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B230FT Cylinder Head Oil Leak 900

posted by  Townshend Act on  Mon Mar 8 20:52 CST 2021
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last visit: Tue Oct 7 22:44 CST 2014
[RELATED]

Hi Everyone,

I'm trying to correct an engine oil seepage coming from the small Allen head plug at the rear of the cylinder head, under the distributor housing. The plug is used to close off the oil galley servicing passage at the rear of the cylinder head.

I put UV Dye in the engine oil and properly pinpointed the source of the leak, so there is no question there. It is NOT the valve cover gasket or distributor housing o-rings.

The Allen head plug and cylinder head threads appear in good condition (not stripped or cross-threaded), but every sealant I've used has failed.

Question: What can I use to seal this oil galley plug to end the leaking?

I've tried Permatex RTV, Three-Bond, Epoxy, JB Weld, and the last time I used RectorSeal 5.

I'm now seriously considering cylinder head removal and having the machine shop weld it closed.

The engine has been rebuilt recently and runs tip-top. It just drips that small amount of oil.

Any help appreciated as always!






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