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940 crankcase pressure 900 1992

posted by  Jim Holst on  Mon Aug 4 06:37 CST 2003
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last visit: Tue Jan 4 11:05 CST 2011
[RELATED]

You may not have a problem. Even with the PCV system operating well, there will be oil splashed up into the oil filler cap. I've had this seep out even with a new gasket on the cap and the system working fine.

Your engine has the lightweight oil filler cap so the "jiggle test" doesn't work as well. That is the test where you turn the oil filler cap to the open position but leave it sitting in the opening. Then, if the running engine has positive pressure in the crankcase, the cap will jiggle around due to this pressure. If the crankcase pressure is negative, as it should be, the cap will be sucked down and remain steady. You can sort of do this on your engine by loosening the cap on a running engine and try to feel if the cap is being pushed out (bad) or sucked down (good). I've also done this with my hand over the open oil filler hole. Try these tests and see you can learn.






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