Onan Oil Burning / Internal Engine Wear

Generator emits blue smoke from exhaust, especially under load

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

Possible Causes

Worn piston rings, Worn valve guides or seals, Overfilled crankcase oil, Turbocharger oil seal leak (if equipped)

Safety first: Avoid prolonged operation if oil consumption is high. Monitor oil level closely.

Check oil level: Ensure oil is not overfilled. Drain to correct level if necessary.
Monitor consumption: Track oil usage over several hours of operation. Excessive consumption indicates internal wear.
Inspect breather system: Check crankcase breather for blockage that could force oil into intake.
Professional diagnosis: Blue smoke typically requires engine teardown or major repair. Contact an authorized Onan service provider.

Professional Required 5/5

Piston Ring Set

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