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Should crankcase really have negative pressure? 200 1989

posted by  lrisius on  Sun Mar 14 00:13 CST 2004
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last visit: Sun Aug 17 05:59 CST 2014
[RELATED]

Hi,
I've got an 89 and 90 240, both with about 145,000 miles. When I check crankcase pressure at the filler cap, they both seem to either be neutral or have slight positive pressure, and definitely not a negative pressure. Best I can tell, my flame trap circuitry is all clean and working, including the small vaccum hose. I seem to be forcing a little oil out around the fill cap and maybe at some seals.
Should I truly have noticeable negative pressure?
Thanks!
Lyle






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