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  • December 10, 2019, 01:51:13 PM

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Author Topic: Manifold to Header Pipe Exhaust Leak.  (Read 2543 times)

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Offline kevindpm61

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Manifold to Header Pipe Exhaust Leak.
« on: May 02, 2016, 12:41:46 PM »
My son's SX'4 had an exhaust leak from the manifold to header pipe that was present after initial cold start-up. I finally was able to remove the nuts and take off the header pipe. The pipe mounting surface looks good. The exhaust manifold doesn't need a separate donut as it has the concave mounting surface. Anything that I can do to improve sealing when I bolt it back together? I was thinking about applying some Copper RTV around the exhaust pipe flange. Not sure if it would hold up in this application.
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Offline kevindpm61

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Re: Manifold to Header Pipe Exhaust Leak.
« Reply #1 on: May 03, 2016, 08:09:29 AM »
I've decided to not use high temp RTV for reassembly. Did some research on the web and spoke with the folks at Wurth. I think that I'm going to give their exhaust assembly paste a try. The rep that I spoke with said that it was a perfect application for this job. I'll report back once the car is up and running.

http://www.shopwurthusa.com/wurthstorefront/Chemical-Product/Miscellaneous/Exhaust-Assembly-Paste-4-94-Fl-Oz-Tube/p/0890100045#
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Offline vangremlin

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Re: Manifold to Header Pipe Exhaust Leak.
« Reply #2 on: May 03, 2016, 05:16:24 PM »
Good luck!  I'm interested to hear how the paste works.  When I first got my car running, I had an exhaust leak at the same spot.  Turned out the first shop just did a poor job of getting the nuts tightened on there good.  Second shop had it fixed in no time.
1981 Kammback 258 - "Pepe"
1980 Coupe 258 - "Ginger
1972 Gremlin X 304
1978 Gremlin 4 cyl 121 - sold
1964 TBird 390 - sold

Offline Draekon

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Re: Manifold to Header Pipe Exhaust Leak.
« Reply #3 on: May 03, 2016, 06:01:17 PM »
The link states that the paste becomes metal hard and seal permanently. I'd be worried about not being able to separate the exhaust after using that stuff.

Offline kevindpm61

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Re: Manifold to Header Pipe Exhaust Leak.
« Reply #4 on: May 03, 2016, 06:37:20 PM »
I asked the manufacturer about whether the parts could be taken apart and if the sealant could be removed if necessary. I was told that parts can be removed. and that it can be removed using a grinding stone or flap wheel.
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