery must warm to before charging
Temperature	Battery charging minimum warm-up temperature	at least 16	°C	before charging a frozen battery; also 60°F
Temperature	Coolant shutdown check	above 205	°F (96° C)	shutdown/alarm
Temperature	Coolant temperature	200	°F	normal operating; must be below
Temperature	Coolant temperature	205	°F	shutdown if above
Temperature	Coolant temperature	94	°C	normal operating; must be below
Temperature	Coolant temperature	96	°C	shutdown if above

Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.

Recommended fluids

Fluid	Grade	Standard	Ambient	Capacity	Notes
Coolant	50% water / 50% (maximum) ethylene glycol antifreeze	pH 6.5 to 8.5; antifreeze should not contain amine, silicate, or borate		11.4 L	Recommended year-round coolant
Coolant	50% water / 50% (maximum) ethylene glycol antifreeze mix	Soft water pH 6.5 to 8.5; antifreeze without amine, silicate, or borate		11.4 L	Distilled, deionized, or soft water preferred; approximately 3 gal. (11.4 liters).
Coolant	50% water / 50% maximum ethylene glycol antifreeze	Soft water pH 6.5 to 8.5; antifreeze not containing amine, silicate, or borate		11.4 L	Antifreeze 30% to 50% maximum solution; capacity approximately 3 gal. (11.4 liters)
Coolant	Distilled, deionized, soft water	Maximum chlorides 40 ppm; sulfates 100 ppm; dissolved solids 340 ppm; total hardness 170 ppm; pH 5.5 to 9.0			Tap water should not be used unless tested; do not use reverse osmosis water unless pH neutralized.
Engine oil		API FA-4 or CK-4 (low ash for diesel particulate filters)			For units with DPF ('F' Series models). Use only low ash lubricating oil; no additives or flushing oil
Engine oil	Service CC30				Use during first 100 hours.
Engine oil	SAE 10-30W	API Service CD, CE, and CF-4	-23°C to 0°C	10.0 liters	-10° to 32°F (-23° to 0°C). Use diesel-rated break-in oil during first 100 hours.
Engine oil	SAE 10W	API Service CD, CE, CF-4 single viscosity	-23°C to 0°C		-10° to 32° F (-23° to 0° C).
Engine oil	SAE 10W / SAE 10-30W	API Service CD, CE, CF-4	-23°C to 0°C	10.0 L	-10° to 32°F (-23° to 0°C)
Engine oil	SAE 10W single viscosity / SAE 10-30W multi-viscosity	API Service CD, CE, CF-4	-23°C to 0°C		-10° to 32°F (-23° to 0°C)
Engine oil	SAE 10W single viscosity or SAE 10-30W multi-viscosity	API Service CD, CE, CF-4	-23°C to 0°C	10.0 L	-10° to 32°F (-23° to 0°C)
Engine oil	SAE 10W-30	API FA-4 or CK-4 for DPF 'F' models; CH-4 or higher for 'W' models	-23°C to 0°C	10.0 L	For average operation temperature -10° to 32°F (-23° to 0°C)
Engine oil	SAE 15-40W	API Service CD, CE, and CF-4	above 0°C	10.0 liters	Above 32°F (0°C). Use diesel-rated break-in oil during first 100 hours.
Engine oil	SAE 15W-40	API FA-4 or CK-4 for DPF 'F' models; CH-4 or higher for 'W' models	above 0°C	10.0 L	For average operation temperature above 32°F (0°C)
Engine oil	SAE 30W	API Service CD, CE, CF-4 single viscosity	above 0°C		Above 32° F (0° C).
Engine oil	SAE 30W / SAE 15-40W	API Service CD, CE, CF-4	above 0°C	10.0 L	Above 32°F (0°C)
Engine oil	SAE 30W single viscosity / SAE 15-40W multi-viscosity	API Service CD, CE, CF-4	above 0°C	10.0 liters	Above 32°F (0°C); capacity for Model 944W3 with new oil filter
Engine oil	SAE 30W single viscosity or SAE 15-40W multi-viscosity	API Service CD, CE, CF-4	above 0°C	10.0 L	Above 32°F (0°C)
Fuel		JIS K2204; ISO-8217-DMA; BS 2869 Part 1 Class A1; BS 2869 Part 2 Class A2			International fuel specifications listed.
Fuel	Grade No. 1 diesel	ASTM D975	below 0°C		Use at ambient temperatures below freezing.
Fuel	Grade No. 2 diesel above freezing 32° F (0° C); Grade No. 1 below freezing	ASTM designation D975			Sulphur less than 0.2% by weight (less than 0.05% recommended); cetane number 45 or higher; particulate contaminate 5.0 mg/l or lower
Fuel	No. 1 diesel	ASTM D975	below 0°C		Below freezing
Fuel	No. 1 diesel below freezing	ASTM D975	below 0°C		Use at ambient temperatures below freezing
Fuel	No. 2 diesel above 32°F (0°C); No. 1 diesel below freezing	ASTM D975; cetane number 45 or higher; sulfur less than 0.2%			Particulate contaminate 5.0 mg/l or lower
Fuel	No. 2 diesel above freezing 32° F (0° C); No. 1 below freezing	ASTM D975; JIS K2204; ISO-8217-DMA; BS 2869 Part 1 Class A1; BS 2869 Part 2 Class A2			Sulphur less than 0.2% of weight (less than 0.05% recommended); cetane number 45 or higher; particulate contaminate 5.0 mg/l or lower
Fuel	Grade No. 2 diesel	ASTM D975	above 0°C		Use at ambient temperatures above freezing 32°F (0°C). Sulfur less than 0.2% by weight; cetane 45 or higher; particulate 5.0 mg/l or lower.
Fuel	No. 2 diesel	ASTM D975	above 0°C		Above freezing 32°F (0°C); cetane 45 or higher; sulfur less than .2% weight
Fuel	No. 2 diesel above freezing 32°F (0°C)	ASTM D975; cetane 45 or higher; sulfur less than .2% weight (0.05% recommended); JIS K2204, ISO-8217-DMA, BS 2869 Part 1 Class A1, BS 2869 Part 2 Class A2	above 0°C		Particulate contaminate 5.0 mg/l or lower

Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.

Procedures

Adjust Valve Clearance adjustment

Tools: Feeler gauge, Wrench

Check valves when engine is cold.
Rotate crankshaft clockwise to bring each piston to top dead center on compression stroke.
Measure clearance with feeler gauge in firing order 1-3-4-2.
Loosen lock nut on adjustment screw and insert feeler gauge.
Adjust until gauge slides with slight drag; tighten lock nut and recheck.
Replace rocker arm cover.

Check V-Belt Tension adjustment

Press belt at midpoint between crankshaft and alternator pulleys with thumb.
Correct tension allows about 10-12 mm (0.39-0.47 in.) deflection with 22 lbs (10 kg) force.
Adjust or replace belt if tension is incorrect.

Ring latch grip adjustment adjustment

⚠ Ensure the nut is fully tight before operating the latch.

Note interference or reason latch pawl will not engage pawl slot.
If pawl hits slot bracket or shelf, move it to allow pawl to rotate inside slot.
Latch pawl should operate within slot freely when latch handle rotates on removal.
With latch closed, loosen bottom nut. Turn top nut to change pawl position. Re-tighten bottom nut.
Ensure nut fully tight before operating latch.
Ideal latch: pawl swings into position on closing, pulls up, engages top of slot with increasing resistance.
When latch ring fully depressed, there should be firm compression of panel perimeter seal.
If you can lift a corner of top panel and see a space, latch is not tight enough.

SP-5 V-Belt Tension Check adjustment

Check tension and wear on the V-belt after every 50 hours.
Press belt with thumb at midpoint between crankshaft and alternator pulleys.
Tension is correct if belt can be depressed about .39 to .47 in. (10 - 12 mm) with 22 lbs. (10 kg) force.

SP-6 Valve Clearance Adjustment adjustment

Tools: Feeler gauge

Readjust valve clearance after first 50 hours; check every 500 hours thereafter.
Check the valves when the engine is cold.
Rotate crankshaft clockwise to bring each piston to top dead center on compression stroke in firing order 1-3-4-2.
Loosen lock nut on adjustment screw and insert feeler gauge between rocker arm and valve stem cap.
Adjust until feeler gauge slides with slight drag; tighten lock nut and recheck clearance.
Adjust remaining valves and replace rocker arm cover.

V-Belt Tension adjustment

Check tension and wear after first 50 hours and every 50 hours.
Press belt at midpoint between crankshaft and alternator pulleys with thumb.
Correct tension is about 10-12 mm deflection with 10 kg (22 lbs.) force.
Adjust or replace belt if tension or wear is incorrect.

Valve Clearance Adjustment adjustment

Tools: feeler gauge

Check valves when engine is cold.
Rotate crankshaft clockwise to bring piston to TDC compression.
Align pulley notch with pointer and confirm No. 1 valves rock.
Measure each valve clearance with feeler gauge in firing order 1-3-4-2.
Loosen lock nut and turn adjustment screw until gauge slides with slight drag.
Tighten lock nut and recheck clearance.
Replace rocker arm cover.

Valve Clearances adjustment

Tools: Feeler gauge

Readjust valve clearance after first 50 hours; check every 500 hours thereafter.
Check valves when engine is cold.
Rotate crankshaft clockwise to bring each piston to top dead center on compression stroke.
Measure each valve clearance with feeler gauge in firing order 1-3-4-2.
Loosen lock nut and adjust screw until feeler gauge slides with slight drag; tighten lock nut and recheck.
Replace rocker arm cover.

Valve Clearances (SP-6) adjustment

Tools: Feeler gauge, Wrenches

Readjust valve clearance after first 50 hours; check every 500 hours thereafter.
Check the valves when the engine is cold.
Rotate crankshaft clockwise to bring each piston to top dead center on the compression stroke; notch on pulley aligns with pointer and No. 1 cylinder valves rock.
Measure each valve clearance with a feeler gauge in firing order 1-3-4-2.
Loosen lock nut on adjustment screw, insert feeler gauge, adjust until it slides with slight drag, tighten lock nut and recheck.
Adjust remaining valves and replace the rocker arm cover.

Shutdowns and Alarms diagnostic

⚠ Do not remove water fill cap of overheated engine; allow to cool and remove slowly.

Units have shutdown systems for high water temperature or low oil pressure.
Generator sets have shutdown systems, no warning horns.
Optional alarms and shutdowns are available.
When activated, engage preheat switch to check temperature gauge.
If above 205°F (96°C), use Troubleshooting Guide to isolate overheat cause.
Make repairs and restart after temperature gauge registers below 200°F (94°C).
If shutdown activated but temperature normal, check exhaust temperature/impeller/strainer.
Check crankcase oil level; if low, fill with recommended oil and restart.
If oil level normal, do not restart; call dealer.

Install siphon break installation

⚠ Generator sets with wet exhaust near or below water line must use a siphon break to prevent backflow. Backflow can ruin an engine and possibly sink the vessel.

Note two plugged penetrations in top left corner of rear panel. These are ports for siphon break lines.
Remove white plastic hole plugs from inside and replace with two rubber grommets (item 14).
Disconnect hose from sea water pump output and heat exchanger inlet.
Replace single hose with two 3/4" ID lines, one from sea water output, other to heat exchanger inlet.
Hoses must allow mounting siphon break minimum 12 inches above vessel's loaded water line.
Pass lines through two holes in rear panel as indicated per diagram.
See 'Exhaust' section of IM 1000 Installation Manual.

Step 11: Insert hole plugs and sound foam installation

Install 3x 1" white hole plug (item 10) when front valence (item 16) is secured.
Following completion of front valence, install side valence sound foam (item 15), typical each side.

Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.

Parts cataloged across the Northern Lights 944 family

121

Part #	Description	Category
24-21003	Air Filter	Air filter
24-21202	Air filter	Air filter
24-21203	Air filter (outer)	Air filter
24-21204	Air filter	Air filter
40-01201	Drive Belt 31/64” x 46-3/8” (former 40-05404)	Belt
40-05404	Drive Belt	Belt
40-15001	Belt	Belt
40-45401	Drive Belt	Belt
24-51201	Fuel filter	Fuel filter
11-11201	Gasket, Thermostat Housing	Gasket
32A0102204	Head Gasket	Gasket
32A0112300	Head Gasket	Gasket
32A0413200	Gasket, Rocker Arm Cover	Gasket
32A0714201	Gasket	Gasket
32A3000201	Gasket, Intake Manifold	Gasket
32A3200200	Gasket, Exhaust Manifold Mounting	Gasket
32A3201400	Gasket, Exhaust	Gasket
32A3203300	Gasket, Turbo Exhaust Outlet	Gasket
32A3911200	Gasket	Gasket
32A4510400	Gasket, Pump Cover	Gasket
32A4510500	Gasket, Water Pump	Gasket
32A4601400	Gasket	Gasket
32A4601800	Gasket	Gasket
32A6156900	Nozzle Gasket	Gasket
3423200300	Gasket	Gasket
3433004300	Gasket, Air Inlet	Gasket
3433604100	Gasket, Oil Line	Gasket
3434000700	Gasket	Gasket
32A6603100	Glow Plug	Glow plug
32A6607011	Glow Plug 12 V	Glow plug
32A6607021	Glow Plug 24 V	Glow plug
145536051	Hose	Hose
18-11203	Hose, Raw Water Pump Outlet	Hose
18-11205	Hose 5/8” ID x 1-3/4” Silicone	Hose
18-21205	Hump Hose 4-1/8” ID x 2” ID x 4-1/4” LOA With 1/2” Vent Hole	Hose
18-21208	Hose, Crankcase Breather Inlet 1" ID Molded *	Hose
18-21209	Hose, Crankcase Breather Inlet 1" ID Molded *	Hose
18-21210	Hose 3/8” ID x 24”	Hose
18-31201	Hose, 5/8” ID x 3”	Hose
18-35401	Hose 3/4”ID X 36” Wire Reinforced	Hose
18-51208	Hose 1/4” ID x 4”	Hose
18-51209	Hose 1/4” ID x 5-1/2”	Hose
18-53114	Hose Assembly 1/4" ID x 14-1/2"	Hose
18-53115	Hose Assembly 1/4" ID x 22"	Hose
18-53702	Hose 3/8” ID x 27” Push-On	Hose
68900391	Hose, Radiator Outlet	Hose
68900392	Hose, Radiator Inlet	Hose
25-11011	Impeller with Gasket	Impeller
25-11216	Impeller	Impeller
32A6103040	Fuel Injector	Injector
32A6157400	Nozzle	Injector
32C6106000	Fuel Injector	Injector
3466102000	Nozzle	Injector
24-01201	Lube oil filter	Oil filter
0482623500	Expansion Plug	Service part / kit
185446219	Flywheel, complete	Service part / kit
22-51201	Solenoid 24 Volt	Service part / kit
22-51202	Solenoid (24 Volt)	Service part / kit
32A0701501	Dowel Pin	Service part / kit
32A0702600	Bolt, Bearing Cap	Service part / kit
32A0741010	Cylinder Block Assembly (includes keys 1- 16)	Service part / kit
32A0744010	Cylinder Block Assembly (includes keys 1- 16)	Service part / kit
32A09-00010	Main Bearing Set, Standard	Service part / kit
32A09-00020	Main Bearing Set, Undersize 0.25 mm	Service part / kit
32A09-00030	Main Bearing Set, Undersize 0.50 mm	Service part / kit
32A09-00040	Main Bearing Set, Undersize 0.75 mm	Service part / kit
32A2000014	Crankshaft Assembly (M944W3, M30CW3, NL944D3, includes keys 2-5)	Service part / kit
32A2002101	Pulley	Service part / kit
32A2002203	Pulley	Service part / kit
32A2100051	Flywheel Assembly SAE #11-1/2 (M944T3 - M40C3 - NL944D3 & NL944T3, includes key 8)	Service part / kit
32A2300101	Gear	Service part / kit
32A2300301	Gear	Service part / kit
32A2303500	Idler Shaft	Service part / kit
32A8703100	Solenoid (12 Volt)	Service part / kit
32A8705900	Solenoid 12 Volt	Service part / kit
32A8707060	Solenoid 12 Volt NL944D3	Service part / kit
32B09-08101	Thrust Bearing, Standard	Service part / kit
32B09-08201	Thrust Bearing, Oversize 0.15 mm	Service part / kit
32B09-08301	Thrust Bearing, Oversize 0.30 mm	Service part / kit
32B1200301	Flywheel Housing SAE #3	Service part / kit
3430702100	Plug, Cam	Service part / kit
38-01204	Northern Lights standard spare parts kit (alternate P/N to 38-01207)	Service part / kit
38-01205	Northern Lights world class spare parts kit (also 38-01209)	Service part / kit
38-01207	Northern Lights standard spare parts kit (also 38-01204)	Service part / kit
38-01209	Northern Lights world class spare parts kit (alternate P/N to 38-01205)	Service part / kit
F284605000	Dowel Pin	Service part / kit
F284610000	Dowel Pin	Service part / kit
F285004008	Spring Pin	Service part / kit
MF241282	Bolt with washer	Service part / kit
ONL944	Industrial Generator Set Component Locations	Service part / kit
RE552766	Crankcase Breather Assembly	Service part / kit
25-11202	Raw Water Pump	Pump
32A3510012	Oil Pump Assembly	Pump
32A6501740	Injection Pump Assembly, 1500/1800 RPM (includes keys 12, 14-15)	Pump
32A6504710	Injection Pump Assembly, 1500/1800 RPM (includes keys 11-12)	Pump
32B4510032	Coolant Pump Assembly (includes keys 4-7)	Pump
3446109050	Fuel Feed Pump Assembly (includes all keys)	Pump
052300400	O-ring	Seal
11-10015	Thermostat Seal Ring	Seal
16-11201	O-ring	Seal
25-11208	Lip Seal	Seal
25-11209	O-ring	Seal
25-11211	O-ring	Seal
25-12017	Spline Seal	Seal
25-19508	Seal, Mechanical/Carbon	Seal
25-19517	O-Ring	Seal
32A0711700	Side Seal	Seal
3440711090	Rear Main Crankshaft Seal	Seal
22-40233	Oil Pressure Switch	Sensor
22-40938	Switch, Temperature 210F N.O./N.C. ISO Ground 3/8 NPT	Sensor
22-40939	Temperature Switch 130oF 3/8 NPT	Sensor
22-40944	Temperature Sender 2500F, Standard Ground 3/8 NPT (former #22-41025)	Sensor
22-41016	Oil Pressure Sender	Sensor
22-41025	Temperature Switch	Sensor
22-42055	Sender, Water Temperature - Single Station	Sensor
22-42070	Switch, High Exhaust Temperature & Harness Assembly	Sensor
22-44810	Sender, Water Temperature - Single Station	Sensor
22-45201	Temperature Sender 250°F Standard Ground	Sensor
MC880900	UNIT OVER HEAT WARNING	Sensor
32A4602100	Thermostat	Thermostat
35-11000	Thermostat, 180°F/82°C	Thermostat

Parts cataloged across all variants of this engine family — verify the exact part fits your specific variant and serial number before ordering.

Common questions

What is the oil capacity of the Northern Lights L944?

The Northern Lights L944 engine has an oil capacity of 10.0 liters.

What is the displacement of the Northern Lights L944?

The Northern Lights L944 has a displacement of 3.3 liters with 4 cylinders.

Which generators use the Northern Lights L944 engine?

The Northern Lights L944 powers 3 generator set(s), including Northern Lights M944, Northern Lights NL944D3, Northern Lights NL944T3.

How often should you change the oil in the Northern Lights L944?

The Northern Lights L944 oil change interval is every 250 hours.

What is a common problem with the Northern Lights L944 engine?

A commonly reported issue on generators using the Northern Lights L944 is: Engine Hard to Start or Will Not Start. Cause: Improper starting procedure. Fix: See starting section of this manual. Take special note of Bypass Switch operation..