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Farmall & IHC Tractors Discussion Forum
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how do I restore threads in exhaust manifold?

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bigmike312

08-25-2004 18:28:11




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I'm in the process of restoring my dad's "M" and the threads in the top of the exhaust manifold are in really bad shape. Any ideas on how I can fix this short of buying a new manifold? Thanks.....




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Hayfarmer

08-26-2004 07:20:11




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 Re: how do I restore threads in exhaust manifold? in reply to bigmike312, 08-25-2004 18:28:11  
I had a similar problem on my SMTA. I couldn"t locate a 2 inch pipe tap so I got a 2" pipe nipple, cut across the threads in about 3 or 4 places with a hacksaw, perpendicular to the threads. I threaded it into the manifold, then unscrewed it, and back in a little deeper each time. I was worried about putting too much pressure on the manifold for fear of cracking it. It seemed to work on mine but yours might be worse. Worth a try anyway. I also put a handtowel with some grease on it below the exaust outlet in the manifold to catch any filings.

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texp

09-04-2004 06:51:45




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 Re: how do I restore threads in exhaust manifold? in reply to Hayfarmer, 08-26-2004 07:20:11  
I had the same problem with my 300 manifold I got lucky and went to a local rental place . . .they had a tap, cost me about 5 bucks for 1 day.
tex



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jonesy

08-26-2004 05:32:59




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 Re: how do I restore threads in exhaust manifold? in reply to bigmike312, 08-25-2004 18:28:11  
a 2" pipe tap lists for $230.00 @ Grainger. I got one on Ebay for $30 new. You can probably take it to a machine shop and they will run a tap through it for next to nothing.



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dhermesc

08-26-2004 05:49:51




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 Re: how do I restore threads in exhaust manifold? in reply to jonesy, 08-26-2004 05:32:59  
Or, you can pull it off and take it to a local plumber and have hime use his pipe threader on it. Costed me $10.00.



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rustyfarmall

08-25-2004 18:54:59




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 Re: how do I restore threads in exhaust manifold? in reply to bigmike312, 08-25-2004 18:28:11  
There was some discussion on this same subject just recently, you might check through the archives to get all the details. Basically, you can get a two inch pipe tap and more or less cut new threads. I have done this myself on an M and a couple of Hs. It works pretty good.



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Loren

08-25-2004 18:38:04




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 Heli-coil. in reply to bigmike312, 08-25-2004 18:28:11  
Done correctly will provide very good threads.



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Brian Schmidt

08-25-2004 19:43:02




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 Re: Heli-coil. in reply to Loren, 08-25-2004 18:38:04  
Is there such a thing as a 2" pipe Heli-coil? I know I have never seen one.



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Loren

08-26-2004 19:22:50




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 All I can say is Duh! in reply to Brian Schmidt, 08-25-2004 19:43:02  
I didn't think again.



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