300U head gasket again

Charlie M · Jul 12, 2012

The other day I posted that my 300U was blowing water out the exhaust and pegging the temp gauge. I finally got it apart today. I've never encountered a head gasket problem before so I looking for your thoughts. There was water killing both #1 and #2 cylinders when it was running. I don't see a visible damage to head and block. Gasket had slight damage at #1 and 2 cylinder but not sure if was from removing the head or enough to leak water.Can I still have cracks that I don't see. No sealer was ever put on the gasket when the head was done in the early 90's.Do you think I should just try a new gasket or are there other suggestions.

Brownie 450 · Jul 12, 2012

Believe I'd have a machine shop magnaflux the head while you have it off. If it's good, then do the head gasket thing. If it has cracks, you can go from there.

Andrew Z · Jul 13, 2012

Agree with brownie also take the gasket with you as well they know how to read them if you will.

Andrew

Brownie 450 · Jul 13, 2012

Might not hurt to check the valves while you can do it easily.

300U head gasket again

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Charlie M

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