HomeEnginesCummins/Onan E125V

Cummins/Onan E125V Engine Engine

The Cummins/Onan E125V is a 0.39 L 1-cylinder engine rated at 3600 rpm, producing up to 9.3 kW. It powers generator sets from Cummins/Onan, including the EW25W.

Also known as: Onan E125V

0.389 L
Displacement
1
Cylinders
3600 rpm
Rated speed
9 kW
Gross power

Engine specifications

Displacement0.389 L
Cylinders1
Rated speed3600 rpm
Gross power9 kW

Generator sets powered by this engine

1
Cummins/Onan EW25W

Maintenance schedule

ItemSpecCapacityPart #Interval
Air filterElement Wrapper (If Equipped)140-233525 hr PartsGeek
Fuel filterFuel Filter149-2206-0125 hr PartsGeek
Oil filterSpin off oil filter element and discard it. Thoroughly clean filter mounting surface and make sure new gasket is inserted in the element. Apply a thin film of oil to the gasket. Spin element down by hand until gasket just touches mounting pad and then turn down an additional 1/2-3/4 turn. Do not overtighten.122-073725 hr PartsGeek FridayParts $42.99
OilRun engine until thoroughly warm before draining oil. Stop the engine, place a pan under the drain outlet and remove the oil drain plug. After the oil is completely drained, replace the drain plug. Refill with oil of the correct API classification and appropriate SAE viscosity grade for the temperature conditions (refer to ENGINE SET-UP).

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 displacement of the Cummins/Onan E125V?

The Cummins/Onan E125V has a displacement of 0.389 liters with 1 cylinders.

Which generators use the Cummins/Onan E125V engine?

The Cummins/Onan E125V powers 1 generator set(s), including Cummins/Onan EW25W.