Facts About Generators
GeneratorsDirectoryCompareRepairEnginesControllersPartsManufacturersGuides
Search models or part #
Home›Engines›Cummins/Onan Standard

Cummins/Onan Standard Engine Engine

The Cummins/Onan Standard is a not specified engine. It powers generator sets from Cummins/Onan, including the 14RCA/L and 20RCA/L. It holds 4.5 L (1.2 gal) of oil and 10 L (2.6 gal) of coolant.

Also known as: Onan Standard

4.5 L
Oil capacity

Engine specifications

Oil capacity4.5 L
Coolant capacity10.0 L
AspirationNot specified

Generator sets powered by this engine

2
Cummins/Onan 14RCA/LCummins/Onan 20RCA/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 Standard.

Maintenance schedule

ItemSpecCapacityPart #Interval
Air filter503-0821503-0821 buy
Fuel filter502-0054502-0054 eBay
Oil filter503-0597503-0597 eBay
Belt503-0465503-0465 eBay
Coolant filter505-0017505-0017 eBay

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 Standard?

The Cummins/Onan Standard engine has an oil capacity of 4.5 liters.

Which generators use the Cummins/Onan Standard engine?

The Cummins/Onan Standard powers 2 generator set(s), including Cummins/Onan 14RCA/L, Cummins/Onan 20RCA/L.

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

A commonly reported issue on generators using the Cummins/Onan Standard 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.