Exhaust leak at nut

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jonathan
Posts: 29
Joined: Mon Jan 14, 2019 2:51 pm
First Name: jonathan
Last Name: Delancey
Location: Easton PA

Exhaust leak at nut

Post by jonathan » Sun Aug 23, 2020 4:12 pm

Noticed today that exhaust is coming out from under the nut ( between the pipe and nut ) that connects the manifold to the pipe. The nut is tight. What can I do?


Adam
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First Name: Adam
Last Name: Doleshal
Location: Wisconsin
MTFCA Number: 23809
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Board Member Since: 2000

Re: Exhaust leak at nut

Post by Adam » Sun Aug 23, 2020 4:37 pm

There are some repro brass nuts that have been available off and on over the years that aren’t quite machined just right. The threads and/or clearance inside isn’t quite deep enough and the pipe flange doesn’t get tight against the manifold.

If this is the case, you need a better quality exhaust nut.


Topic author
jonathan
Posts: 29
Joined: Mon Jan 14, 2019 2:51 pm
First Name: jonathan
Last Name: Delancey
Location: Easton PA

Re: Exhaust leak at nut

Post by jonathan » Sun Aug 23, 2020 5:15 pm

It turns out the flare at the end of the pipe was broken off! Ordered a new pipe from Lang’s.


Allan
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Location: Gawler, Australia

Re: Exhaust leak at nut

Post by Allan » Sun Aug 23, 2020 9:08 pm

Jonathan, that sometimes happens when the flange does not contact the manifold correctly, and the nut is done up tightly to close the gap. This puts stress on both the pipe flange and the manifold. The flange needs to sit neatly on the manifold before the nut is done up.

Allan from down under


Robert Kiefaber
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Joined: Tue Mar 05, 2019 3:38 pm
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Last Name: Kiefaber
Location: Indiana

Re: Exhaust leak at nut

Post by Robert Kiefaber » Mon Aug 24, 2020 2:07 am

I use 0000 steel wool as packing inside nut. Seals very well.

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