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Re: Crankcase neg. pressure question (archive)
[ Follow Ups ] [ 7-series (E32) Message Board ] [ Msg. Board FAQ ]
Posted by Morty K on November 19, 2001 at 07:06:40:

In Reply to: Crankcase neg. pressure question posted by Rich 1990 750iL on November 18, 2001 at 22:27:27:


I've read on the board many times about negative crankcase pressure. You should have a little difficulty taking off the oil cap when the engine running, or the engine should run poorly with the cap off. I experience nothing like that. The cap comes off easily with the engine running and the engine runs fine.

I'm burning a quart of oil every 1200-1300 miles. What does this sound like? Crankcase ventilation valves? Is it an easy DIYer, and do you replace or clean them? TIA.


The volume control valves are about $28 each from the dealer and the check valves are about $12 each. You can probably clean the the check valves. It is no a difficult job. I would suggest replacing the grommets (about $2 each) that hold the volume control valves in the valve cover. If you replace them remove the throttle control motors. The rest will be easy.
Morty K.

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