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Northern Lights 844L Engine

The Northern Lights 844L is a 2.22 L 4-cylinder natural engine rated at 1800 rpm. It powers generator sets from Northern Lights, including the M20C, M844L, M844LW3 and ML844L. It holds 8.2 L (2.2 gal) of oil and 3.6 L (1.0 gal) of coolant.

Also known as: 844L, Lugger 844L

Part of the Northern Lights 844 engine family — 10 variants share parts & fitment.

2.216 L

Displacement

Cylinders

1800 rpm

Rated speed

8.2 L

Oil capacity

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

Engine specifications

Oil capacity	8.2 L
Coolant capacity	3.6 L
Displacement	2.216 L
Cylinders	4
Aspiration	Natural
Rated speed	1800 rpm

Generator sets powered by this engine

Northern Lights M20C Northern Lights M844L Northern Lights M844LW3 Northern Lights ML844L Northern Lights NL844 Northern Lights NL844LW2

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 load
Starter cranks slowly
Cause: Low battery output: Batteries too small; Battery cables too small
Fix: Check specific gravity of each battery; Replace battery if necessary
Engine runs irregularly or stalls frequently
Cause: Below normal engine temperature
Fix: Remove and check thermostat
Engine Overheats
Cause: Low coolant level
Fix: Fill tank or radiator to proper level; check hoses for loose connections and leaks
High Fuel Consumption
Cause: Improper type of fuel
Fix: Use correct fuel for temperature
Starter inoperative
Cause: Check DC circuit breaker
Fix: If the breaker is tripped, reset it
Entire electrical system does not function
Cause: Check DC circuit breaker
Fix: If breaker is tripped, reset it
Engine Emits Black or Gray Exhaust Smoke
Cause: Clogged or dirty air cleaner
Fix: Service air cleaner
Battery will not charge
Cause: Loose or corroded connections
Fix: Clean and tighten battery connections
Engine Knocks
Cause: Insufficient oil
Fix: Call your dealer
Engine Emits White Smoke
Cause: Improper fuel
Fix: Use correct fuel for temperature
Low Oil Pressure
Cause: Low oil level
Fix: Fill crankcase to proper level
High Oil Consumption
Cause: Break-in period
Fix: Oil consumption decreases after break in
Engine Malfunctions at High Output Range
Cause: Fuel supply insufficient
Fix: Air in fuel system or clogged fuel filter element.

Compiled from service & troubleshooting documentation across every generator set that uses the Northern Lights 844L.

Maintenance schedule

Item	Spec	Capacity	Part #	Interval
Air filter			24-23100	1000 hr	Amazon eBay FridayParts $193.84
Fuel filter	primary		24-50012	500 hr	Amazon eBay NAPA $65.23
Oil filter	Primary and secondary fuel filter elements		24-03100	250 hr	Amazon eBay $23.45 NAPA $12.88
Battery	electrolyte level		—	250 hr
Belt	Inspect and replace belts as needed. V-belts: 120 hours; Fan belts: 600 hours.		—	120 hr
Coolant			—	2500 hr
Oil	Every 250 hours	8.2 gallons	—	250 hr
Spark plug	Every 1500 hours		—	1500 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	Check	50 hr		First service — After first 50 hours and every 50 hours (SP18)
Cylinder head bolts	Adjust	50 hr		First service — Re-tighten head bolts after first 50 hours (see pg. 14)
Engine oil	Change	250 hr		First service — SP2 - first 50 hours (break-in)
Valve clearances	Adjust	50 hr		First service — After first 50 hours (SP6)
Valves	Adjust	50 hr		First service — SP6 - After first 50 hours
Batteries, cables and cable terminals	Clean	100 hr		Clean corrosion with water and baking soda solution; tighten and grease terminals
Battery electrolyte level	Check	100 hr		SP17 - every 100 hours
Battery terminals/cables	Clean	100 hr		Clean corrosion, tighten and grease terminals
Electrolyte level in batteries	Check	100 hr		SP18
Radiator (industrial only)	Clean	100 hr		EVERY 100 HOURS (SP16); check and clean radiator fins
V-belt tension	Check	100 hr		First service — SP5 - daily per SP-5 text, 100 hours on chart
Battery condition	Check	200 hr		SP18 - check condition with hydrometer every 500 hours (chart row 200 hours)
Battery condition	Test	200 hr		Check condition; hydrometer check every 500 hours
Condition of batteries	Check	200 hr		SP19
Engine oil and filter	Change	250 hr	12 mo	First service — Then every 200 hours
Air cleaner	Check	250 hr		SP4; more often in dusty conditions
Batteries	Check	250 hr		SP19 - Check state of charge of batteries with hydrometer
Batteries	Test	250 hr		Check condition of batteries with hydrometer
Batteries state of charge	Check	600 hr		Hydrometer check (SP19)
Batteries state of charge	Test	250 hr		Check condition with hydrometer (SP19)
Battery state of charge	Check	250 hr		Check condition with hydrometer (SP19)
Lube oil filters	Change	250 hr		First service — SP3; also at 100 hours then every 250 hours
Radiator	Clean	250 hr		Check and clean radiator (SP15)
Radiator fins	Clean	250 hr		Check and clean radiator fins (SP15)
Exhaust elbow	Check	500 hr		SP16
Exhaust elbow	Inspect	500 hr		Sooner if needed; replace if rust or damage
Exhaust system	Inspect	500 hr		Inspect condition of exhaust system (SP22)
Primary fuel filter element	Change	500 hr		SP8 - or as often as necessary; immediately if bowl fills with water
Primary fuel filter element (Racor)	Change	500 hr		SP8; as often as necessary
Raw water pump impeller	Replace	500 hr		Or as needed
Secondary fuel filter	Change	500 hr		SP9 - every 500 hours
Cooling system	Clean	2500 hr	12 mo	EVERY 600 HOURS or every 12 months, whichever comes first; check and flush (SP14)
Impeller (seawater pump, marine)	Change	600 hr		EVERY 600 HOURS or as needed (SP17)
Air cleaner element	Change	1000 hr		SP4 - every 1000 hours
Impeller in raw water pump	Change	1000 hr		SP17; or as needed
Injectors	Check	1000 hr		SP12 - clean injection nozzles every 1500 hours
Raw water pump impeller	Change	1000 hr		SP17 - Every 1000 hours or as needed
Valve clearance	Adjust	1000 hr		SP6 - after 1000 hours or as needed
Valve clearance	Check	1000 hr		SP6 - also adjust after 1000 hours or as needed
Valve clearances	Check	1000 hr		SP6 - Every 1000 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 below filler cap sealing surface	about 1 in. (2.5 cm)	in / cm	engine cold
Clearance	Enclosure left hand side and rear distance from vessel bulkheads (minimum)	4	in
Clearance	Enclosure left hand side and rear distance from vessel bulkheads (recommended)	6	in
Clearance	Heat rejection to jacket coolant (M844K2)	1018	BTU/min	60 Hz
Clearance	Heat rejection to jacket coolant (M844LK2)	1273	BTU/min	60 Hz
Clearance	Panel perimeter clearance (minimum) around panel perimeter, except bottom of side and front panels	1/32	in
Clearance	Siphon break height above vessel's loaded water line (minimum)	12	in
Clearance	V-belt deflection	3/16	in	at midpoint between crankshaft and alternator pulleys
Clearance	V-belt deflection at midpoint between crankshaft and alternator pulleys	3/16	in	also 5 mm; fan belt slackness about 3/16 in
Gap	V-belt deflection at midpoint between crankshaft and alternator pulleys	3/16 in. (5 mm)	in / mm	thumb pressure
Gap	V-belt deflection at midpoint between crankshaft and alternator pulleys	5	mm
Gap	V-belt tension (deflection at midpoint between crankshaft and alternator pulleys)	3/16	in. (5 mm)	thumb pressure
Gap	V-belt tension (deflection at midpoint between crankshaft and alternator pulleys)	about 3/16	in. (5 mm)
Other	Coolant level below filler cap sealing surface (cold)	1	in	engine cold
Other	Coolant level below filler cap sealing surface (cold)	2.5	cm	engine cold
Other	Cooling water maximum chlorides	40	ppm	also 2.5 grains per gallon
Other	Cooling water maximum dissolved solids	340	ppm	also 20.0 grains per gallon
Other	Cooling water maximum sulfates	100	ppm	also 5.9 grains per gallon
Other	Cooling water maximum total hardness	170	ppm	also 10.0 grains per gallon
Other	Cooling water pH level	5.5 to 9.0
Other	Exhaust Gas Temperature	1022	°F (550° C)
Other	Maximum Exhaust Backpressure	48	in (1219 mm) H2O
Other	V-belt deflection	3/16 in. (5 mm)	in. (mm)	thumb pressure at midpoint between crankshaft and alternator pulleys
Pressure	Compression pressure of cylinder - standard value	more than 2.94	MPa
Pressure	Compression pressure of cylinder - standard value	more than 30	kgf/cm2
Pressure	Compression pressure of cylinder - time to be repaired	less than 2.45	MPa
Pressure	Compression pressure of cylinder - time to be repaired	less than 25	kgf/cm2
Pressure	Compression pressure of cylinder, standard value	More than 2.94	MPa	also more than 30 kgf/cm2
Pressure	Compression pressure of cylinder, time to be repaired	Less than 2.45	MPa	also less than 25 kgf/cm2
Pressure	Coolant filler cap pressure valve release	7	PSI (0.5 bar)
Pressure	Coolant filler cap pressure valve release	approximately 7	PSI (0.5 bar)
Pressure	Coolant filler cap release pressure	approximately 7 PSI (0.5 bar)	PSI (bar)
Pressure	Coolant filler cap relief pressure	approximately 7	PSI (0.5 bar)
Pressure	Coolant filler cap relief valve	7	PSI
Pressure	Cooling system filler cap pressure valve release	approximately 7 PSI (0.5 bar)	PSI
Pressure	Cooling system filler cap relief	7	PSI
Pressure	Engine oil pressure	above 15 PSI; normal reading 20-60 PSI	PSI	engine running, gauges monitored often
Pressure	Engine oil pressure (minimum)	above 15	PSI
Pressure	Engine oil pressure (normal operating, Series 3-4 panels)	20-60	PSI	after a few seconds of operation
Pressure	Engine oil pressure (normal)	20-60	PSI	after a few seconds of operation
Pressure	Minimum oil pressure	15	PSI	must be above 15 PSI while running
Pressure	Minimum oil pressure	above 15	PSI	operating
Pressure	Minimum oil pressure while operating	above 15 PSI	PSI	units with Series 3 and Series 4 panels
Pressure	Normal engine oil pressure	20 - 60	PSI	after a few seconds of operation
Pressure	Normal oil pressure	20-60	PSI	after a few seconds of operation
Pressure	Normal oil pressure	20-60 PSI	PSI	after a few seconds of operation
Pressure	Oil pressure	20 - 60	PSI	Normal reading after a few seconds of operation
Pressure	Oil pressure (Series 3 and 4 panels, running)	above 15	PSI
Pressure	Oil pressure (minimum)	above 15	PSI	Series 3 and Series 4 Control Panels while operating
Pressure	Oil pressure (minimum, operating)	above 15	PSI
Pressure	Oil pressure (normal reading)	20 - 60	PSI	after a few seconds of operation
Pressure	Oil pressure (normal)	20 - 60	PSI
Pressure	Oil pressure (operating minimum)	above 15	PSI	engine running
Pressure	Oil pressure shutdown	14.2	psi (1.0 Kg/ccm)
Pressure	Radiator filler cap pressure valve release	7	PSI	also 0.5 bar
Pressure	Radiator filler cap relief pressure	0.5	bar	approximately
Pressure	Radiator filler cap relief pressure	7	PSI	approximately
Pressure	Recommended pressure cap	12.7	psi (0.9 kg/ccm)
Resistance	Glow plug resistance	under 1	ohm	between terminal and engine block
Resistance	Glow plug resistance (terminal to engine block)	under 1	ohm

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% distilled water / 50% ethylene glycol antifreeze mix	Distilled, deionized or soft water preferred		5.0 liters	Engine only capacity .95 gal (3.6 liters); good year-round coolant
Coolant	50% water / 50% conventional ethylene glycol antifreeze	low silicate			Good year round coolant; do not use methyl alcohol based antifreeze
Coolant	50% water / 50% ethylene glycol antifreeze mix				Recommended as a good year-round coolant
Engine oil	Diesel-rated break-in oil	John Deere pre-packaged or equivalent			Use during the first 100 hours
Engine oil	SAE 5-20W	API Service CC/CD/SF multi-viscosity	below -23°C		Below -10°F (-23°C) multi-viscosity; some increase in oil consumption may be expected
Engine oil	SAE 5W	API Service CC/CD/CE or CC/CD/SF	below -23°C		Below -10°F (-23°C). Multi-viscosity alternative SAE 5-20W.
Engine oil	SAE 5W (single viscosity) / SAE 5-20W (multi-viscosity)	API Service CC/CD/CE single viscosity oils; API Service CC/CD/SF multi-viscosity oils	below -23°C		Below -10°F (-23°C); some increase in oil consumption may be expected
Engine oil	SAE 5W single viscosity / SAE 5-20W multi-viscosity	API Service CC/CD/CE or CC/CD/SF	below -23°C	8.2 liters	Below -10°F (-23°C); expect increased oil consumption with SAE 5W and 5-20W
Engine oil	SAE-5W	API Service CC/CD/CE single viscosity	below -23°C		Below -10°F (-23°C) single viscosity
Engine oil	Service CC 30 weight			8.2 liters	Use during the first 100 hours (break-in)
Engine oil	SAE 10-30W	API Service CC/CD/SF multi-viscosity	-23°C to 0°C		-10 to 32°F (-23 to 0°C) multi-viscosity
Engine oil	SAE 10W	API Service CC/CD/CE or CC/CD/SF	-23°C to 0°C		-10 to 32°F (-23 to 0°C). Multi-viscosity alternative SAE 10-30W.
Engine oil	SAE 10W (single viscosity) / SAE 10-30W (multi-viscosity)	API Service CC/CD/CE single viscosity oils; API Service CC/CD/SF multi-viscosity oils	-23°C to 0°C		-10 to 32°F (-23 to 0°C)
Engine oil	SAE 10W single viscosity / SAE 10-30W multi-viscosity	API Service CC/CD/CE or CC/CD/SF	-23°C to 0°C	8.2 liters	-10 to 32°F (-23 to 0°C)
Engine oil	SAE-10W	API Service CC/CD/CE single viscosity	-23°C to 0°C		-10 to 32°F (-23 to 0°C) single viscosity
Engine oil	SAE 15-40W	API Service CC/CD/SF multi-viscosity	above 0°C		Above 32°F (0°C) multi-viscosity
Engine oil	SAE 30W	API Service CC/CD/CE (single viscosity) or CC/CD/SF (multi-viscosity)	above 0°C	8.2 liter	Above 32°F (0°C). Multi-viscosity alternative SAE 15-40W. Crankcase capacity including oil filter 2.1 gal (8.2 liter) for 844k/844Lk.
Engine oil	SAE 30W (single viscosity) / SAE 15-40W (multi-viscosity)	API Service CC/CD/CE single viscosity oils; API Service CC/CD/SF multi-viscosity oils	above 0°C		Above 32°F (0°C)
Engine oil	SAE 30W single viscosity / SAE 15-40W multi-viscosity	API Service CC/CD/CE or CC/CD/SF	above 0°C	8.2 liters	Above 32°F (0°C)
Engine oil	SAE-30W	API Service CC/CD/CE single viscosity	above 0°C	2.1 gal (8.2 liters)	Above 32°F (0°C) single viscosity
Fuel	ASTM D975 Grade No. 1 diesel	ASTM D975	below 0°C		Below freezing and all temperatures above 5,500 ft (1500 meters); biodiesel B5 from BQ-9000 producer, B20 must meet ASTM D6751/EN14214, use within 90 days
Fuel	Grade No. 1 diesel	ASTM D975	below 0°C		Use below freezing and for all temperatures above 5,500 ft (1500 m)
Fuel	Grade No. 2 diesel above freezing 32°F (0°C); Grade No. 1 below freezing and above 5,500 ft. (1500 meters)	ASTM designation D975 for diesel fuels; cetane number minimum of 45; sulphur less than 1% (preferably less than 0.5%)			Do not use domestic heating oils, Class B engine, Class D domestic fuels, Class E/F/G/H industrial or marine fuels, ASTM-D975-60T No. 4-D and higher number fuels
Fuel	Grade No. 2 diesel above freezing 32°F (0°C); Grade No. 1 below freezing and for all temperatures above 5,500 ft (1500 m) altitude	ASTM D975			Low sulphur or ultra low sulphur; cetane number minimum 45. Do not use domestic heating oils, Class B, Class D, Class E/F/G/H industrial or marine fuels, or ASTM-D975-60T No. 4-D and higher
Fuel	No. 1 diesel	ASTM D975	below 0°C		Below freezing and for all temperatures at an altitude above 5,500 ft (1500 m).
Fuel	ASTM D975 Grade No. 2 diesel	ASTM D975	above 0°C		Above freezing 32°F (0°C); cetane number minimum 45; sulfur less than 1% (preferably less than 0.5%)
Fuel	Grade No. 2 diesel	ASTM D975	above 0°C		Use above freezing 32°F (0°C); cetane minimum 45; sulphur less than 1% (preferably less than 0.5%)
Fuel	Grade No. 2 diesel above freezing; Grade No. 1 below freezing and at altitudes above 5,500 ft. (1500 meters)	ASTM designation D975; sulphur less than 1% (preferably less than 0.5%); cetane number minimum of 45	above 0°C		Do not use domestic heating oils, Class B, Class D, Class E/F/G/H industrial or marine fuels, or ASTM-D975-60T No. 4-D and higher
Fuel	No. 2 diesel	ASTM D975	above 0°C		Above freezing 32°F (0°C). Sulphur less than 1% (preferably less than 0.5%); cetane minimum 45.
Other	Rubber lubricant				Applied to inside of short blue silicone hose and to exhaust hole grommet during wet exhaust tube installation

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

Procedures

Adjusting V-Belt Tension adjustment

Check tension and wear on the V-belt daily.
Press on the belt at the midpoint between crankshaft and alternator pulleys; correct tension allows about 3/16 in. (5 mm) deflection.
Loosen the alternator adjusting plate bolt and the alternator mounting bolt.
Pivot the alternator at the mounting bolt as needed.
Tighten the mounting bolt and the adjusting bolt.
Operate engine at low idle speed and recheck belt tension.

Adjusting Valve Clearances adjustment

Tools: Feeler gauge, Wrench

Bring No. 1 cylinder to top dead center on compression stroke.
Align top mark of crank pulley with timing gear case mark.
Loosen lock nut and adjust clearance with adjustment screw.
Clearance on both intake and exhaust valves: 0.008 in. (0.2 mm).
Repeat for each cylinder; adjust each set of valves individually.
Replace rocker arm cover and tighten cover nuts to 5 - 8 ft/lbs.

Retightening cylinder head bolts adjustment

Tools: Torque wrench

Retighten the head bolts after the first 50 hours.
Tighten bolts when the engine is cold.
Loosen the valve cover and remove the rocker arm cover.
Tighten head bolts with a torque wrench in the sequence shown, evenly in 1 or 2 passes.
Tighten to specified torque in final pass.

SP-6 Valve Clearances adjustment

Tools: Feeler gauge, Wrench

Adjust valve clearance after 1000 hours or as needed.
Bring No. 1 cylinder to top dead center on the compression stroke; align top mark of crank pulley with timing gear case.
Remove the rocker arm cover and turn the crankshaft forward and backward to confirm TDC.
Loosen the lock nut and adjust clearance between rocker arm and valve guide with the adjustment screw.
Repeat steps 3 and 4 for each cylinder; adjust each valve set individually.
Replace the rocker arm cover and tighten cover nuts.

SP6 Valve Clearances adjustment

⚠ Valve adjustments should be done after the cylinder head bolts have been re-tightened.

Tools: adjustment screw, lock nut wrench

Adjust valve clearance after 1000 hours or as needed; engine must be cold and NOT running.
Turn the engine over by hand until the inlet valve starts to open and exhaust starts to close (valves rocking).
Turn the crankshaft one more full turn; align the top mark of the crank pulley with the top mark of the timing gear case.
Loosen the lock nut and adjust clearance between rocker arm and valve guide with the adjustment screw.
Clearance on both intake and exhaust valves should be 0.008 in. (0.2 mm).
Repeat for each cylinder; each set of valves must be adjusted individually.
Replace the rocker arm cover and tighten cover nuts to 5 - 8 ft/lbs (0.8 - 2.3 kg/m).

Valve Clearance Adjustment adjustment

Tools: feeler gauge, wrench

Adjust valve clearance after first 50 hours, then at 1000 hours or as needed.
Engine should be cold and NOT running.
Turn engine by hand until inlet valve starts to open and exhaust valve starts to close.
Turn crankshaft one more full turn; align top mark of crank pulley with TOP mark of timing gear case.
Loosen lock nut and adjust clearance between rocker arm and valve guide with adjustment screw.
Repeat for each cylinder; each set of valves adjusted individually.
Replace rocker arm cover and tighten cover nuts.

Valve Clearance Adjustment (SP-6) adjustment

Tools: Feeler gauge, Wrench

Adjust valve clearance after 1000 hours or as needed.
Bring No. 1 cylinder to top dead center on compression stroke by aligning crank pulley timing mark.
Remove rocker arm cover and turn crankshaft to confirm TDC.
Loosen lock nut and adjust clearance between rocker arm and valve guide with the adjustment screw.
Repeat for each cylinder; each set of valves adjusted individually.
Replace rocker arm cover and tighten nuts.

Valve clearance adjustment (SP6) adjustment

Readjust valve clearance after first 50 hours of operation and every 600 hours thereafter.
Valve adjustments should be done after the cylinder head bolts have been retightened.
Engine should be cold and NOT running.
Turn engine by hand until inlet valve starts to open and exhaust valve starts to close.
Turn crankshaft one more full turn and adjust clearance on both valves for this cylinder.
Loosen lock nut and adjust clearance between rocker arm and valve guide with adjustment screw.
Repeat for each cylinder; each set of valves must be adjusted individually.
Replace rocker arm cover.

Check glow plugs diagnostic

Tools: D.C. test bulb

Loosen the current carrying flat wire between the plus-poles of the glow plugs.
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.
Check all glow plugs and replace any faulty ones.

Checking glow plugs diagnostic

Tools: DC test bulb

Loosen the current carrying flat wire between the plus-poles of the glow plugs.
Connect a DC 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.
Check all glow plugs and replace any faulty ones.

Glow Plug Check diagnostic

Tools: D.C. test bulb

Loosen the current carrying flat wire between the plus-poles of the glow plugs.
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.
Check all glow plugs and replace any faulty ones.

Glow Plug Testing diagnostic

Tools: D.C. test bulb

Loosen the current carrying flat wire between the plus-poles of the glow plugs.
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.
Check all glow plugs and replace any faulty ones.

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

Voltage reconnection

Voltage	Phase	Connection	Notes
110/190	3	wye	Optional voltages (Wye) (NL844L)
110/220	1	zig zag	Optional voltage (NL844L)
115/230	1	zig zag	Optional voltage (NL844L)
120/208	3	wye	Standard low voltage (NL844L); also listed in optional voltages (Wye)
120/240			Optional voltages (GEN) (NL844L); standard output 1 phase, 1.0 power factor
120/240	1	zig zag	Optional voltage (NL844L)
127/220	3	wye	Standard low voltage (NL844L); also listed in optional voltages (Wye)
139/240	3	wye	Optional voltages (Wye) (NL844L)
220/380	3	wye	Standard high voltage (NL844L); also listed in optional voltages (Wye)
240/416	3	wye	Optional voltages (Wye) (NL844L)
254/480	3	wye	Optional voltages (Wye) (NL844L)
277/480	3	wye	Standard high voltage (NL844L)

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 844 family

300

Part #	Description	Category
24-20001	Air Filter	Air filter
24-22009	Element, Air Filter	Air filter
24-23100	Air cleaner element	Air filter
24-27302	Element	Air filter
24-28101	Air Filter Element	Air filter
24-28401	Air cleaner element (C-Series)	Air filter
24-28602	Air Filter Element	Air filter
314531065	Air Filter Element	Air filter
314531127	Element (marked #314531065)	Air filter
38-08120	Standard spare kit for M844DW3/G	Air filter
ONL844W3	Air Filter	Air filter
22-78701	High output alternator (40A iso ground) 12V w/ adj. regulator	Alternator
185446277	Regulator Assembly	Avr
22-40334	D.C. Voltage Regulator 12 Volt	Avr
080109061	Drive Belt (formerly #080109061)	Belt
080109080	Drive Belt (formerly #080109080)	Belt
40-02003	Drive Belt	Belt
40-02004	Drive Belt (with 24V/35A alternator)	Belt
40-02005	Drive Belt	Belt
40-08401	Drive Belt	Belt
40-08403	Drive Belt (M-844L & M-20CL)	Belt
40-08404	Drive Belt (with 24V/ 35A alternator)	Belt
40-08405	Drive Belt (with 24V/35A alternator: Bertram spec)	Belt
40-08601	Drive Belt	Belt
40-74500	Drive Belt (formerly #40-74500)	Belt
40-74501	Drive Belt (844L & M20CR, formerly #40-08404)	Belt
V-BELT-16X1.5	V-belt	Belt
185416480	Brush	Brush
185416490	Brush Assembly	Brush
185416500	Brush Holder Assembly	Brush
22-68304	Brush assembly	Brush
39-70006	Molded Plastic Case	Case
27-38008	SS Exhaust Elbow	Elbow
00-35406	Gas/Water Separator	Fuel filter
130306190	Fuel Filter Assembly	Fuel filter
24-50002	Primary fuel filter (Racor) complete unit	Fuel filter
24-50012	Primary fuel filter element	Fuel filter
24-50013	Primary Fuel Filter/Separator	Fuel filter
24-50014	Fuel filter	Fuel filter
24-52020	Fuel Filter	Fuel filter
24-58401	Fuel filter (final)	Fuel filter
24-58402	Fuel filter (primary)	Fuel filter
052100280	Gasket (Marine application only, formerly #054109013)	Gasket
052109074	Gasket	Gasket
054109013	Gasket	Gasket
11-12005	Oil Fill Neck Gasket	Gasket
11-13101	Gasket, Thermostat Cover	Gasket
11-18602	Gasket, Thermostat Cover	Gasket
11-28101	Gasket	Gasket
11-31902	Gasket	Gasket
11-38101	Gasket / Exhaust Manifold Gasket	Gasket
110996600	Gasket	Gasket
110996860	Gasket	Gasket
111147200	Head Gasket (formerly #111147200)	Gasket
111147460	Head Gasket; t = 0.5mm	Gasket
111147510	Head Gasket; t = 1.2 mm (844)	Gasket
111147520	Head Gasket; t = 1.3 mm (844)	Gasket
111147581	Head Gasket; t = 0.4 mm (844L & M20CR, formerly #111147580)	Gasket
111147591	Head Gasket; t = 0.5 mm (844L & M20CR, formerly #111147590)	Gasket
111996401	Gasket, Head Cover	Gasket
111996410	Gasket, Rocker Arm Cover	Gasket
111996420	Gasket, Rocker Arm Cover	Gasket
130326051	Gasket	Gasket
130516069	Gasket	Gasket
130516089	Gasket	Gasket
130516101	Gasket	Gasket
130996070	Gasket	Gasket
130996130	Gasket	Gasket
131186110	Gasket	Gasket
131296255	Gasket	Gasket
131426160	Gasket	Gasket
131426200	Gasket	Gasket
131426230	Gasket	Gasket
135996480	Gasket	Gasket
135996530	Gasket	Gasket
135996550	Gasket	Gasket
135996600	Gasket	Gasket
135996720	Gasket	Gasket
135996780	Gasket, Ind. Exhaust Manifold	Gasket
135996900	Gasket	Gasket
135996950	Gasket, Air Intake Mounting	Gasket
140996260	Gasket	Gasket
140996270	Gasket, Valve Assembly	Gasket
145996050	Gasket	Gasket
145996051	Gasket, Thermostat Cover	Gasket
145996360	Gasket	Gasket
145996370	Gasket	Gasket
145996460	Gasket	Gasket
145996670	Gasket	Gasket
145996680	Gasket	Gasket
165996110	Gasket	Gasket
165996351	Gasket	Gasket
165996361	Gasket	Gasket
165996510	Gasket, Gear Case Cover	Gasket
195906940	Gasket Set - Industrial	Gasket
195907330	Gasket Set – Industrial (includes keys #1 - #40)	Gasket
195907340	Gasket Set – Industrial (includes keys #1 - #40)	Gasket
198996060	Gasket	Gasket
198996071	Gasket	Gasket
29-08100	Gasket Set - Marine	Gasket
29-08101	Gasket Set – Marine (includes all keys)	Gasket
29-08401	Gasket Set – Marine (includes all keys)	Gasket
314531057	Gasket	Gasket
314531061	Gasket	Gasket
314990030	Gasket, Elbow	Gasket
185366060	Glow Plug, 12 Volt	Glow plug
185366100	Glow Plug, 24 Volt	Glow plug
185366220	Glow Plug, 12 Volt	Glow plug
38-08130	World class spare parts kit for M844DW3/G	Glow plug
GLOW-PLUG-10	Glow plug	Glow plug
130556750	Pipe	Hose
130556760	Pipe	Hose
131507450	Injection Line #1	Hose
131507460	Injection Line #2	Hose
131507470	Injection Line #3	Hose
131507480	Injection Line #4	Hose
131507520	Injection Line #1	Hose
131507530	Injection Line #2	Hose
131507540	Injection Line #3	Hose
131507550	Injection Line #4	Hose
131606560	Return Line	Hose
131606620	Return Line	Hose
135597330	Intake Hose	Hose
140606701	Oil Line	Hose
140606710	Drain Hose (Marine application only)	Hose
140606720	Oil Pipe (844 & 16C)	Hose
140607020	Oil Pipe (844L & 20CL)	Hose
145536050	Hose	Hose
145536640	Hose, Radiator Outlet	Hose
145536870	Hose, Radiator Inlet	Hose
145537260	Hose, Radiator Inlet	Hose
145537270	Hose, Radiator Outlet	Hose
145546510	Hose	Hose
18-11906	Vent Hose	Hose
18-12006	Hose 5/16" ID x 26" Polyvinyl	Hose
18-13107	Formed Hose	Hose
18-13108	Hose 3/4" ID x 18-1/2"	Hose
18-13109	Overflow Hose 5/16" ID x 25"	Hose
18-15408	Hose Assembly 1/4” ID x 15”	Hose
18-28101	Air Intake Hose (earlier)	Hose
18-28102	Air Intake Hose	Hose
18-52007	Hose 1/4" ID x 26"	Hose
18-52113	Hose Assembly 1/4" ID x 26-1/2"	Hose
18-52205	Hose 1/4"ID x 13"	Hose
18-58101	Hose Assembly 1/4" ID x 17" (844)	Hose
18-58401	Hose Assembly 1/4" ID x 26" (844L)	Hose
19-00064	Hose Clamp #64 (for tank mounting)	Hose
27-12004	Tube 5/16" ID x 30" Polyurethane	Hose
27-13101	Tube Assembly	Hose
25-11216	Impeller	Impeller
25-12060	Impeller	Impeller
131406360	Injector Assembly	Injector
131406480	Injector Assembly	Injector
131416170	Nozzle	Injector
W673-2	Manual	Manual
W843-844-2	Manual	Manual
140406360	Suction Filter	Oil filter
24-01201	Lube oil filter	Oil filter
24-02002	Oil Filter	Oil filter
24-03100	Lube oil filter	Oil filter
00-02003	Wear Sleeve; Repair Type	Service part / kit
00-02004	Wear Sleeve; Repair Type	Service part / kit
00-35400	Water Lift Type Muffler	Service part / kit
00-71614	Grommet 1-5/8"ID x 2-1/4"OD	Service part / kit
00-73146	Lifting Eye	Service part / kit
05-70049	Extrusion, vertical	Service part / kit
05-70051	Extrusion, horizontal, sides	Service part / kit
05-70052	Extrusion, horizontal, ends	Service part / kit
10-12002	Remote Expansion Tank (Includes key #16)	Service part / kit
110666060	Vent Filter	Service part / kit
110666090	Filter	Service part / kit
12-00031	Capscrew, Hex Head M6 x 1.0 x 25 mm	Service part / kit
12-00712	Capscrew, Hex Head M8 x 1.25 x 25 mm	Service part / kit
12-00751	Capscrew, Hex Head M8 x 1.25 x 16 mm	Service part / kit
130516084	Diaphragm	Service part / kit
135406230	Muffler Element	Service part / kit
14-04803	Hex Nut, Nylock M6 x 1.0	Service part / kit
145306550	Cooling Fan	Service part / kit
145506480	Heat Exchanger Element (earlier)	Service part / kit
15-00008	Flat Washer M6	Service part / kit
15-00701	Flat Washer M8	Service part / kit
15-00702	Lock Washer, Helical M8	Service part / kit
185206082	Stop Solenoid, 12 Volt - Standard Ground	Service part / kit
185206190	Stop Solenoid, 12 Volt - Isolated Ground	Service part / kit
185206200	24 Volt Solenoid	Service part / kit
185416300	Brush	Service part / kit
185446165	Spring	Service part / kit
185446187	Regulator Assembly	Service part / kit
185446253	Rectifier Assembly	Service part / kit
185446276	Rectifier Assembly	Service part / kit
185846360	Brush Holder Assembly	Service part / kit
185846361	Spring Brush / Brush Spring	Service part / kit
185886070	Spring	Service part / kit
20-18101	Heat Exchanger Element	Service part / kit
21-00010	Bushing, Steel 3/8NPT x 1/4NPT	Service part / kit
21-00135	Bushing, Brass 1/2NPT x 1/4NPT	Service part / kit
21-00701	Flat Washer M8	Service part / kit
21-05404	Male Elbow, 45° Steel 1/4NPT x 1/4-37T	Service part / kit
21-12007	Filler Cap (7 PSI)	Service part / kit
21-12008	Filler Cap	Service part / kit
21-51093	Male Connector, Brass 1/2 NPT x 1/2 HB	Service part / kit
21-52245	Male Elbow, Brass 1/4 NPT x 5/16-45T	Service part / kit
21-65005	Bushing, Steel 1" NPT x 3/8 NPT	Service part / kit
21-70007	Female Swivel, Brass 5/16 HB x 5/16-37T	Service part / kit
21-71042	Female Swivel, Brass 1/2 HB x 1/2-45T	Service part / kit
21-71049	Male Elbow, 90° Steel 1/4NPT x 1/4-37T	Service part / kit
21-71056	Female Swivel, Brass 5/16 HB x 5/16-45T	Service part / kit
21-71093	Male Connector, Brass 3/8 NPT x 1/2 HB	Service part / kit
22-40004	Resistor Kit	Service part / kit
22-40012	Resistor, 200 Ohm, 3 Watt (24 Volt Panel only)	Service part / kit
22-40018	Circuit Breaker 10 Amp	Service part / kit
22-41060	Diode, 6 Amp 50 Volt	Service part / kit
22-42043	Circuit Breaker	Service part / kit
22-42047	Relay, 12 Volt SPDT	Service part / kit
22-44852	12 Volt Bulb	Service part / kit
22-44853	24 Volt Bulb	Service part / kit
22-70048	Diode Harness Addition	Service part / kit
22-70280	Circuit Breaker 80A 240VAC	Service part / kit
22-70300	Circuit Breaker 100A 240VAC	Service part / kit
22-90009	Hour Meter	Service part / kit
23-73106	Bracket	Service part / kit
23-75404	Bracket, Tank Mtg.	Service part / kit
23-78007	TOE BRACKET	Service part / kit
25-12004	Repair Kit	Service part / kit
25-12061	Cam	Service part / kit
25-12062	Wear Plate	Service part / kit
25-12064	Bearing	Service part / kit
27-18301	Siphon Break	Service part / kit
27-31004	Dry Exhaust Flex	Service part / kit
27-31119	Dry Exhaust Flex	Service part / kit
27-31207	Dry Exhaust - Critical Residential	Service part / kit
27-31209	Dry Exhaust - Critical Residential	Service part / kit
27-32014	SS Exhaust Elbow	Service part / kit
28-41060	Diode	Service part / kit
31-12001	Port Adapter (requires #11)	Service part / kit
31-70001	Adapter, Oil Drain	Service part / kit
31-80002	Female Swivel, 1/4HB x 1/4-37T	Service part / kit
310110010	Radiator Cap	Service part / kit
310110200	Filler Cap	Service part / kit
33-82205	Platform Mount	Service part / kit
33-82206	Platform Mount	Service part / kit
33-82254	Mount	Service part / kit
33-83106	Platform Mount	Service part / kit
34-70010	Oil Drain Kit Complete (includes all keys)	Service part / kit
340460170	RW Pump Drive Gear	Service part / kit
36-72003	Drain Valve	Service part / kit
36-72005	Male Elbow, Brass 1/4 NPT x 5/16-45T	Service part / kit
37-40013	Hourmeter	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
38-01206	Standard Spare Parts Kit - KC	Service part / kit
38-01207	Northern Lights standard spare parts kit (also 38-01204)	Service part / kit
38-08420	Standard Spare Parts Kit - HE	Service part / kit
38-08430	Standard Spare Parts Kit - KC	Service part / kit
38-08700	Standard Spare Parts Kit - HE	Service part / kit
38-08701	World Class Spare Parts Kit - HE	Service part / kit
38-08702	Standard Spare Parts Kit - KC	Service part / kit
38-08703	World Class Spare Parts Kit - HE (KC series row as printed)	Service part / kit
512.00	HEAT EXCHANGER/EXPANSION TANK	Service part / kit
M20CRW3	Northern Lights 20 kW (@ 60 Hz) commercial grade	Service part / kit
M844LW3G	=	Service part / kit
OL844D-03/10	Service Record	Service part / kit
OM844W2-10/09	Battery connections	Service part / kit
ONL844T4E	Circuit breaker	Service part / kit
130506140	Feed Pump Assembly	Pump
131017600	Injection Pump Assembly	Pump
145016890	Coolant Pump Assembly (earlier)	Pump
145016891	Coolant Pump Assembly (formerly #145016890)	Pump
145017350	Coolant Pump Assembly	Pump
145017780	Coolant Pump Assembly (includes keys #2 - 5)	Pump
145017800	Coolant Pump Assembly (includes keys #2 - 5)	Pump
25-12057	Raw Water Pump	Pump
26-71003	Electric Fuel Pump 12V	Pump
26-71004	Electric Fuel Pump 24V	Pump
340460141	RW Pump Drive Gear	Pump
36-72002	Hand Pump	Pump
025100008	Seal Washer, Air Bleed Screw	Seal
025100010	Seal Washer	Seal
025100012	Seal Washer - Industrial	Seal
025100016	Seal Washer	Seal
050209083	Oil Seal	Seal
052100030	O-ring	Seal
052100050	O-ring	Seal
052100070	O-ring	Seal
052100100	O-Ring	Seal
052100150	O-Ring	Seal
052100400	O-ring	Seal
052109072	O-Ring	Seal
052109076	O-ring	Seal
052109078	O-ring, Relief Valve	Seal
052300400	O-ring	Seal
052300600	O-Ring	Seal
052300700	O-ring, Gear Case Cover	Seal
052400400	O-Ring	Seal
120406050	Valve Guide Seal - Exhaust	Seal
120406070	Valve Guide Seal - Intake	Seal
131226130	O-Ring	Seal
131226180	O-ring	Seal
131227240	O-Ring	Seal
16-13101	O-ring	Seal

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 844L?

The Northern Lights 844L engine has an oil capacity of 8.2 liters.

What is the displacement of the Northern Lights 844L?

The Northern Lights 844L has a displacement of 2.216 liters with 4 cylinders.

Which generators use the Northern Lights 844L engine?

The Northern Lights 844L powers 6 generator set(s), including Northern Lights M20C, Northern Lights M844L, Northern Lights M844LW3, Northern Lights ML844L, Northern Lights NL844.

How often should you change the oil in the Northern Lights 844L?

The Northern Lights 844L oil change interval is every 250 hours.

What is a common problem with the Northern Lights 844L engine?

A commonly reported issue on generators using the Northern Lights 844L 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.