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Allis Chalmers Discussion Forum
:

B manifold Threading. Dick L , maybe?

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loveshisalis

09-25-2011 13:10:16




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Hey dere;

I read that an 1" and a quarter inch tapered pipe tap is what to use to do the job in a Allis B stock manifold. Where can I pick on of these up, and then where do I get the nipple that goes inside of this? precciate the help




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steve(ill)

09-27-2011 15:46:17




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 Re: B manifold Threading. Dick L , maybe? in reply to loveshisalis, 09-25-2011 13:10:16  
look up "plumber" in the local small town phone book. Pay him $10, and let him tap it in 10 minutes while you wait.



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Bob Bancroft

09-25-2011 16:38:54




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 Re: B manifold Threading. Dick L , maybe? in reply to loveshisalis, 09-25-2011 13:10:16  
An AC B stock manifold was never threaded. And I would guess trying to thread an old one would bust it.



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Dick L

09-25-2011 19:23:31




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 Re: B manifold Threading. Dick L , maybe? in reply to Bob Bancroft, 09-25-2011 16:38:54  
Old ones are easier to tap than new ones because the hole is a little larger. Takes less work to get the 1 1/4" tap down 3/4 the way on the tap.

I tap every one of my manifolds. All of my tractors set out side year around. seals the water out.

New one tapped in this picture.

third party image

third party image

I have a picture in my fotki site some where of one of the old manifolds that I had tapped. Couldn't find it just now.

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thebigyellowtruck

09-26-2011 08:56:16




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 Re: B manifold Threading. Dick L , maybe? in reply to Dick L, 09-25-2011 19:23:31  
have you ever tapped a WD all fuel manifold?(with the bolt on plate) if so what size is it? thanks



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Dick L

09-26-2011 11:02:45




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 Re: B manifold Threading. Dick L , maybe? in reply to thebigyellowtruck, 09-26-2011 08:56:16  
No sir, I have not. I have never owned a WD but you can find out what size of tap needed with a ruler or set the correct sized pipe nipple over the hole.



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thebigyellowtruck

09-27-2011 06:57:19




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 Re: B manifold Threading. Dick L , maybe? in reply to Dick L, 09-26-2011 11:02:45  
thanks Dick. I think that will be a project for next spring.



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Bob Bancroft

09-25-2011 23:40:27




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 Re: B manifold Threading. Dick L , maybe? in reply to Dick L, 09-25-2011 19:23:31  
So many manifolds I have seen are so rotten you can hardly look at them, let alone tap them- I am impressed! I wonder how many manifolds the average guys without your skill have busted?! I suppose a manifold AND tap that are in good condition makes the difference.



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Dick L

09-26-2011 04:24:51




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 Re: B manifold Threading. Dick L , maybe? in reply to Bob Bancroft, 09-25-2011 23:40:27  
A sharp tap does not put a great deal of out ward pressure when only turning the larger tap in an 1/16 to 1/8 of a turn before backing the tap up to clear the chips.



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loveshisalis

09-25-2011 20:31:24




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 Re: B manifold Threading. Dick L , maybe? in reply to Dick L, 09-25-2011 19:23:31  
Hey DickL;

Also, do I have to pull the clutch off to replace the ring gear off the flywheel? I got that job coming up too. In the menatime, got to line upa 1-1/4" tap, .
tanks



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loveshisalis

09-25-2011 20:29:15




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 Re: B manifold Threading. Dick L , maybe? in reply to Dick L, 09-25-2011 19:23:31  
hey DickL;

Thanks for the good tips. I might try that lifting trick using the stud girdle like you did. Sure daves having to pull the head bolts when lifting the mill ! .

appreciate all the good help



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DiyDave

09-25-2011 16:25:48




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 Re: B manifold Threading. Dick L , maybe? in reply to loveshisalis, 09-25-2011 13:10:16  
You can get both at McMaster-Carr, or MSC, or Enco. Google any or all of 'em



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Bob

09-25-2011 13:19:07




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 Re: B manifold Threading. Dick L , maybe? in reply to loveshisalis, 09-25-2011 13:10:16  
You can buy or order a 1-1/4" pipe tap for $$$$ at ANY hardware store.

You can probably find a reasonably good one on fleabay for a LOT less, or perhaps borrow one.

The pipe is simply 1-1/4" black pipe, even the "big box stores" probably have it in their plumbing dept.



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