The Ford Barn

agriscience · 09-08-2010, 10:48 PM

Need to chase the threads!
What is the size and pitch?
Thanks in advance!
Steve

John Otis · 09-09-2010, 07:00 AM

I took the easy way out. I had an old exhaust manifold kicking around that was badly cracked but had excellent threads. I took a very sharp file and used the corner to cut V grooves acress the threads, basically making the old manifold into a giant tap. Whenever I had to freshen up an exhaust pack nut I would clamp the old mainifold into the vise and using my big wrench would work the nut back and forth on the old manifold's threads. It worked great.

Doug Money · 09-09-2010, 08:04 AM

Manifold threads are 1 7/8-16.

agriscience · 09-09-2010, 10:41 AM

Thank You all for the information!!!

Cool Hand Lurker · 09-09-2010, 10:57 PM

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You may not actually need to do anything with the threads. If you are tightening the nut like I used to do, the problem may not be the nut on the manifold. In my case it was the nut behind the wrench... me!

I would try to tighten the nut really snug but it always slipped the threads. I had been putting the nut on as far as it would go but the pipe was still loose. Then I saw in the catalog that they called it a "packing nut." So I wound a loop of fiberglas wood stove door gasket rope around the exhaust pipe and stuffed it into the packing nut before tightening it up. I was able to get the nut tight without it slipping on the threads and the pipe was pulled in tightly with no leaks. The rope took up the slack and provided a good seal.

09-08-2010, 10:48 PM	#1
agriscience Member Join Date: May 2010 Posts: 50	Model T exhaust nut threads Need to chase the threads! What is the size and pitch? Thanks in advance! Steve

09-09-2010, 07:00 AM	#2
John Otis Senior Member Join Date: May 2010 Location: Vermont and Florida Posts: 188	Re: Model T exhaust nut threads I took the easy way out. I had an old exhaust manifold kicking around that was badly cracked but had excellent threads. I took a very sharp file and used the corner to cut V grooves acress the threads, basically making the old manifold into a giant tap. Whenever I had to freshen up an exhaust pack nut I would clamp the old mainifold into the vise and using my big wrench would work the nut back and forth on the old manifold's threads. It worked great.

09-09-2010, 08:04 AM	#3
Doug Money Senior Member Join Date: Jul 2010 Posts: 350	Re: Model T exhaust nut threads Manifold threads are 1 7/8-16.

09-09-2010, 10:41 AM	#4
agriscience Member Join Date: May 2010 Posts: 50	Re: Model T exhaust nut threads Thank You all for the information!!!

09-09-2010, 10:57 PM	#5
Cool Hand Lurker Senior Member Join Date: May 2010 Location: So Minn Posts: 1,565	Re: Model T exhaust nut threads Sponsored Links (Register now to hide all advertisements) You may not actually need to do anything with the threads. If you are tightening the nut like I used to do, the problem may not be the nut on the manifold. In my case it was the nut behind the wrench... me! I would try to tighten the nut really snug but it always slipped the threads. I had been putting the nut on as far as it would go but the pipe was still loose. Then I saw in the catalog that they called it a "packing nut." So I wound a loop of fiberglas wood stove door gasket rope around the exhaust pipe and stuffed it into the packing nut before tightening it up. I was able to get the nut tight without it slipping on the threads and the pipe was pulled in tightly with no leaks. The rope took up the slack and provided a good seal.