head stud extractor

[dgc2]

replacing head gaskets on my '87 carrera, 90k miles. valve cover came off with one seared head bold (suprise!!!) . Shear is 1-1/2 inches down stud. after looking at the many posts, i am asking whether anyone can recommend a quality deep socket spiral 8mm extractor. irwin makes a kit, but others exist. the sheared stud is on the drivers bank, middle cylinder. there are a pair of studs adjacent to each other for the middle cylinder.

Yes I have read most of the posts on this topic and appreciate the suggestions to replace all studs. This is my wife's car, which she has driven lightly since new. My inclination is to leave it alone, since how knows when if sheared. On the other hand, if I can replace the stud, I will do so. I would add that the porsche folks replaced all cylinder heads at 46k. Apparently there was a warranty issue. Been wrenching for 60 years, and would have skipped their recommendation. Can't cry over past issues...

Thanks for any advice.

dgc2

[$yncro]

I've used Bolt extractor from local flaps.
It worked well for me with a little heat.

[blur911]

Drill it with a left-hand drill...if you can drill it. I made a tube to fit over the broken stud and put a drill down the center.
I also used square extractors, I find they work better than the spirals.

[917_Langheck]

You are going to want to use the snap on collet extractor. There is a thread here someplace where I linked to the new part number. I've seen it used in action; it's the only way to do it, even though there are other ways to do it...

[dannobee]

+1 on the Snap-On extractors.

For years I never knew what the fuss was all about regarding removing old studs, since I'd used the Snap-On extractor since day one.

[yelcab1]

Originally Posted by 917_Langheck

You are going to want to use the snap on collet extractor. There is a thread here someplace where I linked to the new part number. I've seen it used in action; it's the only way to do it, even though there are other ways to do it...

Do you mean the collet that needs the studs to be in tact with threads in order for the tool to work?

[theiceman]

i don't know how you would do all the mentioned above to remove a head stud with the engine still in the car , or are you talking about removing engine.

i would think its broken way down in their so not sure how you get that collet tool in there

[917_Langheck]

Originally Posted by yelcab1

Do you mean the collet that needs the studs to be in tact with threads in order for the tool to work?

Snap-on appears to offer both threaded and smooth bore collets (the old series was listed under CG500-x; the new series is listed under CJ500-x). I think the choice would be your preference. When we did this exercise in Tony's engine rebuilding class he had the threaded one and used it on a broken stud - missing all the threaded area. I didnt see any damage to the collet, and damage to the stud was immaterial.

If you are trying to remove the stud without pulling the cylinder off I think you're going to have to go another route, such as that posted by $yncro.

[Dpmulvan]

Originally Posted by dgc2

replacing head gaskets on my '87 carrera, 90k miles. valve cover came off with one seared head bold (suprise!!!) . Shear is 1-1/2 inches down stud. after looking at the many posts, i am asking whether anyone can recommend a quality deep socket spiral 8mm extractor. irwin makes a kit, but others exist. the sheared stud is on the drivers bank, middle cylinder. there are a pair of studs adjacent to each other for the middle cylinder.

Yes I have read most of the posts on this topic and appreciate the suggestions to replace all studs. This is my wife's car, which she has driven lightly since new. My inclination is to leave it alone, since how knows when if sheared. On the other hand, if I can replace the stud, I will do so. I would add that the porsche folks replaced all cylinder heads at 46k. Apparently there was a warranty issue. Been wrenching for 60 years, and would have skipped their recommendation. Can't cry over past issues...

Thanks for any advice.

dgc2

Snap on spirals are the only spirals I would trust. You can buy them individually off eBay et. Snap on square ones good too. Left handed drill but of course you already new that after a life of wrenching. I would stay away from Irwin or China.