RWD - Crank Case Pressure

Volvo RWD 700 Forum

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Crank Case Pressure 700

Hi everyone, having a problem with my PCV system. Opening the oil fill cap results in air pumping out. I hooked up a low pressure gauge at the dipstick tube. At idle there is basically no vacuum or pressure ( less than + 1/2 inches of water or .018 psi) Giving a little gas but not yet getting into boost I saw up to around +5 inches of water or .18 psi.

Posted a similar thread on turbobricks but would like any help that I can get.

Some relevant information:
Stock 1988 745 turbo, ~250,000 miles, max boost at 10psi, b230ft engine. Compression check around 30k miles ago showed 15-25 psi increase wet versus dry on a warm motor. Replaced breather box/oil separator ~30,000 miles ago, running synthetic oil for the last ~10,000 miles.

Also recently set up a catch can set up as follows. Two 15mm lines coming off the stock breather box and one 15mm hose off of where the block mount distributor plug is -> to the catch can -> 15mm hose going from the catch can to the pre turbo intake hose and small vacuum line to intake manifold.

I will be checking for blockage in the breather box drain hose as a possible cause.
Could a blocked turbo oil drain also increase crank case pressure?
Or does the above sound like I have too much blowby due to piston rings?

Thanks for any help/ideas and sorry for the long post.


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New Crank Case Pressure [700]
posted by  Moustacio  on Sat Jul 22 12:01 CST 2017 >

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