Copper nuts, exhaust leaks! |
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Copper nuts, exhaust leaks! |
mgphoto |
Sep 16 2010, 09:06 PM
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#1
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"If there is a mistake it will find me" Group: Members Posts: 1,339 Joined: 1-April 09 From: Los Angeles, CA Member No.: 10,225 Region Association: Southern California |
Hello,
I am having a problem with exhaust leaks, I am, for the first time using copper nuts as opposed to the steel with insert and flange Porsche part # 039.256.297 see photo below. I would still be using these if I hadn't lost one, and Porsche says these are NLA. The procedure I would use, after replacing the copper seals, I would use Never Seez on the studs and torque the steel nuts to 16 ft-lbs. I am not sure if I should use Never Seez with the copper nuts and I am not sure the torque is correct for these fasteners, as they are oval shaped and seem tighter to start with? Any experience with this would be very helpful. Thanks, Mike |
mgphoto |
Sep 20 2010, 10:39 AM
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#2
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"If there is a mistake it will find me" Group: Members Posts: 1,339 Joined: 1-April 09 From: Los Angeles, CA Member No.: 10,225 Region Association: Southern California |
I got it to work by using a 10mm x 1.25 helicoil and than inserting a 8mm x 1.25 helicoil, not very parallel with the other stud but it works!
Here is a photo of the nuts, all of the copper nuts were loose except for the one that broke the stud. I included a stainless steel bolt that I had to grind off because it galled after a week on the car. A. copper nuts, one broken stud. Nuts had more resistance going on than the torque necessary to compress the copper gaskets. B. Stainless steel bolt and nut used for attachment of heat exchanger to muffler, galled and locked solid. C. A copper covered split lock nut I have used in the past and was not happy with. D. original 1.7 exhaust nut with helicoil (38 years old) The copper gaskets I took out look almost untouched, I am sure I could use 3 of them again! |
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