 Leaking exhaust at head..., multiple copper gaskets / more muscle on those exhaust nuts |
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| Jax914 |
 Oct 8 2007, 09:57 AM
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#1
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Schwienhund Rennenmannshaft  Group: Members Posts: 138 Joined: 7-August 06 From: Jacksonville, FL Member No.: 6,602 Region Association: South East States  |
Okay,
I'm looking for some ideas.... I have a 1971 1.7 - stock heat exchangers, manta exhaust. I've replaced the copper gaskets between the heat exchanger and the head, applied what I think is way too much torque to the exhaust nuts and can't get it to stop leaking. I removed the exchanger and made sure the top of the flange is level and smooth. When I start it up and crawl under, I can feel the leak. My thoughts are to try running two gaskets?!? Anyone else have similar problems? TIA, |
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| jk76.914 |
Oct 9 2007, 05:54 PM
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Senior Member Group: Members Posts: 809 Joined: 12-April 05 From: Massachusetts Member No.: 3,925 Region Association: North East States |
Be careful on the torque. I'd say 18 ft-lbs is on the high side. It's OK for M8 steel threads in the steel nut, but the other end is steel threads in aluminum, and any torque you apply to the nut pulls on the aluminum threads in the head with the same force. M8 x 1.25 in aluminum is only good for 14 ft-lbs. I think the late VW T2 spec is 14 ft-lbs. And it's low enough that you'd better use a torque wrench or you'll overshoot. I printed this chart out and keep it in my tool box..... http://dodgeram.org/tech/specs/bolts/M_bolts.html Sorry if it's "Dodgeram". It's the clearest chart I've found. If you go to an 9mm/8mm step stud, in clean and full aluminum threads, you're probably good for the full 18 ft-lbs. Ever wonder why the 1.8L had 9/8 step studs? Or why they bothered with 8/7mm studs for the rocker pedestals? The larger aluminum threads can then match the strength of the steel on steel at the other end.... Just my engineering opinion. Your actual experience may differ. |
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Posts in this topic
Jax914 Leaking exhaust at head... Oct 8 2007, 09:57 AM
Bartlett 914 The ears on the HE pipes may be hitting the boss f... Oct 8 2007, 10:14 AM rhodyguy if you went thru the torqueing sequence and ran th... Oct 8 2007, 10:27 AM HAM Inc Because the studs are outside of the sealing flang... Oct 8 2007, 11:27 AM rhodyguy forgot to add, make SURE all the rings are out... Oct 8 2007, 11:34 AM KaptKaos I was installing mine this weekend. I just want t... Oct 8 2007, 11:38 AM
Dan (Almaden Valley)
I was installing mine this weekend. I just want ... Oct 8 2007, 11:39 AM rjames
Mind Kevin on this one!! Oct 8 2007, 08:17 PM BMartin914 Torque exhaust nuts to 18 ft/lbs. More and you ris... Oct 8 2007, 09:39 PM KaptKaos
Torque exhaust nuts to 18 ft/lbs. More and you ri... Oct 8 2007, 10:09 PM davep Len did not mention it, but he has commented in th... Oct 8 2007, 10:10 PM Cap'n Krusty Begin with the assumption that double gaskets NEVE... Oct 8 2007, 11:25 PM jk76.914 If you haven't seen this already.... I tried ... Oct 9 2007, 05:09 AM Jax914 thanks everyone....hopefully I'll have some ti... Oct 9 2007, 06:55 AM ChrisNPDrider My system for almost all repairs is to tighten, dr... Oct 9 2007, 07:20 PM Jax914 Haven't done anything yet....but to answer - y... Oct 9 2007, 08:11 PM |
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