5.0L (1979-1995) Mustang Technical discussions on 5.0 Liter Mustangs within. This does not include the 5.0 from the 2011 Mustang GT. That information is in the 2005-1011 section.

exhaust leak at flange between h-pipe and manifold...

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Old Jun 24, 2007 | 04:58 AM
  #1  
mobileaudio219's Avatar
mobileaudio219
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Default exhaust leak at flange between h-pipe and manifold...

My exhaust is leaking at the flange between the headers and h-pipe. I've heard you can use a copper sealant on the flange and it seals it up? Anybody ever try this?

Old Jun 24, 2007 | 05:20 AM
  #2  
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Default RE: exhaust leak at flange between h-pipe and manifold...

uhh no.
Old Jun 24, 2007 | 07:35 AM
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Default RE: exhaust leak at flange between h-pipe and manifold...

dont use it...
Old Jun 24, 2007 | 10:14 AM
  #4  
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Default RE: exhaust leak at flange between h-pipe and manifold...

Hmmm... I'm hoping the bolts are just a little loose then, I recently had my uncles shopput the motor and trans in (bought it as a roller) and lets just say I'm not impressed with the quality of workthey do.

If the bolts are indeed tight do you have any hints on how to stop the leakage?

Old Jun 24, 2007 | 11:52 AM
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Default RE: exhaust leak at flange between h-pipe and manifold...

it could be a crap doughnut gasket, is it rusted or broken out?
Old Jun 24, 2007 | 11:54 AM
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Default RE: exhaust leak at flange between h-pipe and manifold...

i used rtv one time but it was just for a smog test and right after the test i cleaned it all out and went back to my catless h-pipe which fit correctly
Old Jun 24, 2007 | 01:12 PM
  #7  
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TBird232ci
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Default RE: exhaust leak at flange between h-pipe and manifold...

Copper RTV would work in a pinch, but fix it properly.
Old Jun 24, 2007 | 11:49 PM
  #8  
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Default RE: exhaust leak at flange between h-pipe and manifold...

I'm going to take it to the local shop tomorrow for new tires and a front end alignment, while its there I'll have them check out the the bolts and see if they are loose... The car has a flowmaster american thunder series cat back and would probably sound have way decent one the leak is fixed...
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