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Cummins/Onan 6AC71 Engine

The Cummins/Onan 6AC71 is a 0.98 L 2-cylinder air cooled engine rated at 1800 rpm. It powers generator sets from Cummins/Onan, including the NH 940-501. It holds 4 L (1.1 gal) of oil.

Also known as: ONAN 6AC71

0.9835 L
Displacement
2
Cylinders
1800 rpm
Rated speed
4.0 L
Oil capacity

Engine specifications

Oil capacity4.0 L
Displacement0.9835 L
Cylinders2
AspirationAir Cooled
Rated speed1800 rpm

Generator sets powered by this engine

1
Cummins/Onan NH 940-501

How to read your Cummins/Onan engine serial & model number →

Maintenance schedule

ItemSpecCapacityPart #Interval
Air filter
Fuel filter
Oil filter200 hr
Battery
Belt
Coolant
Coolant filter
Oil
Spark plug

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 6AC71?

The Cummins/Onan 6AC71 engine has an oil capacity of 4.0 liters.

What is the displacement of the Cummins/Onan 6AC71?

The Cummins/Onan 6AC71 has a displacement of 0.9835 liters with 2 cylinders.

Which generators use the Cummins/Onan 6AC71 engine?

The Cummins/Onan 6AC71 powers 1 generator set(s), including Cummins/Onan NH 940-501.