HELP!! Broken bolt in head - Exhaust manifold |
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8122pbrainard
Grand Poobah Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41045 |
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Posted: June-11-2014 at 9:43pm |
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.
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backfoot100
Platinum Member Joined: January-03-2007 Location: United States Status: Offline Points: 1897 |
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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. |
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When people run down to the lake to see what's making that noise, you've succeeded.
Eddie |
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JoeinNY
Grand Poobah Joined: October-19-2005 Location: United States Status: Offline Points: 5698 |
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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.
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mamigacz
Groupie Joined: June-08-2014 Location: Wisconsin Status: Offline Points: 96 |
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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. |
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GottaSki
Grand Poobah Joined: April-21-2005 Location: NE CT Status: Offline Points: 3359 |
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Another ditto what Joe sez
Next time skip the easy out, and go straight to the left handed bits. |
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"There is nothing, absolutely nothing, half so much worthwhile as messing around with boats...simply messing."
River Rat to Mole |
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baitkiller
Platinum Member Joined: October-11-2011 Location: SW Florida Status: Offline Points: 1693 |
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Got a welder? weld a nut on it.
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Jesus was a bare-footer.............
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TRBenj
Grand Poobah Joined: June-29-2005 Location: NWCT Status: Offline Points: 21171 |
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Yeah, what joe said. Some aftermarket manifolds only use 1 bolt per cylinder.
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JoeinNY
Grand Poobah Joined: October-19-2005 Location: United States Status: Offline Points: 5698 |
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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...
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kman
Senior Member Joined: May-30-2008 Location: United States Status: Offline Points: 161 |
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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...
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Kirk
1976 Southwind 20 Eagle Mountain Lake Fort Worth |
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