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Home›Repair guides›Cummins/Onan›Out-of-Service Protection (over 30 days)

Cummins/Onan 20W-20 — Out-of-Service Protection (over 30 days)

Maintenance · Engine

For the Cummins/Onan 20W-20, from the Cummins/Onan service manual.

Applies to: Cummins/Onan 20W-20, Cummins/Onan RDJF engine

Before you start

  • Starter cranking is too fast; oil or inhibitor fluid will fire if cranked with starter.

Procedure

  1. Run engine until thoroughly warm under at least 50 percent load.
  2. Shut down and drain oil base while warm; refill.
  3. Remove glow plugs, pour 1 ounce rust inhibitor into each cylinder, install glow plugs.
  4. Crank engine by hand only to distribute oil.
  5. Service air cleaner per Maintenance Schedule.
  6. Clean throttle and governor linkage; wrap with clean cloth.
  7. Plug exhaust outlets.
  8. Disconnect battery and follow standard storage procedure.

Full service-parts list: Cummins/Onan 20W-20 →

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.

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