Cummins/Onan P218 / P220 — Out-of-Service Protection (more than 30 days)
Maintenance · Engine
For the Cummins/Onan P218 / P220, from the Cummins/Onan operator's manual.
Applies to: Cummins/Onan P218, Cummins/Onan P220
Before you start
- Gasoline preservatives (stabilizers) are toxic. Follow container label instructions, avoid skin contact, and wash hands with soap and water.
Procedure
- Run engine to normal operating temperature, shut off fuel supply and let engine run until it stops.
- If out of service more than 120 days, add a fuel preservative (OnaFresh) per container label.
- Drain oil while warm, refill with fresh oil, and attach a tag stating the oil viscosity used.
- Remove spark plugs, squirt 1 ounce (2 tablespoons or 28 grams) of rust inhibitor or SAE 30 oil into each cylinder, crank a few times, reinstall plugs.
- Perform air cleaner maintenance.
- Clean the governor linkage and wrap it with a clean cloth.
- Plug the exhaust outlet to prevent moisture, dirt and bugs from entering.
- Provide a suitable cover for the entire unit.
- If so equipped, disconnect the battery (negative cable first).
Specs & values
- 1 ounce (2 tablespoons or 28 grams) of rust inhibitor or SAE 30 oil per cylinder
Full service-parts list: Cummins/Onan P218 →, Cummins/Onan P220 →
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.