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Tool Talk Discussion Forum

Building up a carb shaft

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DCM

10-14-2007 07:51:17




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Have a groove worn into an old carb shaft(butterfly shaft),could I build that up with JB weld or are there some other ideas out there without getting too expensive or complicated.Dan




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335LP

10-15-2007 06:17:56




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 Re: Building up a carb shaft in reply to DCM, 10-14-2007 07:51:17  
Heat from brazing build up will warp the shaft and it won't be straight to make butterfly work again. If worn that bad probably need new butterfly disk anyway too. New shafts should be available or can make one fit from some other carb also. Marvel Schebler and Zenith and many others furnished bronze bushings to put in housing for wear repairs but best to use a new shaft along with those. Try VE Petersen 800-537-6212.

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T_Bone

10-14-2007 22:26:32




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 Re: Building up a carb shaft in reply to DCM, 10-14-2007 07:51:17  
Hi DCM,

I think this a perfect place to use JB weld as it would be the easist to use with the least amount of headaches. All your trying to achieve is a close seal. Even waxed thread would accomplish that.

T_Bone



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Kentb of SWMO

10-14-2007 16:08:46




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 Re: Building up a carb shaft in reply to DCM, 10-14-2007 07:51:17  
Phos-copper rod works better on brass. Brazing rod, bronze, does not work as good.

Kent



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oldhousehugger25

10-14-2007 10:11:08




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 Re: Building up a carb shaft in reply to DCM, 10-14-2007 07:51:17  
You can easily build up the shaft with brazing rod and then file it back down pretty close to original. Then even if you don’t have a lathe or drill press, you can chuck it into an electric drill motor and sand it close enough to work. Brass is still harder than a pot metal carb body and it won"t rust either. As others have said what you are after is reducing the slop so air won’t leak in and the butterfly won’t stick. Good luck

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Bob

10-14-2007 10:16:11




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 Re: Building up a carb shaft in reply to oldhousehugger25, 10-14-2007 10:11:08  
Many of the old carb shafts ARE brass. It takes a pretty sharp operator to braze up a SMALL brass shaft!



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Bob

10-14-2007 08:43:41




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 Re: Building up a carb shaft in reply to DCM, 10-14-2007 07:51:17  
What carburetor... something REALLY "odd"? If not, there may be some reasonably-priced NEW shafts around.



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steve from mo - dangit!

10-14-2007 08:02:24




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 Re: Building up a carb shaft in reply to DCM, 10-14-2007 07:51:17  
The general method is to put a bushing in the carb body. You don't need zero clearance, just minimal leakage.



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RustyFarmall

10-14-2007 08:48:21




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 Re: Building up a carb shaft in reply to steve from mo - dangit!, 10-14-2007 08:02:24  
Most carb kits come with a new shaft which takes care of most of that wear. Sometimes a new bushing is also needed. Usually the end of the shaft that is worn is the business end, or the end that has the lever on it. If you install a new bushing to take care of the wear on that end, then the other end of the shaft won't fit through it and you are right back to square one.

Don't know about the J.B. weld, but I'd think that if the carb or tractor will not be seeing extensive use, or subjected to a lot of heat, it might just work. Especially if it is an odd-ball or obsolete carb that parts are not readily available for.

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