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 |
HAM Inc |
Apr 9 2020, 04:19 PM
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#2
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Senior Member Group: Members Posts: 846 Joined: 24-July 06 From: Watkinsville,GA Member No.: 6,499 Region Association: None |
Leave out the headgaskets.
They are made of laminated steel. Over time many will delaminate. This leads to the gaskets getting sucked in, as BD reported. I have seen countless T4 heads over the years, Bus and 914, that did this and the leak was ignored long enough to burn a trough in the head you could stick a finger in. This almost always ruins the jug, too. Lapping is not needed if the surface finish of the heads is smooth. Lapping doesn't hurt anything if it's done very carefully with fine grit compound, but the idea of lapping originated in the days of the proliferation of bolt on flycutter's, which in good hands did a fine job, but in the typical hands out there left chatter marks or streaks. These imperfections needed to be lapped down. Heads that leave our shop do not need to be lapped and we advise our customers not to. |
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