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  #1  
Old August 13th, 2005, 09:09 AM
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Rich Campbell
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Exhust manifold

Hi everyone,
I had my gaskets replaced yesterday due to some leaking at the manifolds. It worked for a while but the leak has returned. The shop is telling me the manifold is tweaked. They say they can't use any sealant because it burns out. It is a small leak but I would like to get rid of the tapping noise I get.
Is there any sealant I can use that will not burn out?
Thanks
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Old August 13th, 2005, 09:12 AM
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I had a leak once from my manifolds it turned out to be at the junction between the y-pipe and the manifold, make sure all of that is tight as well.
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Old August 13th, 2005, 09:18 AM
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Rich Campbell
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I think that is where the leak is. Where the manifold attaches to the exhust.

Follow-up Post:

They can't get it to seal. They put new gaskets in and sealant and it worked for a while but they sealant burned out. They are telling me the manifold is tweaked so it will not seal up.
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  #4  
Old August 13th, 2005, 10:09 AM
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Hey Richard, I have been told when you put in new gaskets where the Y pipe and the manifold meet you will need to retighten them after everything has heated up and cooled down a couple times because the gaskets shrink a little. I have removed and installed the Y pipe a few times and the only way I can get a real good seal is to put it on, tighten it up, then smack the bottom with a hammer a few times, retighten and repeat until it seals well. This has worked very well for me on a couple Rovers when I could not get it to seal using conventional methods. The Y pipes are hard to get lined up and this is the easiest way, and when I install them itís just me, no one else giving me a hand.
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Old August 13th, 2005, 10:17 AM
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I am with Mike on that one--I basically do the same thing. Also, make sure there is not a leak where the flange is welded onto the pipe, sometimes they crack there. Usually you can see the blackening area. Also, if the flanges have issues, they can be easily ground down flat (well, easily if you remove them). Mike's method has worked for me, though.
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Old August 13th, 2005, 12:04 PM
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Thanks I will give both of those a try. man you guys know your stuff!

Follow-up Post:

Mike,
Is there any sealant that can withstand the heat at this connection? The highest I saw at PepBoys was 700degrees.
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Old August 13th, 2005, 03:16 PM
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They do make exhaust specific sealants, usually it's in the muffler section. But they're right, the gaskets will heat-cycle a bit, and might need to be retightened a couple times before they seal perfectly.

If the manifold IS tweaked, a machine shop should be able to shave the surface flat again fairly cheaply.

-Hans
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  #8  
Old August 13th, 2005, 10:35 PM
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You need to take the manifold off and take a file and file it level. This will work. If you were really anal, you would send it off to be machined (or just buy a new manifold).
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