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Cummins/Onan Quiet Diesel Engine

The Cummins/Onan Quiet Diesel is an engine rated at 2400 rpm. It powers generator sets from Cummins/Onan, including the Quiet Diesel 12500, Quiet Diesel 5500 and Quiet Diesel 7500.

Also known as: Onan Quiet Diesel

2400 rpm

Rated speed

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Engine specifications

Rated speed	2400 rpm

Generator sets powered by this engine

Cummins/Onan Quiet Diesel 12500Cummins/Onan Quiet Diesel 5500Cummins/Onan Quiet Diesel 7500

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

Common problems

Unit runs then surges
Cause: Loose or worn spark plug leads
Fix: Check spark plug leads at spark plug & ignition coil
Unit starts and runs, then stops when the start switch is released
Cause: Low fluid levels
Fix: Check & bring all fluids up to the appropriate levels
Circuit breaker trips
Cause: Overloaded circuit
Fix: Turn-off some of the electrical load, and reset the circuit breaker

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

Common questions

Which generators use the Cummins/Onan Quiet Diesel engine?

The Cummins/Onan Quiet Diesel powers 3 generator set(s), including Cummins/Onan Quiet Diesel 12500, Cummins/Onan Quiet Diesel 5500, Cummins/Onan Quiet Diesel 7500.

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

A commonly reported issue on generators using the Cummins/Onan Quiet Diesel is: Unit runs then surges. Cause: Loose or worn spark plug leads. Fix: Check spark plug leads at spark plug & ignition coil.