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Just took apart two of the stock A4 bypass valves. Neither ripped, but one soaked in oil.

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Old 08-05-2002, 05:41 PM
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Default Just took apart two of the stock A4 bypass valves. Neither ripped, but one soaked in oil.

The valves are very easy to take a part, just use a pair of dikes to snip the overlapped seam where the two halves of the valve are sonic-welded.

One valve was off my car, not chipped. From what I can decipher, based on the accumulation of dust on the valves - my valve having more dust on it since I replaced it over a year ago - my valve was pretty much bone dry inside. No rips could be found.

The other valve, off a chipped car (name is not mentioned for obvious reasons), did have oil in it. Had less dust on it, so I am guessing this is the case. I also didn't recall seeing oil on my valve when I pulled it out, but did see it on this one when I pulled it out. There's actually a good layer of oil inside the valve. I could probably tip the valve upside down and it would run out of the valve if left overnight.

Sorry, no pictures...

So - anyone have any ideas on why a car running more boost might show more oil in the bypass valve? I recall a similar debate on oil being present in the tt bpv's about a year ago actually. All those that have recently upgraded to TT bpv's should take apart their old ones and check it out - report your findings.
Old 08-05-2002, 05:55 PM
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Slow day at work Scott?
Old 08-05-2002, 05:55 PM
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Default Actually a busy one. I just ripped them apart 5 minutes ago.

Only took 2 or 3 minutes... was curious.

Get quotes yet?
Old 08-05-2002, 05:57 PM
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Quotes on your **** to come hopefully this week
Old 08-05-2002, 07:40 PM
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Default I just replaced my stock BPV over the weekend...

01.5 w/ 30K stock miles.

I was also a bit suprised when I saw how oily it was, although I didn't take it completely apart (looking around with a flash light).

BTW, I replaced it with the TT BPV.


Kind Regards
Old 08-05-2002, 10:38 PM
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Mine was perfectly clean -- no oil, no dust.
Old 08-06-2002, 04:31 AM
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Mine too. The dust I was referring to was on the outside.
Old 08-06-2002, 07:02 AM
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Oh. Well in that case, it was covered in dust just like the rest of my components
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Quick Reply: Just took apart two of the stock A4 bypass valves. Neither ripped, but one soaked in oil.



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