2.0 Cylinder Gaskets, Should they be used? |
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2.0 Cylinder Gaskets, Should they be used? |
jack20 |
Apr 9 2020, 12:43 PM
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#1
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Member Group: Members Posts: 406 Joined: 7-November 14 From: Granite Bay, CA Member No.: 18,099 Region Association: Northern California |
Hello,
I had leaking pushrod tube seals and dropped the engine to make the job easier. I decided to pull the heads to check condition. I’ve done quite a bit of reading about whether or not gaskets should be used between the cylinder and case and between the cylinder and head. Some posters point to a service bulletin stating not to use gaskets. I have metal spacers/gaskets between the heads and cylinders. I think this engine has been rebuilt once before I got it. It runs well but it’s not as quick as another 914 2.0 I had years ago. Maybe the other car had higher compression and no gasket? I’m wondering if this metal gasket should be there. I haven’t checked for a gasket between the cylinder and case. My 356 has a thin copper gasket between the cylinder and case. Can anyone shed some light in this? Thanks in advance, Jack |
Superhawk996 |
Apr 10 2020, 06:55 AM
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#2
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914 Guru Group: Members Posts: 5,916 Joined: 25-August 18 From: Woods of N. Idaho Member No.: 22,428 Region Association: Galt's Gulch |
I understand that the laminated metal gasket can be problematic but what is so unique about VW Type 4 heads that makes them fail? Laminated metal gasket is commonly used on water cooled engines all the time.
Maybe the fact that heads run so much hotter than a water pumper? Then I wonder, why not use a different material like copper? Norton Commando's use a copper head gasket and they are air cooled. I think some other Brit bikes used copper as well. I suspect that in the end the aluminum head is soft enough vs. the steel jug to deform and basically form it's own seal and account for a 0.0005" - 0.001" inconsistency between any of the mating surfaces. Sort of odd that air cooled 911 heads use a head seal though? Like other's I haven't used laminated gaskets but as I read this thread I'm wondering what the real development history behind it was. |
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