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Restoration & Repair Tips Board

Stripped Stud

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Ed

07-08-2004 18:53:58




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Hello; One of the studs that holds a carburator in place is stripped. When I put the carburator on the studs and tighten the nuts , one stud just spins around. Carburator is sucking air. I do not think I can get a drill bit in there to drill and re-tap. Any ideas? Thanks in advance.




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txblu

07-16-2004 09:21:18




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 Re: Stripped Stud in reply to Ed, 07-08-2004 18:53:58  
Helical coil insert. It is a stainless steel thread and uses a slightly larger drill and tap than the specified size. Tap has HC on the dimensions etched in it. Machine shop should have all the parts including insertion tool. When finished, you insert the same size stud that you had originally.

Mark



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Ron

07-09-2004 10:39:11




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 Re: Stripped Stud in reply to Ed, 07-08-2004 18:53:58  
Studs are tightened only finger tight. If someone muscled it somehow, you have only one recourse. The stud has to come out (vise grips, whatever). The same size stud has to be used; if you drill and tap for a larger size you will need to drill the carburetor base too and that will likely crack the base.

Best bet is to remove the manifold, clean the hole with brake cleaner, fill it with JB Weld, and then using a gasket as a template, drill out a new hole to the proper size for the tap. Note that you will be blind-tapping so use a bottom tap and be very careful, especially in aluminum. When done, blow the chips out with more brake cleaner and reinstall a new stud finger tight with some anti-seize.

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Loren

07-17-2004 11:10:16




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 Re: Re: Stripped Stud in reply to Ron, 07-09-2004 10:39:11  
There are also step studs available at auto parts stores. Bigger hole with same size carb end.



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George

07-09-2004 11:31:27




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 Re: Re: Stripped Stud in reply to Ron, 07-09-2004 10:39:11  
If you can get the manifold off, the best thing you can do is to install a helicoil.



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George

07-09-2004 06:27:00




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 Re: Stripped Stud in reply to Ed, 07-08-2004 18:53:58  
If you are lucky, you might try securing the stud with JB Weld into the stripped hole. Both the stud and the damaged hole need to be really clean. Be careful when torquing.



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Brad_fromTN

07-10-2004 21:50:13




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 Re: Re: Stripped Stud in reply to George, 07-09-2004 06:27:00  
I would probably use heli-coil. I love JB weld and use it often, but I'm not so sure I would use it on something like this. I'd be concerned about heat meltdown.

Loctite 620 high heat retaining compound might work though.



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Ron

07-11-2004 02:40:09




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 Re: Re: Re: Stripped Stud in reply to Brad_fromTN, 07-10-2004 21:50:13  
JB Weld is good to 650F and is plenty strong enough to use in a low-torque application like this... I've done it in aluminum manifolds several times. I've also used it to reattach the mounting ears on carburetor bases where some gorilla had snapped them off.



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