machinists - valve stem seal question/help
07-07-2003, 11:54 AM
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Car: Z28
Engine: L98
Transmission: T56
machinists - valve stem seal question/help
Can anyone tell me if this looks normal, or abnormal? And/Or what type of valve stem seal this is, and/or if it's good quality or junk?
Last edited by 91L98Z28; 07-07-2003 at 11:59 AM.
07-07-2003, 03:33 PM
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Engine: 6
Transmission: 5
Looks relatively normal.
It's a "positive" type seal, not sure of the brand. Probably OK for at least a little while.
The spring around it keeps tension on it, so it doesn't depend so much on the elasticity of the rubber material.
Looks like there's more writing on it, or maybe a logo; show more of it, maybe we can figure out better what it is.
It's a "positive" type seal, not sure of the brand. Probably OK for at least a little while.
The spring around it keeps tension on it, so it doesn't depend so much on the elasticity of the rubber material.
Looks like there's more writing on it, or maybe a logo; show more of it, maybe we can figure out better what it is.
Last edited by RB83L69; 07-07-2003 at 03:36 PM.
07-07-2003, 07:36 PM
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best i have of the other marking.
When you say relatively normal, what's that mean? These things have 500 miles on them since they were brand new. Are the "gaps" in the spring normal?
When you say relatively normal, what's that mean? These things have 500 miles on them since they were brand new. Are the "gaps" in the spring normal?
07-07-2003, 08:29 PM
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Yes, likely F-M; that would be a decent quality piece, the "National Seal" brand I believe.
The gaps in the spring don't matter. As long as it holds the seal against the valve, all is well.
The gaps in the spring don't matter. As long as it holds the seal against the valve, all is well.
07-07-2003, 08:46 PM
#6
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Huh, neat. My F.M. positive retention valve seals look nothing like that. Mine use a band of metal, rather than a spring, and are blue.
Must be different part numbers.
FYI, if you don't trust the ones you have now (not that you have any reason to not trust them) I picked mine up for about $10 USD for a set of 8. Comes with those little rubber o-rings!
Must be different part numbers.
FYI, if you don't trust the ones you have now (not that you have any reason to not trust them) I picked mine up for about $10 USD for a set of 8. Comes with those little rubber o-rings!
07-08-2003, 05:50 AM
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Originally posted by NTChrist
Huh, neat. My F.M. positive retention valve seals look nothing like that. Mine use a band of metal, rather than a spring, and are blue.
Must be different part numbers.
Huh, neat. My F.M. positive retention valve seals look nothing like that. Mine use a band of metal, rather than a spring, and are blue.
Must be different part numbers.
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07-08-2003, 11:19 AM
#8
And remember that the exhaust stem seals are a different material (and marking) from the intake stem seals. Intake seals don't last very long on the exhaust side (don't ask - but what a pain if you make the same mistake I did).
A complete new set of 0.562" positive stem seals (12511890 Valve Stem Seal Kit) is about $18 US from GM. I'm not sure what that translates to in California dollars...
A complete new set of 0.562" positive stem seals (12511890 Valve Stem Seal Kit) is about $18 US from GM. I'm not sure what that translates to in California dollars...
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