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Home›Repair guides›Cummins/Onan›Protection for Extended Out-of-Service Period (more than 30 days)

Cummins/Onan — Protection for Extended Out-of-Service Period (more than 30 days)

Maintenance · Complete engine

From a Cummins/Onan service manual — check it applies to your exact model before use.

Applies to: Cummins/Onan NHP / NHPV engine

Before you start

  • Discharged batteries are subject to severe damage if exposed to freezing temperatures.

Procedure

  1. Run engine until thoroughly warmed up.
  2. Turn off fuel supply and run until engine stops from lack of fuel.
  3. Drain oil from oil base while still warm; attach warning tag to refill.
  4. Remove each spark plug; pour one ounce of rust inhibitor or SAE #50 oil into cylinder.
  5. Crank engine over a few times; reinstall each spark plug.
  6. Service air cleaner per maintenance schedule.
  7. Lubricate governor linkage; wrap with clean cloth.
  8. Plug exhaust outlet and cover unit; disconnect battery and follow battery storage procedure.

Specs & values

  • One ounce (two tablespoons) rust inhibitor or SAE #50 oil per cylinder

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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