HELP!! Broken bolt in head - Exhaust manifold
Printed From: CorrectCraftFan.com
Category: Repairs and Maintenance
Forum Name: Engine Repair
Forum Discription: Engine problems and solutions
URL: http://www.CorrectCraftFan.com/forum/forum_posts.asp?TID=33835
Printed Date: October-08-2024 at 1:19pm
Topic: HELP!! Broken bolt in head - Exhaust manifold
Posted By: kman
Subject: HELP!! Broken bolt in head - Exhaust manifold
Date Posted: June-11-2014 at 1:50am
7 out of 8 ain't bad unless number 8 is broken off in the head and then the easy out breaks off in the bolt... Imagine a grown man crying now. I have gone through all the bits at home depot, lowes, Fastenal & Northern Tool. I have a divet in the bolt and all the bits I buy just spin with NO bite. I got a left handed bit to bite for about 2 turns and then nothing. Please help!! Is there a magic drill bit somewhere? I'm drilling slow with lubrication. Been two weeks of off and on trying as I watch June coast on by... ------------- Kirk 1976 Southwind 20 Eagle Mountain Lake Fort Worth |
Replies:
Posted By: JoeinNY
Date Posted: June-11-2014 at 2:23am
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7 will get the job done - if you cant live with that dremel in a slot and use an impact driven screwdriver. But seriously 7 will work... ------------- http://www.correctcraftfan.com/diaries/details.asp?ID=1477 - 1983 Ski Nautique 2001 1967 Mustang 302 "Decoy" http://www.youtube.com/watch?v=cO5MkcBXBBs - Holeshot Video |
Posted By: TRBenj
Date Posted: June-11-2014 at 8:24am
| Yeah, what joe said. Some aftermarket manifolds only use 1 bolt per cylinder. |
Posted By: baitkiller
Date Posted: June-11-2014 at 9:05am
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Got a welder? weld a nut on it. ------------- Jesus was a bare-footer............. |
Posted By: GottaSki
Date Posted: June-11-2014 at 11:05am
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Another ditto what Joe sez Next time skip the easy out, and go straight to the left handed bits. ------------- "There is nothing, absolutely nothing, half so much worthwhile as messing around with boats...simply messing." River Rat to Mole |
Posted By: mamigacz
Date Posted: June-11-2014 at 3:15pm
I've had success with this. Plus getting the head cherry red around the bolt with an acetylene torch before removing the bolt. Its possible that an oxy-MAPP torch might work too. |
baitkiller wrote:Posted By: JoeinNY
Date Posted: June-11-2014 at 3:34pm
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Ive got a welder, but I am only a hack... I would weld in this scenario only as a last resort, and then only over the winter after I had skied all year on 7 bolts... If it is a pcm engine then it was likely a hardened bolt and to get something welded to it with a chance of success would require enough heat that I might just weld that stud to the head then I would be cutting it off of a surface I want to be as flat as possible so I can seal against it with only one bolt. ------------- http://www.correctcraftfan.com/diaries/details.asp?ID=1477 - 1983 Ski Nautique 2001 1967 Mustang 302 "Decoy" http://www.youtube.com/watch?v=cO5MkcBXBBs - Holeshot Video |
Posted By: backfoot100
Date Posted: June-11-2014 at 3:52pm
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Another option is remove the head and find a shop that has an EDM extractor. They work wonders but not a lot of shops have them. Definitely need to call around first. Unfortunately, removing/replacing the head is much more time consuming. ------------- When people run down to the lake to see what's making that noise, you've succeeded. Eddie |
Posted By: 8122pbrainard
Date Posted: June-11-2014 at 9:43pm
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You have work hardened an already hard bolt from bits skidding on the metal and not cutting. Carbide drill bit but be careful as they are brittle and with a hand drill you need to be very steady. If that and a easy out doesn't work then I agree with Eddie's suggestion of using an EDM. A very aggressive cutting angle on the bit is needed since with a hand drill you can't get much pressure on the bit. The only bad side to this is having to sharpen it frequently. Do you have a bench grinder? Also did you start off with a small diameter pilot hole. I can't tell from the picture. With a hand drill and the lack of pressure you can apply, with starting with a small diameter bit, you can apply more pressure at the bit. Then increase the bit size a couple times. What type of extractor are you using? I hate the tapered spiral ones. They will actually expand the bolt tightening it in it's threads. I like the spline type. ------------- /diaries/details.asp?ID=1622" rel="nofollow - 54 Atom /diaries/details.asp?ID=2179" rel="nofollow - 77 Tique 64 X55 Dunphy Keep it original, Pete < |