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Oil Overfill Produces Positive Crankcase Pressure??

Help, Advice and DIY Tutorials on Volvo's extremely popular car line -- Volvo's 1990s "bread and butter" cars -- powered by the ubiquitous and durable Volvo inline 5-cylinder engine.

1992 - 1997 850, including 850 R, 850 T-5R, 850 T-5, 850 GLT
1997 - 2000 S70, S70 AWD
1997 - 2000 V70, V70 AWD
1997 - 2000 V70-XC
1997 - 2004 C70

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andyleonard
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Joined: 12 Jan 2009, 19:50
Year and Model: 1997 850 GLT, 2005 X
Location: 90290

Oil Overfill Produces Positive Crankcase Pressure??

Post by andyleonard »

OK. My son had a 90K complete-head-rebuild on a 97 850; all vacuum stuff, codes, new PCV, hoses, belts, everything, done at head-off. Car was excellent, CA smogged, no codes, no issues. He drove to Seattle from L.A., no issues. Drove around Seattle for a year, no issues. In prep for a Seattle-L.A. run it got overfilled by - we're guessing - 1/2 quart due to a sloped driveway.

Car ran fine Seattle to L.A., BUT oil dripped from full plug well - leaking from new oil fill cap - onto exhaust manifold and SMOKED. Oil overfill was corrected, head cleaned up and no more smoke, BUT now crankcase has positive pressure.

Question: Is the new PCV stuff damaged? Can something be drained? Did a hose blow off something?

I'm on an island, he's in Boston, car's in L.A.

Thoughts? And thank you.

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abscate
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Post by abscate »

An overfill won’t cause crankcase pressure. Probably a hose loose somewhere in the system, or you Have reached the six month end of life of aftermarket rubber.
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erikv11
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Post by erikv11 »

abscate wrote: 06 Jul 2022, 01:35 An overfill won’t cause crankcase pressure. Probably a hose loose somewhere in the system, or you Have reached the six month end of life of aftermarket rubber.
Such wisdom. What he said.
'95 854 T-5R, Motronic 4.4, 185k
'96 855 NA, 147k
'98 V70, T5 tune-injectors-turbo, LPT engine, 294k
'06 S60 R, 172k
'07 XC70, 189k
'99 Camry V6 :shock: 138k
gone: '96 NA 850 210k, '98 NA V70 182k, '98 S70 NA 225k

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