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exhaust on 318 chrysler


 
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modirt
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PostPosted: Sat Jun 29, 2019 1:28 pm    Post subject: exhaust on 318 chrysler Reply to specific post Reply with quote

Working on a piece of equipment with a 318 chrysler engine in it. Essentially about the same a 1972 dodge pickup engine.

Exhaust manifold has a male end that mates up to a flared female end on the exhaust pipe. Someone wedged a donut into the joint, but it didn't fit and was leaking gas. Donuts do not fit this joint and cannot find much that does. Some parts books suggest a flat flange gasket, but that doesn't look right either.

Am I correct that this is essentially a ball and flange joint that does not require any gasket at all?
 
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Steve@Advance
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PostPosted: Sat Jun 29, 2019 6:05 pm    Post subject: Re: exhaust on 318 chrysler Reply to specific post Reply with quote

It very well could be.

Common for exhaust not to have any gasket, just metal to metal good fit.

Try it, see if it seals. As long as it wasn't damaged from being forced to tighten on the donut, it may be ok. Some used short heavy springs under the bolts to keep the connection tight.

Some advantages to the ball and flange connection, it doesn't require perfect alignment and allows for the engine to move slightly on rubber mounts without stressing the manifold or pipe, and no gasket to fail.
 
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Bob
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PostPosted: Sat Jun 29, 2019 6:28 pm    Post subject: Re: exhaust on 318 chrysler Reply to specific post Reply with quote

CVPost-Steve@Advance wrote:
(quoted from post at 21:05:34 06/29/19) It very well could be.

Common for exhaust not to have any gasket, just metal to metal good fit.

Try it, see if it seals. As long as it wasn't damaged from being forced to tighten on the donut, it may be ok. Some used short heavy springs under the bolts to keep the connection tight.

Some advantages to the ball and flange connection, it doesn't require perfect alignment and allows for the engine to move slightly on rubber mounts without stressing the manifold or pipe, and no gasket to fail.


If it IS damaged/deformed, typically a shop that bends custom exhaust pipes will have a die for their machine to form such ends.

Likely, an experienced operator could reshape a damaged pipe using such a machine.
 
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jacksun65
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PostPosted: Sat Jun 29, 2019 7:06 pm    Post subject: Re: exhaust on 318 chrysler Reply to specific post Reply with quote

you are correct ball and flange joint end of pipe is flared and a fitting with two bolt holes slide over
it. should be two holes in exh manifold to match tow 5/16 bolts and nuts hold it together.
 
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modirt
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PostPosted: Sun Jun 30, 2019 5:29 am    Post subject: Re: exhaust on 318 chrysler Reply to specific post Reply with quote


Thanks for confirming this. Checked with two auto parts stores and they had no clue. Of course I did not take the exhaust manifold off to take with me, but did have the exhaust pipe to measure for size of a replacement gasket.

You might think if they worked there they would have seen it all and could tell you right off. Not so. I'd guess the vast majority of those folks know very little about much of anything related to cars and trucks beyond running the computer to find the part once you give them the engine, make and model, and how to run the charge machine. Some of them would likely struggle to make change if you handed them cash.

Remarkably, I ran it by a younger neighbor who has the same engine in two vehicles he is working on and he didn't seem to know either. I'm showing him how it works??????
 
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rustyfarmall
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PostPosted: Sun Jun 30, 2019 6:17 am    Post subject: Re: exhaust on 318 chrysler Reply to specific post Reply with quote


Flat gaskets were used in many different applications. More than the donuts.
 
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buzz saw
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PostPosted: Sun Jun 30, 2019 3:57 pm    Post subject: Re: exhaust on 318 chrysler Reply to specific post Reply with quote

CVPost-jacksun65 wrote:
(quoted from post at 20:06:35 06/29/19) you are correct ball and flange joint end of pipe is flared and a fitting with two bolt holes slide over
it. should be two holes in exh manifold to match tow 5/16 bolts and nuts hold it together.


Jack is correct that it is a flange on the pipe that seals to the ball on the manifold, no gasket required. I thought they were 3/8 X2.5 inch bolts but the result is the same. Good system that never leaked and would stand a little misalignment also. Worked at Chrysler dealers for over 20 years and don't remember ever seeing one leak.
 
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modirt
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PostPosted: Mon Jul 01, 2019 5:30 am    Post subject: Re: exhaust on 318 chrysler Reply to specific post Reply with quote

buzz saw wrote:
(quoted from post at 16:57:58 06/30/19)
CVPost-jacksun65 wrote:
(quoted from post at 20:06:35 06/29/19) you are correct ball and flange joint end of pipe is flared and a fitting with two bolt holes slide over
it. should be two holes in exh manifold to match tow 5/16 bolts and nuts hold it together.


Jack is correct that it is a flange on the pipe that seals to the ball on the manifold, no gasket required. I thought they were 3/8 X2.5 inch bolts but the result is the same. Good system that never leaked and would stand a little misalignment also. Worked at Chrysler dealers for over 20 years and don't remember ever seeing one leak.


Mating manifold cone to inside cone of the exhaust flange....no gasket at all....... is the only way to put it together than made any sense. Previous owner had managed to wedge donuts in there, but they were mangled and joint was only half sealed up.

Some parts books will show a flat gasket for this joint, and it will bolt up to the manifold part, but doesn't help the joint seal either......more like interferes with a good seal.

Don't normally do my own wrenching on stuff as I don't have the tools or shop for it, but I am on this project. This engine was new to me. Learning lots and having fun doing it.
 
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showcrop
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PostPosted: Mon Jul 01, 2019 8:54 am    Post subject: Re: exhaust on 318 chrysler Reply to specific post Reply with quote



One of the Ford N gurus posted about this last week. He said that the biggest thing is that the two sides have to line up so that they are even all the way around. Only then will the clamp be able to pull it together tightly enough.
 
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