Northern Lights ML673L3.3 6KW Marine Diesel

FOR SALE Northern Lights ML673L3.3 6KW Marine Diesel Generator. optimized for sailboats, small-to-mid-sized yachts, and commercial vessels.

The diesel engine ingested water at 220+ hours. It was taken apart, machined and rebuilt with new pistons & rings, new cylinder head and new coolant pump. it was test run, produces proper power. can be set up for 120v or 120/240v at 60hz. comes with 19ft extension harness, control panel and sound enclosure. please ask questions if you have any doubts.

Technical Specifications

• Power Output : 6 kW at 60 Hz (1800 RPM) / 5 kW at 50 Hz (1500 RPM).
• Engine Config : 4-cycle, 3 cylinders, inline long-stroke diesel.
• Aspiration : Naturally aspirated with swirl combustion chambers for lower emissions.
• Physical Dimensions : 27.5” Length × 16.7” Width × 20.5” Height.
• Dry Weight : 371 lbs. (168 kg)
• Emission Standards : US EPA Tier III compliant

Engine & Cooling Design

• Heat Exchanger : Standard freshwater cooling via a cupro-nickel tube-type heat exchanger. It features removable rubber end caps for easy cleaning without requiring sacrificial zinc anodes.
• Exhaust Manifold : Cast iron, liquid-cooled exhaust manifold. This unified structure eliminates multiple hoses and failure-prone gaskets.
• Seawater Pump : Gear-driven bronze and stainless steel pump with a rubber impeller. This design removes the risk of traditional belt failures.

Electrical & Fuel Features

• AC Generator : Direct-coupled, four-pole, four-lead reconnectable generator utilizing Class “H” insulation and a conservative 95°C heat rise rating.
• Fuel System : Self-venting system equipped with an inline injection pump and a 3–5% mechanical governor for robust frequency control.
• Safety Features : Automatic emergency safety shutdown triggers for low oil pressure, high coolant temperature, and high exhaust temperatures.