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Northern Lights 844L Engine

Name: Northern Lights 844L Engine
Brand: Northern Lights

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

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

Temperature gauge shows temperature above 205°F (97°C)
Fix: Shut off the engine immediately. Use the Trouble Shooting Guide on page 21 to isolate the cause of the overheat.
Starter inoperative
Cause: Loose or corroded connections
Fix: Clean and tighten loose battery and harness plug connection
Starter cranks slowly
Cause: Batteries too small, Battery cables too small, Crankcase oil too heavy
Fix: Check specific gravity of each battery, Replace battery if necessary, Check electrolyte level of each battery, If low, fill cells with distilled water, Fill with oil of appropriate viscosity
Shutdown is activated and temperature gauge shows within normal range
Fix: Check the engine crankcase oil level. If 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. If the oil level is normal, DO NOT restart the engine. Call your dealer for assistance.
Low battery output
Cause: Sulfated or worn out batteries, Loose or defective electrical system ground wire
Fix: Check specific gravity of each battery, Check electrolyte level of each battery, Repair or replace
Lack of engine power
Cause: Engine overloaded, Intake air restriction, Clogged primary fuel filter element, Clogged secondary fuel filter element, Improper type of fuel
Fix: Reduce load, Service air cleaner, Clean or replace filter element, Replace filter element, Consult fuel supplier and use proper type of fuel for operating conditions
Entire electrical system does not function
Cause: Faulty connection, Sulfated or worn out batteries
Fix: Clean and tighten battery and harness plug connections, Check specific gravity and electrolyte level of each battery
Engine runs irregularly or stalls frequently
Cause: Below normal engine temperature, Clogged primary fuel filter element, Clogged secondary fuel filter element, Water or dirt in the fuel system, Dirty or faulty injection nozzles, Air in fuel system, Improper type of fuel
Fix: Remove and check thermostat, Clean or replace filter element, Replace secondary filter element, Drain, flush, fill and bleed system, Have your dealer check injection nozzles, Inspect clamps and hoses on suction side of fuel pump for air leak, Consult fuel supplier and use proper type of fuel for operating condition
Engine overheats
Fix: See 'Engine Overheats' in next category
Engine hard to start or will not start
Cause: Improper starting procedure, No fuel, Low battery output, Excessive resistance in starting circuit, Crankcase oil too heavy, Improper type of fuel, Water, dirt or air in fuel system, Clogged primary fuel filter element, Clogged secondary fuel filter element, Dirty or faulty injection nozzles
Fix: See starting section of this manual. Take special note of Bypass Switch operation, Check level of fuel in fuel tank, Check electrolyte level and condition, Clean and tighten all battery connections, Use oil of proper viscosity, Consult fuel supplier and use proper type of fuel for operating condition, Drain, flush, fill and bleed system, Clean or replace filter element, Replace filter element, Have your dealer check injection nozzles
Dirty or faulty injection nozzles
Fix: Replace injectors. Best done by dealer
Below normal engine temperature
Cause: Improper valve clearance
Fix: Reset valves. Best done by dealer
Battery will not charge
Cause: Loose or corroded connections, Sulfated or worn out batteries
Fix: Clean and tighten battery connections, Check specific gravity of each battery, Check electrolyte level of each battery
Temperature rises above 205°F (96°C) on Marine units
Fix: Repeat troubleshooting
Shutdown is activated and the temperature gauge shows temperature within normal temperature range
Fix: 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.

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
Oil filter	Primary and secondary fuel filter elements		24-03100	250 hr	Amazon eBay $23.45
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 — After first 50 hours (SP6)
Batteries	Check	100 hr		Batteries, cables and cable terminals should be checked and cleaned every 100 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	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	Change	1000 hr		SP15 - or as needed
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
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

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	3/16 in. (5 mm)	in. (mm)	at midpoint between crankshaft and alternator pulleys
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
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 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 (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
Resistance	Glow plug resistance (terminal to engine block)	under 1 ohm	ohm	measured with high quality meter
Speed	Frequency / speed reference	60 Hz (1800 RPM), 50 Hz (1500 RPM)	Hz / RPM

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 or CC/CD/CF	below -23°C		Below -10°F (-23°C)
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 or CC/CD/CF	-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 or CC/CD/CF	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	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.

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 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.

Shutdowns and Alarms diagnostic

⚠ Do not remove the water fill cap of an overheated engine. Escaping high temperature steam can cause severe burns.

⚠ If the oil level is normal, DO NOT restart the engine; call your dealer.

Engage the preheat switch to check the temperature gauge.
If above 205°F (96°C), use the Trouble Shooting Guide to isolate the cause of the overheat.
Make repairs; restart after the temperature gauge registers below 200°F (94°C).
Watch the temperature gauge regularly and turn off the unit if temperature rises above 205°F (96°C).
If shutdown activates within normal temperature, check exhaust temperature, sea water strainer and impeller.

Shutdowns and Alarms Response diagnostic

⚠ Do not remove the water fill cap of an overheated engine. Escaping high temperature steam can cause severe burns.

Check the temperature gauge; if above 205°F (96°C), shut off the engine immediately.
Use the Trouble Shooting Guide to isolate the cause of the overheat.
Make repairs. Restart the Marine set after the temperature gauge registers below 200°F (94°C).
Watch the temperature gauge regularly and turn off the unit if temperature rises above 205°F (96°C).
If shutdown is activated and temperature is normal, check the engine crankcase oil level.
If oil level is low, fill with recommended lubricating oil and restart; watch the oil pressure gauge.
If the oil level is normal, DO NOT restart the engine. Call your dealer for assistance.

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.

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: Temperature gauge shows temperature above 205°F (97°C). Fix: Shut off the engine immediately. Use the Trouble Shooting Guide on page 21 to isolate the cause of the overheat..