Why is there an oily residue around the oil filler cap as if it is being forced out?
Nov 23, 2011, 07:47 PM
#1
Why is there an oily residue around the oil filler cap as if it is being forced out?
Why is there an oily residue around the oil filler cap as if it is being forced out under boost? It seems to be only around this area. Could this be blow-by? If so, it doesn't come through the port in the valve cover that I have vented to the atmosphere...the one that used to be connected to the intake tract. The car is a OEM longblock car with FP4Rs, an HTA35R on E85 running 30psi. I checked the OEM PCV valve & it seems to be in working order...only allowing vacuum though but not boost. When the car idles at operating temp it pulls about 35 cm/hg of vacuum...isn't that indicative of a healthy motor? I have NEVER had the dipstick pop out. I hope this isn't excessive blow-by.
ANYONE with ANY type of useful info, please chime in. Thanks.
ANYONE with ANY type of useful info, please chime in. Thanks.
Nov 24, 2011, 11:34 AM
#2
Why is there an oily residue around the oil filler cap as if it is being forced out under boost? It seems to be only around this area. Could this be blow-by? If so, it doesn't come through the port in the valve cover that I have vented to the atmosphere...the one that used to be connected to the intake tract. The car is a OEM longblock car with FP4Rs, an HTA35R on E85 running 30psi. I checked the OEM PCV valve & it seems to be in working order...only allowing vacuum though but not boost. When the car idles at operating temp it pulls about 35 cm/hg of vacuum...isn't that indicative of a healthy motor? I have NEVER had the dipstick pop out. I hope this isn't excessive blow-by.
ANYONE with ANY type of useful info, please chime in. Thanks.
ANYONE with ANY type of useful info, please chime in. Thanks.
Nov 24, 2011, 06:01 PM
#4
TommiM: Yeah. I think I need to do a catch can & eliminate the PCV. I hope that fixes it. After doing some research, I think that the amount of vacuum being generated at idle with the FP4R's is indicative of a healthy motor. I hope that fixes the prob!
Nov 25, 2011, 06:52 AM
#5
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The gasket around the oil cap is failing, or you have a bit too much crank case pressure. If it is pressure int he crank case, it's a good idea to take care of it in case it blows your dipstick out and makes a giant mess instead of just a little bit around the filler cap. If your PCV valve fails (leaks) it's a mad boost leak, but does it pressurize the crank case much if you have the driver's side breather port unblocked?
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