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Farmall & IHC Tractors Discussion Forum
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Exhaust manifold Tap

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Freud

03-22-2005 16:19:40




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I was told by a friend of mine awhile back that I can retap the threads in my exaust manifold where the pipe comes out of the manifold and clamps to the muffler. I have a 1952 Super M and the threads are corroded pretty good and they simply need to be rethreaded. Problem is: where on earth can I find a 2.25 inch pipe thread tap? Any help would be appreciated.




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BillWV

03-28-2005 05:09:35




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 Re: Exhaust manifold Tap in reply to Freud, 03-22-2005 16:19:40  
I got by with a piece of pipe the right size. Cut 4 or 5 slots lengthwise across the threads, clamped the manifold in a vise, and worked the pipe in and out 1/4 turn at a time with a pipe wrench. It took a while, but got about 1-1/2" of usable threads in the manifold. Works fine.

Good luck,
Bill



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Randy SE-MN

03-23-2005 05:31:25




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 Re: Exhaust manifold Tap in reply to Freud, 03-22-2005 16:19:40  
Just a question to you fellers...Did the diameter of the exhaust pipe/muffler inlet ever change from the M's through the 450's?



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Andy Martin

03-23-2005 05:19:34




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 Re: Exhaust manifold Tap in reply to Freud, 03-22-2005 16:19:40  
As a last resort, weld the pipe stub into the manifold. Get the manifold hot by running the tractor after grinding everything well. Then weld it out with nickle rod (NiRod) and restart the tractor to help it cool down slowly.



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Aces

03-22-2005 19:51:38




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 Re: Exhaust manifold Tap in reply to Freud, 03-22-2005 16:19:40  
Freud Mkae sure you use a National trpper pipe or NPT not a straight pipe if you use a straight pipe tap the pip[e will not get tight after you clean the threads. And it is 2" NPT not 2-1/4" NPT. The best way to tap the manifold is with it on the tractor, never did it anyother way.



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jonesy

03-22-2005 19:49:48




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 Re: Exhaust manifold Tap in reply to Freud, 03-22-2005 16:19:40  
Thats nothing more than a 2" NPT tap. THey list for $230 @ Grainger but I bought one on Ebay for $30.



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MagMan

03-22-2005 18:47:57




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 Re: Exhaust manifold Tap in reply to Freud, 03-22-2005 16:19:40  
I have a HSS Tap that I was told listed for $170.00 And could probly tap more manifolds than I would ever run into I live in NY if your close. MagMan



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dr.sportster

03-22-2005 18:25:36




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 Re: Exhaust manifold Tap in reply to Freud, 03-22-2005 16:19:40  
Hey I just told you on Tool Talk.Cant write anymore my hands hurt.go to tool tal.....



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r4etired

03-22-2005 17:55:41




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 Re: Exhaust manifold Tap in reply to Freud, 03-22-2005 16:19:40  
If you don't find a tap, go to a commercial mechanical contractor, ask him to deep thread you a piece of 2in schedule 40 black pipe. I cut these for farmers here in this area. I have the tap and have also cracked manifolds being very carefull. normally if you wire brush out the threads you have left, the deeper thread will hold well



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Bob Frey

03-22-2005 17:49:07




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 Re: Exhaust manifold Tap in reply to Freud, 03-22-2005 16:19:40  
I found a good 2" pipe tap on ebay. Think I paid under $20 for it and it works great. If you are anywhere around northwest Iowa I would be happy to loan it to you.

Bob



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Dixieland

03-22-2005 17:26:32




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 Re: Exhaust manifold Tap in reply to Freud, 03-22-2005 16:19:40  
You can find these taps on ebay but I will tell you now it ain't no easy job. You will need a sturdy bench vice to hold the manifold along with a large crescent wrench and be very carefull about getting it true, then just take your time and tap a quarter round at a time then back off and go again. the use of Oil is a good susggestion. You might want to check with your local machine shop. Could be cheaper.

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Wayne Swenson

03-22-2005 16:40:02




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 Re: Exhaust manifold Tap in reply to Freud, 03-22-2005 16:19:40  
Do you have a plumber friend you can borrow from?
Take your time and use lots of lube when re-threading the manifold.



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Haas

03-22-2005 16:29:26




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 Re: Exhaust manifold Tap in reply to Freud, 03-22-2005 16:19:40  
It's standard two inch size pipe threads. Nominal size 2 inch pipe is larger than 2 inches in diameter, as I recall about 2 3/8 inch OD. You can get 2 inch NPS pipe tap at about any hardware supply house. Not cheap for a good one though. You could try to borrow one from a plumber. Also I think Northern tool has some cheapo ones that should be good enough to do your rethreading.



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