[s-cars] Help with Pressure testing

[Fred Munro]

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(

Let me know what you find, Dave!

Fred Munro
'94 S4



-----Original Message-----
From: s-car-list-admin at audifans.com
[mailto:s-car-list-admin at audifans.com]On Behalf Of Dave Forgie
Sent: November 23, 2002 5:13 PM
To: s-cars
Subject: [s-cars] Help with Pressure testing


S-gruppees:  It finally stopped raining here in Vancouver and the sun
came out (after it burned off the fog).  I decided to pass on lawn
mowing and finally pressure test the intake hoses on my 93 S4.  I built
an inlet hose plug from a suitably sized tin can and a Shrader
(Shroeder?) air valve.  I knew that I had to plug the cam cover breather
so I removed the hose from the cover (at the front of the engine) and
used a champagne cork (and the gear clamp) to plug the hose..  Started
Test No. 1 - couldn't get any pressure but smelled oil.  Put finger over
the metal cam cover breather tube.  Slight pressure.  Decide that I need
to plug something else.  Figure its the bottom hose on the idle
stabilizer valve (ISV).  Remove and plug hose with a wine cork (and the
gear clamp). (Note: all corks were previously used and not fresh from
the bottle).  Test No. 2-  nothing.  Not a sausage (as the Brits say).
I either have a problem with my test apparatus (I am going to find a
plastic plug for the big end) OR, more likely, I am doing something
wrong.  Do I need to also remove the hose from the throttle body and
plug it?? I had assumed that there was no overlap on the cam lobes and
all cylinders were "sealed".  Seems like this could be my mistake.  Any
BTDT's (where is the tech FAQ on this??)???  Help!  (Please).

Dave F.

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