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Re: PLS. help, how to extract broken stud screw connecting exhaust manifold to the head.
Posted by Joe Dille (more from Joe Dille) on Sun, 13 May 2001 20:31:40
In Reply to: PLS. help, how to extract broken stud screw connecting exhaust manifold to the head., arik manor, Sat, 12 May 2001 09:23:58
On 12 May 01, at 12:30, arik manor wrote:

> The stud screw connecting the head to the exhaust manifold has broken.
> 1. what can cause this failure?
Stress and corrosion could cause this failure. Very little you can do about
the corrosion. The exhaust system is a corrosive neighborhood. Perhaps
some antiseize would help.

The exhaust is held on by many studs. They must all share the load. The
exhaust gasket should be in good shape and the nuts should be evenly
torqued. The manifold should also be flat.

If you want to learn more about bolts go to
http://home.jtan.com/~joe/KIAT/kiat_1.htm


> 2. what can I do to avoid happen again?
See above.

> 3. who to extract the broken stud from the head?
You could do it, or take it to any shop with a real mechanic. It is a fairly
normal procedure for a mechanic. Basically, you put some sort of
penetrating oil on it for a day or two. Then you drill a small hole in the
center and insert a special toll called an easy-out in the hole. The tool has
teeth that dig into the stud and twist it out.

The trick is to drill the hole straight and in the center. You may have to
remove the head to get access.

> 4. is broken stud screw a common failure on LPT or turbo ?
I have no idea.

Drive Safe,

Joe

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