6 replies to this topic

[Loose_Moose]

I broke an exhaust manifold stud the other day. I think that it must have already been compromised somehow because it twisted off with almost no effort whatsoever. It is, of course, broken off within the head so there is no way to get a hold of it. I have read all the horror stories and the not so horrible stories about using an extractor. What is everyones take on using an extractor to back the remaining part of the stud out? I can get to the stud fairly easily to drill it out with a nuematic drill (like a small Dremel) so that I can dril a hole for the extractor. The other 7 studs all came out pretty easy, so I don't think there is much seizing going on.

Everyone's thoughts and advice would be much appreciated.

Loose Moose

[blackknight]

A good penetrating oil would be an order before attempting o remove it with the extractor. I use pb blaster and have had good results with it over the years.

[Loose_Moose]

A good penetrating oil would be an order before attempting o remove it with the extractor. I use pb blaster and have had good results with it over the years.

PB Blaster is an absolute must and I applied it to all of the bolts and studs before removal. Thats why I think that the stud must have been previously compromised since all of the other manifold bolts and studs came off so easily.

The screw extractor that I purchased is a Black & Decker 7/64th inch. After further investigation, I think that I should go up one or two sizes. I uploaded a pic of the extractor. If there is something that would work better, please let me know.

Attached Files

•  Extractor1.jpg   4.01K   3 downloads

[blackknight]

I prefer the extracters that are of the square variety but the ones you have will do fine.

[swiftjustice44]

I've never had much luck w/ extractors. If the stud is in tight, forcing the extractor in just expands the stud. Or that's how it felt. I just use a series of drill bits until I'm nearly to the diameter of the hole. then I use an extractor to get the last bits.

[Chris_R]

I had one snap off in the head of my 745 Turbo. I just wire-tied the gasket to the exhaust manifold on that side and let it go.
It'll stay that way til the next time the head gasket blows, then I'll get it fixed.

No leaks either.

[Three Fat Tigers]

You might want to use a centering guide bushing for the drill bit, this will help you drill the pilot hole accurately centered which can prove critical.

Make sure the replacement stud is made from hardened steel, should make an high pitched ping sound when you drop it on the ground, normal studs do not.