Re: Coolant overflow

Posted by Owen_Dyneto On 2008/10/1 8:55:22

Thanks for all the brainstorming, guys. To answer a few of your questions, all the head gaskets installations have been done with Permatex copperized spray, I've used this stuff forever on L-head head gaskets and am a firm believer. Also, on one of the many cylinder head reinstallations, all the washers were replaced with aircraft-quality machined flat & parallel washers.

At this point the next step would appear to be the removal and reinstallation and/or replacement of the cylinder head studs with sealant, though assuming the head gasket is holding, it's difficult to see how combustion pressure is reaching the studs. I've seen coolant come up around a stud but that doesn't give a passageway to the combustion chamber if the gasket is sealing.

I've also considered a crack in the block below the exhaust valve seat, but this would give rise to coolant in the exhaust but shouldn't allow combustion pressure into the coolant because of the absence of signicant pressure in the exhaust manifold, and of course we still have a leak with the valve closed.