12.20. Repair a leaking crankcase

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Grease the main casting surface. Clean the cover surface with acetone and butter it with aluminum-filled epoxy. Bolt the two castings together and allow the epoxy to set up. When you pull the cover off the one should match the other and seal with a paper gasket. The only other way is to strip the castings bare and take them to a machine shop to have the gasket surfaces fly-cut on a vertical mill but that ain't gonna be cheap.

Fred Hill, S'toon.


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