Crankcase vent valve
#2
#3
AudiWorld Senior Member
I replaced mine after a few honks.
Tried cleaning the Vaico with cleaner and it still honked. Cleaned the original and it is working perfectly.
Used a little Berryman Chemtool to cut the sludge in both.
#4
AudiWorld Super User
Same here. I replaced my original for no reason other than age and the replacement lasted only a few months before becoming noisy. I cleaned my original and reinstalled. No issues after that.
#5
AudiWorld Senior Member
I replaced mine mostly due to age, and I thought it was the source of a noise I was hearing in that area. Opted to go with OEM after reading some posts about aftermarket ones failing. Boy, those sure are expensive.
#6
AudiWorld Super User
So summing up, you get what you pay for... The usual Audi refrain. It is the world's most expensive PCV valve, in classic over engineered Audi form. But as the replies drive home, the aftermarket substitute was wasted money longer term.
Fortunately W12's didn't have these. They went with pricier oil separators now commonly found with FSI generation set ups. Those don't seem to have issues on the W12's (some on S8's though), but the plastic connector lines associated with these are what cost you on the W12's as they accumulated ten years of oil vapor and heat soaking.
Fortunately W12's didn't have these. They went with pricier oil separators now commonly found with FSI generation set ups. Those don't seem to have issues on the W12's (some on S8's though), but the plastic connector lines associated with these are what cost you on the W12's as they accumulated ten years of oil vapor and heat soaking.
Last edited by MP4.2+6.0; 08-18-2016 at 07:55 PM.
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#8
The PCV valve contains a metal spring and a plastic diaphragm (that's it!) Eventually oil gunk will cause the diaphragm to stick shut. So unless the diaphragm is torn, all you need to do is separate the two halves, soak everything in odorless mineral spirits and then clean with q-tips.
#9
AudiWorld Super User
The PCV valve contains a metal spring and a plastic diaphragm (that's it!) Eventually oil gunk will cause the diaphragm to stick shut. So unless the diaphragm is torn, all you need to do is separate the two halves, soak everything in odorless mineral spirits and then clean with q-tips.
#10
You have to be really careful doing that as most brake cleaner solvents are acetone and will dissolve just about any plastic and paint. I wouldn't use that stuff anywhere near a car, including the brakes!
Last edited by jandreas; 08-20-2016 at 04:44 PM.