NL673L4: 5/4.5 kW


Engine Block
• Four cycle, 3 cylinder, liquid cooled, naturally aspirated, overhead valve, industrial-duty diesel.
• Swirl combustion design improves fuel efficiency, reduces smoke and noise.
• Glow plugs for fast cold weather starting.
Cooling System
• Liquid-cooled with radiator and pusher cooling fan. Steel radiator shroud and fan guard protects the radiator and operator.
Self-Venting Electrical Fuel System
• Electrical fuel system for safe, economical function.
• Bosch-type in-line injection pump.
• Stop solenoid controls the fuel rack, not throttle, to eliminate speed variance and linkage problems.
• Engine speed governed to 5% for close AC frequency control.
• Pintle fuel injectors have replaceable tips for lower service costs.

• Mechanical fuel pump with hand primer.
• Large spin-on fuel fliter.
• Steel fuel lines.
Lubrication System
• Pressure lubricated. Trochoid oil pump.
• Full flow, spin-on oil filter with bypass.
• 3.1 qt. (3 ltr) oil capacity.
Intake and Exhaust
• Large replaceable air filter protects engine in dusty environments.
• Residential muffler built into the exhaust manifold simplifies installation.
• Meets US EPA Tier IV exhaust emission requirements for cleaner air.
DC Electrical System
• 12 volt system includes starter motor, battery charging alternator with solid state voltage regulator and DC circuit breaker.
• Standard, unit mount S-1B control panel has engine hour meter, start-stop switch with run light and preheat switch.
• Dual panel relays and quick disconnect harness plug-ins. With optional Y-harness and 10, 20 or 40 foot wire harness extensions, you can have up to six remote control panels up to 100 feet from the generator set.
• Safety shutdown system for low oil pressure and high coolant temperature.

AC Generator
Northern Lights, direct coupled, 4 pole, revolving field, 4 lead reconnectable generator with Class H insulation and prelubricated bearing. Conservative heat rise rating: 95°C/50°C ambient. Compare this to light duty sets with heat rise ratings of 130°C or higher.
• External automatic voltage regulator gives you ±5% voltage regulation. AVR powered by dedicated AC winding for improved motor starting. AVR circuit breaker.
• 30 amp mainline circuit breaker protects generator from AC overloads and shorts.
• High air flow from integral fan keeps generator running cool.
Special Equipment
• Welded steel skid frame gives rigid support and makes installation easy.
• Enhanced fan guard for improved operator safety.
• Flexible mounts isolate engine vibration for smooth operation.
• Long life, blue enamel paint finish.
• Operator’s and parts manuals.
• Rigorous quality control includes a test run with load.
• Export grade shipping crate protects set.


NL673L4 Specifications
60 Hz / 1800 rpm:5 kW
50 Hz / 1500 rpm:4.5 kW
Cylinders:3 inline
Bore:2.6 in (67 mm)
Stroke:2.8 in (72 mm)
Displacement:46 cid (0.76 ltr)
Fuel Systems:Electronic
Length:32.8 in (834 mm)
Width:17.1 in (435 mm)
Height:26.8 in (650 mm)
Weight:390 lbs (178 kg)
Information, specifications, materials and dimensions subject to change without notice.
US EPA Tier 3 Certified Units are available globally.

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