Specifications + Dimensions

40 kW60 Hz,
1800 RPM
Voltage/Amperage120-208V /
139 A
Phase/power factorStd: 3/0.8
(Opt. 1/1.0)
Voltage regulation±1%
(Based on SAE J1995 and ISO 3046.)
TypeVertical inline
4 cylinder diesel
Displacement202 in3 (3.3 ltr)
Bore/Stroke3.7/4.7 in
(94/120 mm)
HP @ RPM60 @1800
Approx. fuel use
1800 RPM @
full load2
3.4 gph
(12.9 lph)
1800 RPM @
half load2
1.8 gph
(6.8 lph)
Actual fuel consumption will vary depending on operating conditions
Dry exhaust outlet3 inch
(76 mm) OD
KC raw water inlet0.75 in
(19 mm) OD
KC coolant inlet
/ outlet
1.65 x 1.5
inch OD
Fuel inlet
and return
0.25 inch
NPT female
Length59.8 in
(1519 mm)
Width25.8 in
(655 mm)
Height41.0 in
(1041 mm)
Approximate dry weight1500 lbs
(680 kg)

Features + Benefits

Four cycle, 4 cylinder, liquid cooled, dry turbocharged overhead valve diesel. The induction hardened, forged carbon steel crankshaft is stronger than cast iron while the cross flow head makes for more efficient breathing. Helical cut and ground, carbon steel timing and PTO gears reduce noise.

Standard keel cooling. Cast aluminum expansion tank with coolant recovery type filler cap. Thermostat for quick warm up and safety. Cast iron exhaust manifold has two pass jacket-water flow for even temperature control.

Easy to service mechanical, direct injection fuel system. Spin on fuel filters with air bleed. Mechanical fuel transfer pump with manual priming plunger.

The M40C3F is fully compliant with US EPA Tier III emission standards. Its dry air filter silences intake noise

Full flow, spin-on oil filter with bypass. 10.5 qt (10 ltr) center well oil pan. Closed crankshaft vent system keeps oil vapor inside engine for clean engine room.

The DC System uses reliable relays instead of unrepairable printed circuit boards. 12 volt system includes circuit breaker, starter motor and alternator with integral regulator.

Standard flush mount S-3C control panel has hour meter, oil pressure gauge, coolant temperature gauge, DC voltmeter, stop-start switch and preheat switch. Expandable up to six panels, up to 110 feet from the set. Low oil pressure and high coolant temperature shutdowns are standard.

The Northern Lights, direct coupled, four pole, revolving field, twelve lead reconnectable generator has Class “H” insulation and a pre-lubricated bearing and features a conservative heat rise rating of 95oC/50oC ambient. Engines and generators are torsionally matched for long life. Automatic Voltage Regulator (AVR) gives quick +/-1% RMS no load to full load voltage regulation. AVR has circuit breaker protection.

Northern Lights Commercial Series gensets are made for the demands of the marine environment, with features including a rugged, welded steel base frame, captive vibration isolation mounts and a belt guard for operator protection.

Match your generator set to your job requirements. Optional equipment includes front power take-off (PTO) with 12 or 24V electric clutch and SAE B spline providing up to 58 HP. Heat exchange cooling is available with 3 inch wet exhaust. Add a dry muffler with 18” SS flex. Alarms are shutdowns can be installed for low oil level, raw water flow and overspeed.