Cummins/Onan — Storing the Plant for an Indefinite Period
Maintenance · Complete plant
From a Cummins/Onan owner's manual — check it applies to your exact model before use.
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Before you start
- Do not coat generator brushes, commutator or collector rings with lubricant or preservative.
Procedure
- Drain crankcase completely and refill with M 4834 A Engine Preservative Oil (SAE 10); attach a warning tag.
- Run until completely out of gasoline, then restart and run on M 534 H unleaded undyed gasoline at least 10 minutes.
- While running, spray M 4834 A into the carburetor air intake for about two minutes.
- Open the throttle briefly, shut off ignition, and continue spraying until the engine stops.
- Drain the oil and gasoline; drain water at radiator bottom and rear of cylinder block.
- Remove each spark plug and pour two tablespoonfuls of rust inhibitor oil into each cylinder; crank the engine.
- Seal all openings in the engine and accessories with M 6471 non-hydroscopic adhesive tape.
- Spray all taped openings, accessories and exterior engine surfaces with M 4858 B Insulation Compound-Ignition.
Source: Cummins/Onan owner'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.