Chasing Exhaust Leaks, This is maddening, so many issues. |
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Chasing Exhaust Leaks, This is maddening, so many issues. |
ctc911ctc |
Apr 7 2020, 02:56 PM
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#1
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Senior Member Group: Members Posts: 914 Joined: 9-June 18 From: boston Member No.: 22,206 Region Association: North East States |
All,
'74 914, 2L, original engine - about 20K miles I started a new thread because the ones I could find did not address this issue. Perhaps it is me???? Last month I purchased new gaskets (thanks Mark @914R) and annealed them as per instructions. Used super glue to stick them in place. Mounted the heat exchanger/manifold and locked them in with around 20lbs of torque. Copper goo on the nuts, etc. When I started the car it was the sound of my youth - smooth, strong,,,,,,ahh After a few days the sound changed, using a rubber tube held to my ear I found exhaust leaks in the junction to the muffler (used new gaskets, alum sandwiched ones). Here are the leaks Copper Gasket Leaks Seems as if the nuts were not tight enough. I made certain that the edge of the pipes were square and both on the same plane. Questions as to the copper gaskets: 1. Seems that one was not seated concentrically with the pipe, that exhaust was leaking from day one - is there a method to square this or center it? 2. the other gasket it seems did not get seated at all, so it seems as if it was concentric just not tight enough????? Now the aluminum Gaskets I really tightened the bolts, I have ordered new gaskets and am brushing smooth the flanges which were both kind of cruddy, any advice as to installing these? THANK YOU TEENERS! |
ctc911ctc |
Apr 7 2020, 03:48 PM
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#2
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Senior Member Group: Members Posts: 914 Joined: 9-June 18 From: boston Member No.: 22,206 Region Association: North East States |
Certainly, someone has come up with a sure-fire 100% good-guy guaranteed method for tightening and securing this assembly? Anyone? Anyone?
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BeatNavy |
Apr 7 2020, 04:11 PM
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#3
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Certified Professional Scapegoat Group: Members Posts: 2,933 Joined: 26-February 14 From: Easton, MD Member No.: 17,042 Region Association: MidAtlantic Region |
Certainly, someone has come up with a sure-fire 100% good-guy guaranteed method for tightening and securing this assembly? Anyone? Anyone? No, but there are some things that help. Filing the HE's so they are the same height can help. IMO, most important to seal at the head, then get the muffler to tight to the HE's. Torque the HE's slowly to exhaust studs and leave the muffler somewhat loose at first. Try to verify that you can see gasket on each side of the HE as you tighten to head. Once you think you have it, lightly torque the muffler to the HE. Then check the seal by using a shop vac set to blow, instead of suck, and put it on the exhaust outlet. Feel around the bottom of the head to see which, if any, of the mating surfaces may not be seated, and adjust everything as needed. Remember not to overtighten! Drive around a couple of times, then check the torque on everything again. Others will have other, probably better, ideas. |
914_teener |
Apr 8 2020, 10:38 PM
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#4
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914 Guru Group: Members Posts: 5,245 Joined: 31-August 08 From: So. Cal Member No.: 9,489 Region Association: Southern California |
Certainly, someone has come up with a sure-fire 100% good-guy guaranteed method for tightening and securing this assembly? Anyone? Anyone? No, but there are some things that help. Filing the HE's so they are the same height can help. IMO, most important to seal at the head, then get the muffler to tight to the HE's. Torque the HE's slowly to exhaust studs and leave the muffler somewhat loose at first. Try to verify that you can see gasket on each side of the HE as you tighten to head. Once you think you have it, lightly torque the muffler to the HE. Then check the seal by using a shop vac set to blow, instead of suck, and put it on the exhaust outlet. Feel around the bottom of the head to see which, if any, of the mating surfaces may not be seated, and adjust everything as needed. Remember not to overtighten! Drive around a couple of times, then check the torque on everything again. Others will have other, probably better, ideas. No...no better ideas. How the heck are you Rob....waiting for this thong to blow over? |
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