[s-cars] More - Help with Pressure testing

[Dave Forgie]

S-gruppees:  Fred Munro has given me an idea why I may not have been able to
pressurize my intake hoses (and intercooler) even with the cam cover vent line
and the ISV line plugged (but noting at the throttle body).  He is suggesting
the turbo seal (see below).  Whats my problem, Dude(s)!?

Dave F.

Fred Munro wrote:

> Hiya Dave;
>
> The air is going past the turbo cold side seal, down the turbo oil return
> tube and into the oil pan, hence the smell of oil and the pressure at the
> cam cover spigot. Is this a problem? Couldn't tell you. My UrS4 did it when
> I tried this test (I had the throttle body hose plugged) and although I
> polled the list, I never did find out what kind of a seal is in the turbo
> i.e. should it hold air pressure without oil pressure behind it or shouldn't
> it.
> You may be able to pressurize the system ( and the entire engine) by leaving
> the cam breather hose connected - I didn't bother, I bought Samco hoses
> instead :o)
> I'd suggest polling the list to see if others can get the system to hold
> pressure with the cam cover breather hose removed and plugged. If they can,
> maybe both our turbo seals are pooched :o(
>
> Fred Munro
> '94 S4