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Allis Chalmers Discussion Forum
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Repair (possible) stripped bolt hole-Allis B

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Mark Kluber

07-26-2006 21:00:18




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Do they make a self-tapping (threading) bolt (1/2")to rethread a hole to mount a drawbar on Allis B ?
Suggestions for mounting the drawbar when alone? The drawbar is the type with the pin to adjust the level.

Thanks, Mark




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steve(ill)

07-27-2006 16:10:27




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 Re: Repair (possible) stripped bolt hole-Allis B in reply to Mark Kluber, 07-26-2006 21:00:18  
original first couple years were 1/2 inch. later changed to 5/8. i would drill all out and retap to 5/8 size.



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MLD

07-27-2006 09:33:21




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 Re: Repair (possible) stripped bolt hole-Allis B in reply to Mark Kluber, 07-26-2006 21:00:18  
Most hardware & automotive stores have a "HELI" coil set you can buy. These are made to replace damaged threads, check into it, you may be able to fix yours? If you drill it out, make sure you've got a good tap & dye set!!



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Dick L

07-27-2006 07:39:34




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 Re: Repair (possible) stripped bolt hole-Allis B in reply to Mark Kluber, 07-26-2006 21:00:18  
If you decide to drill your drawbar out larger and have a good 1/2 or 5/8 electric drill, (slower speed) use a masonry bit and not a lot of down pressure. It will walk right thru. If you catch the carbide insert in the hole it will break. Carbide is brittle. I have been using masonry bits in my tool shop for many years on hard steel to drill non precision holes. I like to dress the carbide insert a little but they will still work as you buy them.

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D13

07-27-2006 07:20:54




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 Re: Repair (possible) stripped bolt hole-Allis B in reply to Mark Kluber, 07-26-2006 21:00:18  
Some of mine have bee upsized to 9/16 or even 5/8". Have to resrill the drawbar too which gets messy at 5/8.



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old

07-26-2006 22:00:21




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 Re: Repair (possible) stripped bolt hole-Allis B in reply to Mark Kluber, 07-26-2006 21:00:18  
You might be able to do a HELI coil in it.



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