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Crankcase pressure? 700

posted by  dlot on  Fri Feb 21 04:42 CST 2003
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last visit: Sat Nov 17 13:53 CST 2001
[RELATED]

Hi,
I have a friend with a 1988 760T. The motor runs well. He had some issues with
the dipstick blowing out of the tube. So I had him get the breather box
and the PCV system cleaned. Now this still happens. The car has about 150k miles
on the motor. My question is how does the PCV work on the 760Ti motor? The
reason I ask is because the small hose that runs to the fitting on the intake
manifold from the plastic three way connector doesn't block any boost
pressure. Isn't there supposed to be a check valve or something in this hose?
It would appear that when the motor makes boost pressure it can pressurize the
crankcase through this hose. Or does the pressurized air just get diverted to the intake air pipe? I'm willing to believe that his motor just has too much blowby but I want to be sure before we convict it and say it's a bad motor. Are there any other ways that the crankcase could be pressurized and cause this type of problem with the dipstick blowing out? Thank you for all you help
everyone.

Dave 82 242ti 280k mi.






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