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Re:crankcase pressure (1 viewing) (1) Guest
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TOPIC: Re:crankcase pressure
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crankcase pressure 3 Months, 3 Weeks ago
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I recently helped a buddy replace the head gasket in his '86 with a '84 engine. It runs like a champ...except oil starts spitting out of the oil separator(?) when we remove the oil filler cap the pressure goes away. Is the this a vacuum problem? how can we get the pressure to regulate?
We want to get this car to Thunderhill in a month for the NASA event. Any advice/ideas are appreciated.
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Jeremy Mathews
NorCal 944
#07
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Re:crankcase pressure 3 Months, 3 Weeks ago
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Is there a vacuum line diagram online? I looked at Bills 944 world...but nothing. They have them for turbos, but not N/A.
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Jeremy Mathews
NorCal 944
#07
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SvoChuck (Moderator)
Moderator
Posts: 387
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Re:crankcase pressure 3 Months, 3 Weeks ago
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I have never seen one spit oil up from the separator . could that be an issue with blow by (ie rings are bad) ?
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Re:crankcase pressure 3 Months, 3 Weeks ago
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I hate to think negative, but I assume you did a leakdown compression test after the hg install?
it could be a bad piston or ring, warped head or faulty head gasket causing blow-by in the crankcase.
You could test the PCV and such, but since you already had headgasket problems I'd eliminate the obvious first.
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Re:crankcase pressure 3 Months, 3 Weeks ago
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It could be bad rings pressurizing the crank case. It could also be a problem in vacuum lines.
There is a silver sticker on the pass side inner fender that show the the vacuum routing.
If it is not there you will need to look it up. I don't have a copy handy.
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Joe Paluch
944 Spec #94 Gina Marie Paper Designs
Arizona Regional 944 Spec Director, National Rules Coordinator
2006 Az Champion - 944 Spec Racer Since 2002
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rlofgren (User)
Junior Boarder
Posts: 37
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Re:crankcase pressure 3 Months, 3 Weeks ago
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is that the same diagnosis when the dipstick pops out due to crankcase pressure? and shouldn't the excess pressure be routed back to the airbox(intake)?
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Last Edit: 2008/07/29 18:33 By rlofgren.
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Spec-944 #30 Norcal
1990 944 S2 street
2003 Mini Cooper S
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