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Allis Chalmers Discussion Forum
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Help-busted bolt removal

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emblymouse

07-11-2006 08:19:58




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Kinda basic but I'm truly stuck. I twisted the head off a small bolt while removing thermostat housing on my WD. What do I do and how do I do it? Thanks!




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54 AC

07-12-2006 18:22:12




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 Re: Help-busted bolt removal in reply to emblymouse, 07-11-2006 08:19:58  
Go to an auto parts store and ask for a reverse drill bit. Go with a size smaller than the bolt and drill it out backwards. Many will laugh, but they do make reverse drill bits.



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Mike Hornberger

07-11-2006 13:45:43




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 Re: Help-busted bolt removal in reply to emblymouse, 07-11-2006 08:19:58  
Can you get the rest of the housing off and get some vice-grips on the stud? If not (or even if you can), then I second the welding option. I just did one last weekend with the welder. It works great if you can get to it. The heat also helps break the rust seal. If welding isn't an option, you may want to try drilling down through the stud with a reverse drill bit. Sometimes it will grab it and pull it out. If a reverse bit isn't an option, drill it with a forward bit. Try to get the hole as close to center as possible. Keep drilling with bigger and bigger bits. Once you get the hole really close to the housing threads, you can sometimes use a hammer and punch to fold down the remaining wall of thinned bolt enough to get some needle nose pliers on it and unscrew it. If it's not out by now, keep drilling untill only the bolt threads are left inside the female housing threads. Then you can use a tap or a small pick to clean them out. If the female threads are history at this point, you have two options - drill a bigger hole and tap a bigger thread size or use heli-coil. Take a look at>Link
Mike

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emblymouse

07-11-2006 20:55:05




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 Re: Help-busted bolt removal in reply to Mike Hornberger, 07-11-2006 13:45:43  
Many thanks guys- It rained all day here and I haven't been back to look at it but I'm thinking it's snapped off pretty close to flush. I've heard about a reverse drill bit but before I destroy whats left of it I'll run the welding idea past my neighbor who can help me. It really is helpful to know the descriptive details and logic behind this stuff before I get ahead of myself and burn my bridges. This kind of information just isn't in any of the books!

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BCnT

07-11-2006 09:17:20




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 Re: Help-busted bolt removal in reply to emblymouse, 07-11-2006 08:19:58  
under no circumstances allow the words ''ez-out'' come into play cause they aint and they dont.

only 2 options...1. drill it out and retap [requires a pretty steady hand and alot of luck doin it freehand]
2. weld a washer onto whats left and then weld a nut onto washer and unscrew it...works great



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