Cummins/Onan — Preparing Units for Storage or Extended Out-of-Service Periods
Maintenance · generating plant
From a Cummins/Onan service manual covering: 10C, 10CW, 10CW-150R, 5CW, 6CW-51R, 7.5C, 7.5CW, 9CW. Check it applies to your exact model before use.
Applies to: Cummins/Onan 10CW-150R
Before you start
- Do not coat generator brushes or rings with lubricant or preservatives.
Procedure
- Shut off fuel at tank and run until it stops from lack of fuel.
- Drain oil from oil base while engine is warm and replace drain plug.
- Remove spark plugs, pour two tablespoonfuls rust inhibitor oil into each cylinder, crank slowly by hand.
- Remove, clean and replace air cleaner.
- Wipe exposed parts clean and coat with a film of grease.
- Oil governor-to-carburetor linkage with SAE 5 oil.
- Plug exhaust outlet with a wood plug.
- Clean generator brushes, holders, commutator and collector rings with a clean cloth.
Specs & values
- Two tablespoonfuls rust inhibitor oil per cylinder (SAE-50 motor oil as substitute)
Full service-parts list: Cummins/Onan 10CW-150R →
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.