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Cummins/Onan 5.5 NH Engine Engine

The Cummins/Onan 5.5 NH is a 60 L 2-cylinder natural engine rated at 1800 rpm, producing up to 5.5 kW. It powers generator sets from Cummins/Onan, including the 14RCA/L. It holds 4 L (1.1 gal) of oil.

Also known as: Onan 5.5 NH

60.0 L
Displacement
2
Cylinders
1800 rpm
Rated speed
5 kW
Gross power

Engine specifications

Oil capacity4.0 L
Displacement60.0 L
Cylinders2
AspirationNatural
Rated speed1800 rpm
Gross power5 kW

Generator sets powered by this engine

1
Cummins/Onan 14RCA/L

Common problems

3
  • If the engine fails to start at first try
    Cause: Inhibitor oil used at the factory may have fouled the spark plugs
    Fix: Remove the plugs, clean in a suitable solvent, dry thoroughly and install
  • Heavy exhaust smoke when the engirie is first started
    Cause: Caused by the inhibitor oil
  • Continuous generator overloading may cause high operating temperatures that can damage the windings
    Fix: Keep the load within the nameplate rating

Compiled from service & troubleshooting documentation across every generator set that uses the Cummins/Onan 5.5 NH.

Maintenance schedule

ItemSpecCapacityPart #Interval
Air filterAir cleaner element—100 hr find
Fuel filterFuel filter—100 hr find
Oil filterCrankcase oil filter—200 hr find
BeltSAE Group 60—25 hr find
OilCrankcase oil4.0 U.S. quarts—50 hr

Pooled from every document that names this exact engine — confirm the interval and part number against your unit's serial number.

Common questions

What is the oil capacity of the Cummins/Onan 5.5 NH?

The Cummins/Onan 5.5 NH engine has an oil capacity of 4.0 liters.

What is the displacement of the Cummins/Onan 5.5 NH?

The Cummins/Onan 5.5 NH has a displacement of 60.0 liters with 2 cylinders.

Which generators use the Cummins/Onan 5.5 NH engine?

The Cummins/Onan 5.5 NH powers 1 generator set(s), including Cummins/Onan 14RCA/L.

How often should you change the oil in the Cummins/Onan 5.5 NH?

The Cummins/Onan 5.5 NH oil change interval is every 50 hours.

What is a common problem with the Cummins/Onan 5.5 NH engine?

A commonly reported issue on generators using the Cummins/Onan 5.5 NH is: If the engine fails to start at first try. Cause: Inhibitor oil used at the factory may have fouled the spark plugs. Fix: Remove the plugs, clean in a suitable solvent, dry thoroughly and install.