Specifications + Dimensions

AC Output
5 Kw60 Hz @ 1800 rpm
240 V/20.8A, 120 V/41.6 A
4.5 Kw50 Hz @ 1500 rpm
220 V/20.5 A
Voltage Regulation+/- 5%
Cylinders:3 inline
(Based on SAE J1995 and ISO 3046)
Engine Data
TypeVertical inline
3 cylinder diesel
Displacement:46.4 in3
(0.76 ltr)
Bore/Stroke:2.6/2.83 in
(67/72 mm)
HP @ RPM10.1/1800
Approximate fuel use:
1800 RPM @ full load0.59 gph
(2.2 lph)
1800 RPM @ half load0.32 gph
(1.2 lph)
1500 RPM @ full load0.50 gph
(1.9 lph)
1500 RPM @ half load0.28 gph
(1.1 lph)
(Actual fuel consumption will vary depending on operating conditions.)
Installation Data
Wet exhaust elbow1.5 inch
(38 mm) OD
Raw water inlet3/4 in
(19 mm) OD
Fuel inlet and return1/4 inch NPT

NOTICE:  Northern Lights generator sets and /or any other diesel powered equipment provided by NLI is not provided with spark arresting or explosion proof components, and therefore is not to be installed in the presence of combustible gasses having a flash point of 43.3 Degrees C (110 Degrees F) or lower, such as Gasoline, Propane, Natural Gas or other similar fuel sources.


Information and dimensions are subject to change without notice.

Consult factory for classification society.

Features + Benefits

Four cycle, 3 cylinder, liquid cooled, naturally aspirated, overhead valve diesel with glow plugs for quick starting. Swirl combustion chambers improve fuel efficiency and reduce smoke.

Standard heat exchanger cooling with optional keel cooling. Copper-nickel, tubetype heat exchanger has removable rubber end caps for easy cleaning, and no need for zincs. The bronze and stainless steel seawater pump with rubber impeller is gear driven, eliminating a potential failure point.

The self-venting fuel system features an inline injection pump with 3-5% mechanical governor for close AC frequency control. Stop solenoid acts directly on the fuel rack eliminating external linkage problems. The fuel lift pump is mechanical with a hand primer, eliminating electronic pump failures. Flexible fuel lines plumbed to base pan as standard.

The M673LD3G meets US EPA Tier III emission standards. Its cast aluminum intake manifold with Sound Maze system reduces noise, and its washable air cleaner makes routine maintenance simple. The wet exhaust elbow is stainless steel.

The closed crankcase vent system traps oil vapor and keeps engine room clean. 3.1 qt (3 ltr) oil capacity for better lubrication and 200 hour oil change intervals. Oil drain hose allows for ease of maintenance.

The DC System features a 12 volt starter motor and battery charging alternator with belt guard. The set is equipped with a standard remote mount control panel, featuring an hour meter, stop-start switch with run light and a preheat switch, and includes a 20 foot (6m) harness. The standard panel can be expanded to six panels, up to 110 feet from the set. Low oil pressure, high coolant temperature and high exhaust temperature safety shutdowns are standard.

The Northern Lights, direct coupled, four pole, four lead generator has Class “H” insulation, a pre-lubricated bearing and features a conservative heat rise rating of 95°C/50°C ambient. Our automatic voltage regulator gives you ±5% voltage regulation. The AVR protected by a dedicated circuit breaker.

© Northern Lights, Inc. 2018