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Unread 03-08-2013, 06:03 AM   #1
jdhaas3
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2008 JK Wrangler 
 
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Location: Chesapeake, Virgina
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1976 CJ7 Exhaust Leak

Recently purchased my 76 CJ7 and I am trying to tackle the exhaust leak. I have the 4.2L inline 6 with true dual exhaust on it. Both of the pipes are put together with a muffler clamp and it looks like the exhaust pipe is just pushed into the header. There is no header flange/gasket installed. Both joints are leaking pretty badly. I crawled underneath while it was running and just felt around the joints and could feel pretty good bit of puffing around there. I do not know the brand of header or exhaust, both look pretty crappy IMO. Should I just replace everything? Should I just cut the pipe from the header and weld on a flange that I can bolt up to a new set of pipes with a gasket in place? Here is a picture of one.



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Unread 03-08-2013, 09:54 AM   #2
jdhaas3
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anybody have any advice on this?
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Unread 03-08-2013, 10:41 AM   #3
walkerhoundvm
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I'd say you'd have less work but more money in replacing the whole thing. How is the rest of your set-up? Do you have an OEM intake manifold?

For the cut and weld approach, you'd probably have to flare the header, and the exhaust pipe after sliding new flanges on. I couldn't do it, but sounds like you have the ability.

While you're at it, you might just as well clean up the headers and strip them with phospho-etch, then paint with exhaust paint. That way you'd get a little more life out of them, maybe?
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Unread 03-08-2013, 11:36 AM   #4
jdhaas3
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Quote:
Originally Posted by walkerhoundvm View Post
I'd say you'd have less work but more money in replacing the whole thing. How is the rest of your set-up? Do you have an OEM intake manifold?

For the cut and weld approach, you'd probably have to flare the header, and the exhaust pipe after sliding new flanges on. I couldn't do it, but sounds like you have the ability.

While you're at it, you might just as well clean up the headers and strip them with phospho-etch, then paint with exhaust paint. That way you'd get a little more life out of them, maybe?
I dont really have the ability but my buddy does, I would be just helping and learning pretty much. The intake is offenhauser.
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Unread 03-08-2013, 12:13 PM   #5
walkerhoundvm
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Offenhauser intake makes it an easier choice - you'd probably have to go with a matching header to replace or go back to stock to make things easiest. A stock exhaust manifold wouldn't match up well both in size and components (i.e. EGR setup).

Sounds like trying to fix this one up is the best choice for the short term (5 years?). I'd definitely clean it, etch it, and paint. You could do the intake at the same time, even, since you'll have the whole thing off.
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Unread 03-11-2013, 07:22 AM   #6
jdhaas3
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Quote:
Originally Posted by walkerhoundvm View Post
Offenhauser intake makes it an easier choice - you'd probably have to go with a matching header to replace or go back to stock to make things easiest. A stock exhaust manifold wouldn't match up well both in size and components (i.e. EGR setup).

Sounds like trying to fix this one up is the best choice for the short term (5 years?). I'd definitely clean it, etch it, and paint. You could do the intake at the same time, even, since you'll have the whole thing off.
Pretty sure I going to be going with option two on this one. I just spoke with an exhaust shop and they are going to go in and clean up the pipe and just redo everythign from the header back.
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