Quote:
Originally Posted by DBG
So i just replaced my head gasket on my '78 Mercruiser 470. Noticed the old one looked undamaged. Now that the new one is installed, the engine is still leaking around the head gasket and runnin hot. I think either the head or block might be warped. Anyone know whether either is a common problem? And does anybody out there have anything to say about the pour-in sealers aka Blue Devil, Steel Seal, etc? Any opinions are welcome and appreciated... Thanks!
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Pull the head, take it to a machine shop and have them check it. They can either fly cut it if it's aluminum or surface grind it if it's cast iron... If it's really warped then it's time for a new head. When you reinstall the head, ignore the recommended torque pattern and start tightening the bolts where the warp was first, then work out to the ends. I doubt very seriously that the block is warped.. it takes a LOT of heat to warp a cast iron block. I'm not a fan of sealers, because I always worry about them clogging the engine, but I've seen them seal freeze out plugs and small cracks, so they do work. If you go that route I'd recommend K-Seal made by Solv-Tec. It's used in industrial applications, Trucks, Tractors, AG, RV and Larger capicity engines. Seems to work good... We've used it on a few of our Cat Excavators with great results.
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1987 V20 w/1987 150HP Yamaha on a Shoreland'r Trailer
1978 16.5 Airslot w/1996 120HP Force on a Four Winns trailer
1996 V21 w/1993 200HP Mercury on a Shoreline Trailer
All towed by a 5.7L Hemi Durango.
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