Merc crankcase pressure

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Sat 17 Feb 2001 20:42
Merc crankcase pressure - Gary Smith
I've been looking at several used 230 TE's ( 90 - 140 k ) and all have enough crankcase pressure/ cylinder blowby to chuff oil out of the filler ( small amounts ). The 6 cylinder ones I've seen don't seem to have the same trait.

Q. Is this a normal occurance with the 4 cylinders of this age or signs of serious wear?
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Sat 17 Feb 2001 20:59
RE: Merc crankcase pressure - steve paterson
I'm not familiar with Merc engines, but all engines have a breather system which enables normal crankcase compression to be relieved unnoticably.
Should the filters in the system become blocked, internal pressure will result in oil being blown out of the filler cap. When the filler cap is a tight fit, oil will be forced out of oil seals.
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