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Restoration & Repair Tips Board

broken and burnt off manifold bolts

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chknthief@msn.com

12-25-2006 10:59:03




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Can anyone help me? I have a 50 jd that has a couple of exhaust manifold bolts that are burnt off, any suggistons on how to get them out




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Kklobru

12-25-2006 20:30:41




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 Re: broken and burnt off manifold bolts in reply to chknthief@msn.com, 12-25-2006 10:59:03  
I've welded nuts to the broken off bolts before and backed them out before they cooled off. You will need to weld INSIDE the nut, and a wire welder works best for this. I've had very good luck doing this. Good Luck



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showcrop

12-25-2006 14:02:41




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 Re: broken and burnt off manifold bolts in reply to chknthief@msn.com, 12-25-2006 10:59:03  
Just pick up a set of screw extractors, they are kinda the inverse of easy outs, they grip onto the little remains. with a little PB blaster I was amazed at how easily they came out. good luck!



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Stumpalump

12-25-2006 12:44:50




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 Re: broken and burnt off manifold bolts in reply to chknthief@msn.com, 12-25-2006 10:59:03  
I've seen muffler shops melt out broken studs in manifolds with oxy-acetelene torch. The steel bolts melt out before the cast melts. It even left clean threads. I don't think it's quite as easy as it looked but thats how they do it.



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Dandy Dave

12-29-2006 09:19:24




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 Re: broken and burnt off manifold bolts in reply to Stumpalump, 12-25-2006 12:44:50  
I've burned them out with a torch myself before. The way I've done it is to first drill a hole thru the broken stud so there is a blow hole. you have to be quick about it or you will screw up the treads. This will not work in a blind hole though and I only do it as a last resort as the heat could crack a thin casting. It is necessary to run a tap thru the holes after to clean them up. Yeah, It's an art! Good Luck, Dave

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