Cummins/Onan B43 / B48 — Out-of-Service Protection (more than 30 days)

Maintenance · Engine

For the Cummins/Onan B43 / B48, from the Cummins/Onan operator's manual.

Applies to: Cummins/Onan B48

Procedure

1. Run the engine until it reaches normal operating temperature.
2. Turn off the fuel supply and run the engine until it stops.
3. Drain oil from oil base while warm; refill with fresh crankcase oil and attach a tag stating viscosity used.
4. Remove spark plugs; pour 1 ounce (2 tablespoons or 28 grams) of rust inhibitor or SAE #50 oil into the cylinders, crank a few times, reinstall plugs.
5. Service air cleaner as outlined in Maintenance.
6. Clean governor linkage and protect by wrapping with a clean cloth.
7. Plug exhaust outlet to prevent entrance of moisture, dirt, bugs.
8. Wipe entire unit; coat rustable parts with a light film of grease or oil.
9. Provide a suitable cover for the entire unit.
10. If battery equipped, disconnect and follow standard battery storage procedure.

Full service-parts list: Cummins/Onan B48 →

Source: Cummins/Onan operator's 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.

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