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VALVE COVER GROMMET LEAKS

EOLIVER

Well-known member
Joined
Dec 14, 2003
Messages
116
Location
SAN DIEGO, CA
Corvette
1989 DARK BLU METALIC SIX SPEED CONV
I have a 1989 Corvette Conv and I recently repalced the valve cover grommets on both sides but on the dirver side cover ther still appears to be a small leak from the PVC vavle grommet. Could this be a blowby situation or could exhaust back pressure cause this? When I purchase corvettes, I usually have the exhaust checked for back pressure, but have not got around to it. The motor just turned over 90K and I think its to soon for a blow by (worn rings) Interested in hearing advice on how to seal the grommets.
 

G Winter

Well-known member
Joined
Aug 21, 2004
Messages
2,177
Location
NW Iowa
Corvette
1990 red convert 6 sp
Are you sure the PCV valve is working ?

Glenn
:w
 

EOLIVER

Well-known member
Joined
Dec 14, 2003
Messages
116
Location
SAN DIEGO, CA
Corvette
1989 DARK BLU METALIC SIX SPEED CONV
Yes both the grommet and PCV valve are brand new.
 

EOLIVER

Well-known member
Joined
Dec 14, 2003
Messages
116
Location
SAN DIEGO, CA
Corvette
1989 DARK BLU METALIC SIX SPEED CONV
I should also say I don't know the history on the engine. It has an adjustable fuel pressure regualator and aftermarket ACCEL fuel injectors.
 
W

WNH

Guest
Maybe the grommet isn't the right size.
Did you buy it 'specifically' for your C4 from a Corvette parts supplier, or did you get it from an auto parts store ?

The auto parts stores have grommets that look the same, but are really different sizes.

[Just my .02]
 

RV Guy

Well-known member
Joined
Aug 16, 2003
Messages
190
Location
Nampa, ID
Corvette
1986 Silver/Gray Coupe
I have a 1989 Corvette Conv and I recently repalced the valve cover grommets on both sides but on the dirver side cover ther still appears to be a small leak from the PVC vavle grommet. Could this be a blowby situation or could exhaust back pressure cause this? When I purchase corvettes, I usually have the exhaust checked for back pressure, but have not got around to it. The motor just turned over 90K and I think its to soon for a blow by (worn rings) Interested in hearing advice on how to seal the grommets.

Did you find your problem? I need to replace my valve cover grommets also on my '86. It only has 65,000 on it and runs great but I am getting leakage around both grommets and the oil fill cap. I don't know wether to just go to the auto parts store or look somewhere else. I don't see any listed in Mid America's or Corvette Central's catalogs.

Thanks.
 

RV Guy

Well-known member
Joined
Aug 16, 2003
Messages
190
Location
Nampa, ID
Corvette
1986 Silver/Gray Coupe
Did you find your problem? I need to replace my valve cover grommets also on my '86. It only has 65,000 on it and runs great but I am getting leakage around both grommets and the oil fill cap. I don't know wether to just go to the auto parts store or look somewhere else. I don't see any listed in Mid America's or Corvette Central's catalogs.

Thanks.

I just found them listed in Corvette Central. Is there really any difference between these and the ones at the corner parts store?

Thanks.
 
G

grapeknutz

Guest
Do a leak down test on the engine! It sounds as you have excessive blow by past the rings. That can force oil leaks.
 

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