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 |
Cap'n Krusty |
Sep 17 2010, 02:17 PM
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#2
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Cap'n Krusty Group: Members Posts: 10,794 Joined: 24-June 04 From: Santa Maria, CA Member No.: 2,246 Region Association: Central California |
I agree with Dave (realred). It would be well for everyone to remember that the original Porsche exhaust nuts, both the style used on the 1.7/1.8 cars, and the one specifically for the 2.0 cars, are NOT lock nuts, and were cad plated. All were heli-coiled. Any discussion involving the copper plated lock nuts should take into consideration they're NOT the same. They require different torque on installation because you have to overcome the locking force. The plating changes the effort, as well. I use a little anti-seize on any exhaust fastener, giving it just a little extra torque to compensate for the lessening of the friction.
If I can reuse the original nuts, or dig into the stash of used ones, I do. The Cap'n |
mgphoto |
Sep 17 2010, 04:59 PM
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#3
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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 agree with Dave (realred). It would be well for everyone to remember that the original Porsche exhaust nuts, both the style used on the 1.7/1.8 cars, and the one specifically for the 2.0 cars, are NOT lock nuts, and were cad plated. All were heli-coiled. Any discussion involving the copper plated lock nuts should take into consideration they're NOT the same. They require different torque on installation because you have to overcome the locking force. The plating changes the effort, as well. I use a little anti-seize on any exhaust fastener, giving it just a little extra torque to compensate for the lessening of the friction. If I can reuse the original nuts, or dig into the stash of used ones, I do. The Cap'n I can say I had fewer problems when I switched to 2.0L fastener. Thanks for your input Cap, seems I, like politics, am one nut short of a quorum! |
Cap'n Krusty |
Sep 18 2010, 07:58 AM
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#4
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Cap'n Krusty Group: Members Posts: 10,794 Joined: 24-June 04 From: Santa Maria, CA Member No.: 2,246 Region Association: Central California |
I agree with Dave (realred). It would be well for everyone to remember that the original Porsche exhaust nuts, both the style used on the 1.7/1.8 cars, and the one specifically for the 2.0 cars, are NOT lock nuts, and were cad plated. All were heli-coiled. Any discussion involving the copper plated lock nuts should take into consideration they're NOT the same. They require different torque on installation because you have to overcome the locking force. The plating changes the effort, as well. I use a little anti-seize on any exhaust fastener, giving it just a little extra torque to compensate for the lessening of the friction. If I can reuse the original nuts, or dig into the stash of used ones, I do. The Cap'n I can say I had fewer problems when I switched to 2.0L fastener. Thanks for your input Cap, seems I, like politics, am one nut short of a quorum! It appears I may have a spare one. Since you may not be here for the open house at my shop and GPR (foolish move, that!), maybe someone can pick it up for you. Free will donations accepted. Where are you located? |
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