Cummins/Onan N52M — Out-Of-Service Protection
Maintenance · Engine
For the Cummins/Onan N52M, from the Cummins/Onan service manual.
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Procedure
- Run engine until normal operating temperature.
- Turn off fuel supply and run engine until it stops.
- Drain oil from warm engine.
- Refill crankcase with fresh oil; attach tag indicating viscosity used.
- Remove spark plugs; place rust inhibitor oil in cylinders; rotate crankshaft a few times; reinstall spark plugs.
- Service air cleaner.
- Clean governor linkage.
- Plug exhaust outlet and fuel inlet fittings.
- Wipe off entire unit; coat rustable parts with light film of oil/grease.
- Remove battery; store separately following standard battery storage procedures.
- Provide entire unit with a porous cover such as canvas. Do not use plastic.
Source: Cummins/Onan service manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.