home register FAQ memberlist calendar

Go Back   Turbobricks Forums > Mechanical > maintenance & nonperformance

Thread Tools Display Modes
Old 07-30-2007, 03:46 PM   #1
Board Member
Join Date: Nov 2002
Location: Los Angeles, CA
Question PCV on 94 940 turbo (too much oil pressure)


Does anyone know the most likely cause of too much oil pressure on a 1994 940 turbo wagon? I'm guessing something in the PCV system is blocked, and causing the oil pressure to be elevated, which is forcing some oil past certain seals.

Where should I look to solve this? All advice is greatly appreciated!


taloyd is offline   Reply With Quote
Old 07-30-2007, 04:23 PM   #2
mr.volvo's Avatar
Join Date: Dec 2006
Location: Building new Race Cars
Default crankcase pressure too high.

hi. you are on the right track, but its not actually oil pressure, so much as crankcase pressure. as pcv is an acronym for positive crankcase ventilation, as you can imagine, when the pcv becomes blocked or restricted, the crankcase pressure rises, and the end result is oil blowing out past seals, from around the oil cap, anywhere it can escape. eventually, you could have seals popping out, this happens if it becomes completely blocked, and driven without getting it fixed. you dont want to blow a seal.

to repair this, on a 940 turbo, is pretty simple. on the intake manifold, between #3 and 4 cylinder runners, is a little white sort of tee shaped connection pipe. this is partly where the problem lies. there is a hose coming over from the turbo area going to the top of it, and a short hose on the bottom, going down to the oil trap box. there is a small vaccum hose coming from the vaccum port, going to a brass nipple on the intake manifold. replace the white plastic pipe, (or clean it completely out, most especially the vaccum port...this is critical) replace the length of small vaccum hose, and again..extremely critical: remove and clean out the brass vaccum nipple from the intake manifold! if there is no vaccum to the pcv fitting, the whole effort is wasted.

its not too hard to do all this, and it will cure your excessive crankcase pressure situation. also a good idea to go ahead and replace the oil filler cap seal while you're in there. good luck with it, post back if you have any trouble.
mr.volvo is offline   Reply With Quote
Old 08-08-2007, 12:28 PM   #3
Board Member
Join Date: Nov 2002
Location: Los Angeles, CA
Default thank you!!!

mr. volvo,

That was EXACTLY it! Thank you so much for helping out with this problem!


taloyd is offline   Reply With Quote

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On

Forum Jump

All times are GMT -4. The time now is 05:43 AM.

Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2018, vBulletin Solutions Inc.