Hercules — Long-Term Storage

Maintenance · Engine

From a Hercules service manual — check it applies to your exact model before use.

Procedure

1. Run on unleaded gasoline at least 10 minutes.
2. Operate to normal temperature; stop engine and drain all oil.
3. Replace oil filter; refill with preservative oil MIL-L-21260.
4. Remove spark plugs; squirt a teaspoon of preservative oil into each cylinder.
5. Spray pushrods, valve stems, tappets and rocker arms with preservative oil.
6. Flush cooling system with water-soluble oil or rust inhibitor.
7. Disconnect and remove batteries; store and recharge periodically.
8. Rotate crankshaft one-half turn every two weeks.

Source: Hercules 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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