Re: Muffler to manifold clamp

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Posted by Ed Gooding (VA) on May 31, 2022 at 06:37:02 [URL] [DELETE] :

In Reply to: Re: Muffler to manifold clamp posted by Zeke on May 29, 2022 at 23:26:26:

Bruce's detailed instructions came from a document that he authored on replacing the manifold. Here is the content regarding attaching the exhaust pipe to the manifold:

This method of attaching the exhaust pipe to the manifold was developed for the Model A Ford in 1927. If you pay attention to what you are doing, it will not leak. You do not need tinfoil or gasket sealer to prevent leaks. Use the correct parts and install them correctly and it will not leak.

Make sure you are using the correct clamp. An automotive muffler c-clamp will not work. You need a clamp made for the N. If you have the correct clamp, it has a top and bottom. Make sure you have the clamp on correctly. The exhaust pipe clamp has a big side and a small side. The big side goes to the bottom.

All clamps are not created equally; the correct clamp should have 9/16" brass nuts.

Slide the tailpipe into the hanger clamp and then place the end of the exhaust pipe against the manifold. Look at it!

Remember, the pipe will almost always fit snugly to the OEM manifold w/o any problem, but a replacement manifold will likely not be the exact same size as the OEM manifold, so you will have some work to do. If it does not mate all the way around, put a broomstick down the pipe and into the manifold and gently bend the pipe until both surfaces mate snugly and squarely. If the exhaust pipe flange is bent, you will never get a good seal; check it out. The clamp is not a gasket; if the pipe and manifold do not mate tightly, it will leak. Do not try and hold the exhaust pipe against the manifold w/ your hand while you tighten the clamp. Get out your floor jack and a block of wood; put the jack under the pipe to hold it tightly against the manifold. Confirm that the pipe is mated squarely to the manifold; if it is crooked, it will not seat. With the pipe jacked snugly and squarely to the manifold use your lb. ball-peen hammer and tap the pipe tight to the manifold flange all the way around. It's a soft metal and this will only take about a minute. Tighten the clamp. (Don't get carried away w/ the jack or you will bend the pipe. Or, overtighten the clamp and snap it in two. BTDT). Put equal pressure on the clamp by tightening one side a few turns and then a few turns on the other. Do not expect the clamp sides to touch; about a 1/8 gap is normal.

When the clamp is tightened equally on both sides, remove the jack. If the pipe flops around, start over because you put the clamp on upside down.

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