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Helicoil exhaust stud thread with manifold on block? 700 1989

posted by  Sanfam on  Wed Mar 8 18:29 CST 2006
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last visit: Mon Apr 12 05:40 CST 2010
[RELATED]

So after disassembling the exhaust manifold on my shiny new turbo 740 wagon, re-assembling it, and then getting it going...I discovered something truly horrible: one of my manifold studs was fudged. it was just plain not sticking to its happy little hole and slid right out after being torqued down.

Now, I just don't have the time to take everything apart again, and I do not think it is in my best interest to drive the car to a shop with a leaking manifold gasket (it'll burn right through and leave me with another shot gasket needing replacement, right?)...

so my question is...is it possible to install a helicoil into the head with the manifold still attached by the remaining seven studs and nuts?

Am I...nuts...for asking? *rimshot* *tomato to the face*

I'm rather desperate right now and need this car working on a timely basis, and I just do not have the capacity to disassemble it again to tap it for a larger stud.

Though, if I find the time to do it and decide to get it tapped for an M10-1.25 stud, where would one go about buying a stud of said size that would not become weak under high heats, such as those created by the turbo?


Edit: I guess the question is asking is not whether or not it's possible to install a helicoil in the head, but if the exhaust manifold hole is large enough to allow it? I was just thinking, though, that one only needs a tiny bit of grinding to enlarge it fairly well, so I suspect that it's probably nothing too difficult, actually.
--
1984 240 DL, 1987 740 GLE, 1989 740 Turbo Intercooler, 1990 740 GL, 1993 850 GLT






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