Re: Coolant overflow

Posted by Owen_Dyneto On 2008/9/30 13:43:01

Thanks for the comments thus far but nothing we haven't thought of or checked so please keep thinking about it. Of course we've changed head gaskets, each time the head was removed, probably at least 6 or 8 times by now, always a new gasket, from several sources. I've replaced Packard headgaskets probably hundreds of times so it's not like I have no experience doing it. No scratches or obvious things in the deck of the block. To repeat, so signs of any cracks in the valve seats, though we haven't removed the valves to check deep within the seats. However, if leakage occurs by pressurizing the cylinder with both valves closed, that kind of (?) eliminates that. And no coolant thrown from the exhaust that's noticeable, and we've looked! We haven't checked the block deck for flatness, but when you lay a true flat cylinder head on it w/o a gasket, it seems perfectly flat and true.

And no, the engine hasn't had any valve seats installed.

EDIT: And I should have added that we used a test kit to check for combustion byproducts in the coolant and the test was negative.