Re: exhaust manifold

Posted by Paul from MI on May 29, 2007 at 18:45:25 from (66.231.36.20):

In Reply to: exhaust manifold posted by mss3020 on May 29, 2007 at 18:32:59:

Kinda bad news! Depending on if the drill bit was high speed steel(most likely) or plain carbon steel, you can try heating th e bit to a dull red and holding it for a few minutes the let cool slowly. If carbon steel, the broken bit will be softened enough to drill it out. If it"s high speed steel it probably won"t soften enough to drill it. The only sure fire way is to remove the head and take it to a machine shop that has EDM(electrical discharge machining) equipment. They can burn out the old stud and the broken bit without heat or damaging the head.
Probably a good idea to re-surface both the head and the manifold before reinstalling. I would invest in some stainless steel studs and use lots of anti-sieze on the threads. I won"t say it works perfectly, but it"s a pretty good guarantee you won"t take off that manifold ever again if you prepare for it in advance. It is Gumpermans Law or something.
Paul

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