 got a vac. leak, could it be.. |
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| toon1 |
 Mar 28 2006, 11:08 AM
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#1
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Senior Member  Group: Members Posts: 1,849 Joined: 29-October 05 From: tracy,ca Member No.: 5,022  |
I have a vac leak at the runner/ head union. I have replaced the gasket with a new, thick paper gasket. I surfaced the face of the runner where it mates with the gasket with some wet sand paper and a peice of granite tile.
Put it all back together very clean and with a little gasketsinch. When I fired the motor up it was fine. But yesterday after my drive home from work I noticed a fluctuating idle, sprayed some carb cleaner in that area on the rpm went up. Is it possible the runner has a crack?? |
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| Bleyseng |
Mar 28 2006, 11:35 AM
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#2
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Aircooled Baby! Group: Members Posts: 13,034 Joined: 27-December 02 From: Seattle, Washington (for now) Member No.: 24 Region Association: Pacific Northwest |
No, but I bet your fuel injector inner seals are shot.... (IMG:http://www.914world.com/bbs2/html/emoticons/wink.gif)
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| toon1 |
Mar 28 2006, 11:53 AM
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#3
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Senior Member Group: Members Posts: 1,849 Joined: 29-October 05 From: tracy,ca Member No.: 5,022 |
is it the seal that is on the end of the injejtor that makes the seal agains the runner? that is new. Is there an injector seal internally? |
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| Rand |
Mar 28 2006, 12:04 PM
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#4
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Cross Member Group: Members Posts: 7,409 Joined: 8-February 05 From: OR Member No.: 3,573 Region Association: None |
If I understand which one you're talking about, the correct gasket is a lot thicker than paper... (IMG:http://www.pelicanparts.com/catalog/images/fuel_injection/914_intake_manifold_gaskets.JPG) The injectors seals are like little rubber donuts that fit around the injector... (IMG:http://www.pelicanparts.com/catalog/images/fuel_injection/914_injector_seals.JPG) |
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| toon1 |
Mar 28 2006, 12:53 PM
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#5
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Senior Member Group: Members Posts: 1,849 Joined: 29-October 05 From: tracy,ca Member No.: 5,022 |
Yep, both are new, the manifold gasket is new with the thicker paper, the injetor seals are new on the all 4 injectors, big and small seals are new. This is the second new man. gasket on this side that is why I am suspect of something else. The manifold gasket on the drivers side of the motor is the thin paper type gasket and it is sealing fine. |
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| ClayPerrine |
Mar 28 2006, 12:58 PM
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#6
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Life's been good to me so far..... Group: Admin Posts: 15,430 Joined: 11-September 03 From: Hurst, TX. Member No.: 1,143 Region Association: NineFourteenerVille 
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The manifold gaskets are not just paper. They are a plastic insulator between 2 paper gaskets.
You need the proper spacer with the gaskets. It won't run right with just a paper gasket. |
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| toon1 |
Mar 28 2006, 01:09 PM
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#7
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Senior Member Group: Members Posts: 1,849 Joined: 29-October 05 From: tracy,ca Member No.: 5,022 |
I have the bakelite piece in. It is brand new, never used, paper is bonded to the bakelite, it's all good. after two new gaskets, I think it is some thing that I am putting back on or the head is warped??? (IMG:http://www.914world.com/bbs2/html/emoticons/unsure.gif) |
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| Bleyseng |
Mar 28 2006, 01:15 PM
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#8
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Aircooled Baby! Group: Members Posts: 13,034 Joined: 27-December 02 From: Seattle, Washington (for now) Member No.: 24 Region Association: Pacific Northwest |
Well, I have seen the engine tin stick out into where the Phenolic block mounts to the head preventing a solid seal. Check for that.... (IMG:http://www.914world.com/bbs2/html/emoticons/unsure.gif)
(IMG:http://www.914world.com/bbs2/html/emoticons/jsharp.gif) |
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| toon1 |
Mar 28 2006, 01:34 PM
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#9
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Senior Member Group: Members Posts: 1,849 Joined: 29-October 05 From: tracy,ca Member No.: 5,022 |
good point, I had that problem on the other side and corrected it before installing the gasket. This side is clear of the tin. |
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| Bleyseng |
Mar 28 2006, 01:58 PM
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#10
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Aircooled Baby! Group: Members Posts: 13,034 Joined: 27-December 02 From: Seattle, Washington (for now) Member No.: 24 Region Association: Pacific Northwest |
try a different gasket compound like Copper or Curel to seal it.
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| toon1 |
Mar 28 2006, 02:03 PM
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#11
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Senior Member Group: Members Posts: 1,849 Joined: 29-October 05 From: tracy,ca Member No.: 5,022 |
ok! what is copper and curel?? sealants? NAPA auto?? |
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| Bleyseng |
Mar 28 2006, 02:26 PM
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#12
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Aircooled Baby! Group: Members Posts: 13,034 Joined: 27-December 02 From: Seattle, Washington (for now) Member No.: 24 Region Association: Pacific Northwest |
sealants...
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| toon1 |
Mar 28 2006, 02:30 PM
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#13
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Senior Member Group: Members Posts: 1,849 Joined: 29-October 05 From: tracy,ca Member No.: 5,022 |
how do they differ from gasketsinch?? |
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