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Anarchist Extremist
Join Date: Nov 2005
Location: Vermont
Posts: 419
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Leak Down, what should I look for?
I will be doing a leak down on my car tomorrow (freshly rebuilt 3k miles ago), it stil smokes intermitently that is why. 2.7CIS stock re ringed cylinders not replaced.
I am wondering what I should be looing for and what should throw a red flag. any tech articles written on this subject that anyone knows about? thanks Chris
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80 SC Coupe 00 Tundra (Tow Rig) 00 Audi A6 Avant (wifes rig) 03 Wife ('71 typ Spezial) 05 Kid (MENSA prototype) |
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11-14-2007, 07:08 AM
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Registered
Join Date: Jun 2004
Location: Rio Rancho, New Mexico
Posts: 1,325
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Do a compression check first.
It's possible the rings haven't seated. If the compression is low anywhere, spray in some oil, I use WD-40, then recheck. If the compression rises significantly after spraying oil, the problem is a worn out cylinder, or a need to run a grape hone lightly through the cylinders. If the compression is fine, likely a valve guide issue. Ask me how I know. Nikasil or Alusil?
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DOUG '76 911S 2.7, webers, solex cams, JE pistons, '74 exhaust, 23 & 28 torsion bars, 930 calipers & rotors, Hoosiers on 8's & 9's. '85 911 Carrera, stock, just painted, Orient Red |
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11-14-2007, 07:38 PM
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Anarchist Extremist
Join Date: Nov 2005
Location: Vermont
Posts: 419
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I did have the heads re-built How can I tell what the problem is?
Chris
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80 SC Coupe 00 Tundra (Tow Rig) 00 Audi A6 Avant (wifes rig) 03 Wife ('71 typ Spezial) 05 Kid (MENSA prototype) |
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11-14-2007, 07:43 PM
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Registered
Join Date: Jun 2004
Location: Rio Rancho, New Mexico
Posts: 1,325
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Chris,
"If the compression rises significantly after spraying oil, the problem is a worn out cylinder, or a need to run a grape hone lightly through the cylinders." Simply changing rings usually do not reseal properly.
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DOUG '76 911S 2.7, webers, solex cams, JE pistons, '74 exhaust, 23 & 28 torsion bars, 930 calipers & rotors, Hoosiers on 8's & 9's. '85 911 Carrera, stock, just painted, Orient Red |
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11-14-2007, 07:52 PM
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