Question about 1996 Volvo 850

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Oil leaks 160 k on a 2.4l fi. there seams to be alot of oil blowby from the filler cap, is there a pcv valve on this thing? thanks, adam in r.i.

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Http://www.volvoforumsrepairs.org.uk/800Repairs/inmanpcv.htm look at all your hoses i changed all mine for 4mm silicon hose and found some split /blocked that fixed the back pressure problem dont drill your cap that aint going to fix it it just lets oil run every where .

Posted on Oct 06, 2008

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I haven't fixed it, yet, but i will. i don't want to pay or join or anything, i'll just ask someone else. thanks anyway

Posted on Aug 02, 2008

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DRILL A HOLE IN THE OIL CAP AND ATTACH A HOSE AND RUN IT UNDER THE CAR AND IT ACTS AS A BREATHER I DID AND IT WORKS GREAT

Posted on Sep 22, 2008

  • fluebag Jul 30, 2014

    you need to clean the crankcase breather its in 2 parts 1 behind the manifold big job but most times its the filter its attached to the crankase breather where it runs into the air intake at the throttle valve its got a small vac.hose on it and a large hose with a wire filter inside you give it half a turn and it comes out its always glogged solid you can clean it with solvent or buy a new one it fixes the problem most times

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3 Answers

Pcv valve I changed the head gasket in my 2002 Nissan Altima 2.5s and did a oil change and I had the oil filler cap off when I started it and it oil came out the filler


Oil supply to the overhead camshaft and valve gear is fairly vigorous and so some spray from there is to be expected without the filler cap.

Unlikely a problem with the pcv valve - they rarely give trouble unless seriously gummed up with carbon-type deposits and then a thorough clean mostly restores them.

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It's most likely due to a clogged PCV valve or clogged/kinked PCV hose. I'll include a video showing PCV system operation.
I've seen this symptom many times on various engines, and the PCV valve was usually clogged/defective. A clogged PCV valve results in crankcase pressure build-up and fumes/oil exiting places on the engine that it shouldn't. A severely clogged PCV often makes oil leak/exit out of the dipstick, even with dipstick in place.
The good news is... if the PCV valve is clogged/defective, the "cure" is a very cheap fix. Usually less than $5.
PCV stands for Positive Crankcase Ventilation, btw.

But note that on some engines (those where the oil filler opening is directly above the rocker arms/valvetrain) it is normal to have a small amount of oil "spray" come out, as the rocker arms are dispersing oil thru their oil passage hole on top.

(Whenever posting vehicle questions, always please add the engine size/type. It helps in more accurate diagnosis.)
Also, please rate via the helpful button if you feel my answer helped you out. Also post back and let me know if this cured it.

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