i screwed the pooch
03-04-2006, 12:00 AM
#1
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i screwed the pooch i was installing my new dart heads and trq'n all the head bolts following all the right seq. and i broke a head bolt off in my block and it was like the very last one to do. ****...................... so i am done working on the car for tonight. wtf, i was using a trq wrench, using new gm head bolts. what gives, hell fire and damnation.
03-06-2006, 02:18 AM
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Try soaking in a ton of penetrating oil (the good stuff, not WD40) overtime to help loosen up the bolt. That worked when a headbolt broke on my 302. The only help I had was about a 1/4" of metal sticking up above the deck (which ended up being just enough for vice grips)
03-06-2006, 08:27 AM
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you stated your problem - gm head bolts - best of luck getting it out - as jswelburn stated, pull the head...don't try to work with it bolted down to the block, the bolt may actually be sticking above the deck so you can vice grip it out
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03-06-2006, 07:53 PM
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Sometimes after the bolt breaks, there is no more tension on the threads. I've used a pencil with an eraser on the end and un-screwed them that way. Worth a try.
03-07-2006, 07:14 AM
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Get a very slender pointed punch and gently tap it with a hammer on the outside edge of the remaining stud, angle the punch such that it will tend to rotate the stud in the direction of removal. You should be able to rotate it very slightly with each tap. Be sure not to damage the remaining threads in the parent material as it will make it harder to extract.
Another idea that has worked well for me is using a left handed drill bit. It turns backwards and if you can get it to grab the stud it will simply unscrew it and back it out. Only problem with this idea is a 5/16" left handed (stub) drill bit was like $30 in the late 80's/early '90's. They can also be hard to locate if you don't live in an industrial type area.
Another idea that has worked well for me is using a left handed drill bit. It turns backwards and if you can get it to grab the stud it will simply unscrew it and back it out. Only problem with this idea is a 5/16" left handed (stub) drill bit was like $30 in the late 80's/early '90's. They can also be hard to locate if you don't live in an industrial type area.
03-07-2006, 11:21 AM
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Originally Posted by oldschoolmuscle
thanks
One last trick if you use the left handed drill bit - try to center punch the remaining stud in the center if possible. It needs to be as close to center of the bolt as possible so when the drill grabs the stud it will be close enough to the center line that it unscrews out of the hole.
Too far off of center line and the physics won't allow the stud to unscrew under power. You will then be forced to use an ease out to perform the final removal by hand.