[s-cars] S6 crankcase pressure

[Theodore Chen]

so what's the current list wisdom on how to pressure-test the intake tract?  should the turbo be included in the test?  what size plugs are used for the various pieces and what did you use for plugs?

i have an O2 adaptation field (block 9, group 000) that is reading 66, below the normal range of 100-141.  among other things, bentley says to check for leaks between the turbo and the throttle body.

i have samco hoses installed everywhere.  does it still make sense for me to pressure-test the system or should i look elsewhere first?


----- Original Message ----
From: "djdawson2 at aol.com" <djdawson2 at aol.com>
To: dgraber460 at aol.com; S-CAR-List at audifans.com
Sent: Wednesday, June 25, 2008 8:52:16 AM
Subject: Re: [s-cars] S6 crankcase pressure


Your crankcase should not be pressurized during normal running.? During a pressure test, however, it will pressurize causing the oil cap wheezing and potentially blowing out your dipstick.? Any time an intake valve is open, this will eventually pressurize the case.



Attached is a drawing of the crankcase ventilating setup...

Dave


-----Original Message-----
From: dgraber460 at aol.com
To: S-CAR-List at audifans.com
Sent: Wed, 25 Jun 2008 6:47 am
Subject: [s-cars] S6 crankcase pressure




On the AAN engines, should (or shouldn't)?there be a check valve somewhere to 
keep the valve cover and crankcase from seeing full boost?
Thinking I might have boost leak I pressure tested the system and the oil filler 
cap whistled like hell with only 10 PSI applied. I am getting a strong whistle 
during shifts and full boost, so I know I'm loosing pressure somewhere, and it 
seems to be the oil filler cap. Car runs fine and pulls strong, I just don't 
want to blow all my gaskets.
TIA


Dennis Graber
Quality Linings & Painting
Denver, CO
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