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Farmall & IHC Tractors Discussion Forum
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re-threading exhaust manifold

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James

02-03-2004 04:59:19




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I have a '54 Farmall Super A. The exhaust pipe has erroded to the point that there is almost nothing for the exhaust stack to clamp to (the stack wobbles a lot). Would it be worth the trouble to re-tap the threads on the exhaust manifold rather than replace the manifold? The old exhaust pipe is rusted in place. Can I re-tap the thread even though the old exhaust pipe is rusted in place? Thanks!

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Dave

02-05-2004 04:54:52




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 Re: re-threading exhaust manifold in reply to James, 02-03-2004 04:59:19  
I've done this twice. Both times I was able to use a chisel and hammer to remove the old rusted, broken pipe. Them I took a thread file and cleaned up the threads, then went to the hardware, bought a nipple threaded on both ends. Cut it in half. Used one end to run down inside to clean the threads and make them a little deaper (Actually just cleaned the previouly unused threaded portion, and used the other as my new pipe.....

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rustyfarmall

02-03-2004 09:34:37




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 Re: re-threading exhaust manifold in reply to James, 02-03-2004 04:59:19  
You can buy a set of 3 pipe taps from the Northern catalog, or visit one of their retail outlets. You will only need the 1-1/2 size, but if you get an H or M later on, then you will need the 2 inch size. I bought a set of these several years ago, and for the price I paid I think the quality is very good. The last time I checked the catalog the price of this item was under $40. Might be higher now, but still worth checking out.

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Dave_ID

02-03-2004 07:43:25




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 Re: re-threading exhaust manifold in reply to James, 02-03-2004 04:59:19  
YEs, once you get the old pipe out, you can run a 1 1/2 inch pipe tap deeper to give you some more threads. Buy a pipe nipple from a hardware store,, saw off one end to cut to length and screw it in. If you can rent a pipe tap, it's a heckuvalot cheaper than buying one.



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Greg-n-CA

02-03-2004 06:40:00




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 Re: re-threading exhaust manifold in reply to James, 02-03-2004 04:59:19  
I'm having a similiar problem on my BN. I heated the pipe and the manifold (carefully) with a gas tourch. Once I got the pipe cherry red, I let it sit and cool. I did this twice and the pipe unscrewed without any problem. Next I will take it to a plumbing/well shop to have the threads cleaned up with a die. They will only charge a few dollars to do it. Good luck!



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dhermesc

02-03-2004 05:47:20




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 Re: re-threading exhaust manifold in reply to James, 02-03-2004 04:59:19  
Best luck I had was taking the manifold to a local PLUMBER. He had all the cutting tools to remove the old pipe and a dye big enough to clean the threads up once it was out. He charged me $40.00 to do it. Much cheaper then a machine shop was going to charge and less then half to replace it new or used.



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Wayne Swenson

02-03-2004 18:56:51




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 Re: Re: re-threading exhaust manifold in reply to dhermesc, 02-03-2004 05:47:20  
Correction needed, folks! A thread DIE is used to put threads on the outside of a bolt or pipe.
A thread TAP is used to put threads on the inside of a hole.
Most times a plumbing shop will be very helpful to re-thread the hole in the manifold; it is something different than the jobs they usually get so is interesting.
Plus, you might find some new sources for parts, info, etc.!!



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Farmallkid

02-03-2004 05:18:13




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 Re: re-threading exhaust manifold in reply to James, 02-03-2004 04:59:19  
You will have to get the pipe out of the manifold. We had to re-thread my manifold, we got a dye or what ever it is from the company that makes the wolfe tiler machines, they are located close to where my dad works. We had to be careful how we did it, the dye is $400 +. You might want to try pb blaster to get the pipe loose, i have never used it, but heard it works real good. If you go to a tool and dye somewhere, you should be able to get a new pipe threaded and a dye, you might have to take the tractor there to thread it. hope this helps.

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