Posted by ObsoElitist on February 24, 2015 at 23:04:07 from (67.181.86.31):
In Reply to: head gaskets posted by Nick167 on February 23, 2015 at 18:01:05:
I have heard of very few successful re-uses of a head gasket. Solid copper gaskets can be annealed, but that doesn't make them or composite gaskets thicker where they were compressed. Aside from changing the profile of a gasket, it also imprints whatever machine marks are in the parts, good luck getting them exactly back in the grooves. The only reason I would re-use a head hasket is to run from a zombie horde. Sandy Olson's Gaskets can make anything you need, if there are no other sources. As to sealers, most modern gaskets need no sealer, "copper coat" is just goo with a little copper in it, and Hylomar is the best for gasoline exposure but it's just grease under a headgasket.
I did some research on the paint myth and tracked it down. It does works on the old stuff if you do it right.
All threads should be chased and oiled before torquing, it makes a big difference, and I usually torque head studs before removal to see if they need repair.
Use a high quality silver metallic high-temp engine enamel, not spray can fake paint. I use Bill Hirsh brand, it has so much powdered aluminum it is heavy and you can see it when you stir. The powdered metal is the most important ingredient. Using a disposable sponge brush, coat both sides, hang it from a wire and brush out the runs. Just when it gets to the point where it is still tacky but won't leave paint on your finger, do another coat. When that reaches the same tack, install the gasket and torque in order and in stages. Re-torque in 4 hours, and wait overnight to warm up the engine and re-torque again. It has done the job for me on some 20's and 30's straight and V-8 engines that had a history of blowing head gaskets.
This post was edited by ObsoElitist at 23:07:10 02/24/15 2 times.
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