[Es2] project update...

[Dave K.]

Damn Ben, are you having fun yet?
I would not think this would cause your oil foaming problem but I have not
studied the oil system.  I did not get a lot of oil out of my turbo when I
removed it off of a running car.
Dave

----- Original Message ----- 
From: "Ben Klumper" <bklumper at mdbworld.com>
To: "eS2 List" <es2 at audifans.com>
Sent: Sunday, February 08, 2004 9:39 PM
Subject: [Es2] project update...


As most of you know, I'm near the end of my e//S2 conversion but have been
struggling to try to solve a foaming oil problem of late. Today I replaced
the 1.8 bar oil pressure sender, de-skinning every one of my knuckles in the
process. Also removed and inspected the oil pressure relief valve, which
looked fine and wasn't seized or installed incorrectly.
I then started taking a closer look at the turbo, pulling off the intake
hose from the cold side. To my surprise, the turbo does not spin freely by
hand. It turns, but does not spin. I can turn it with one finger on the
blades, but there's resistance there. Aren't turbos supposed to spin freely?
There is zero end-to-end or side-to-side play in the shaft. I first noticed
this condition when I tore the engine down and rebuilt it. But I figured
that it was a little tight because it hadn't had oil in it for a couple of
years. However, now that the engine has run and oil has (presumably)
circulated, one would think that the turbo bearings would be lubricated
enough to spin freely. Could this resistance be blocking the flow of oil
into and out of the turbo? Could this be causing the foaming oil in the oil
pan? My gut feeling says yes. So I spent the rest of my day removing the
turbo (I love undoing what took hours to do) so I could open it up and see
if I can see a blockage of some sort. I also noticed when I was removing the
turbo that there was less than about 1/4 teaspoon of oil that came out of
the turbo and it's oil feed and return lines, which I found to be quite
strange. The 1.5 liters of coolant that spewed out of the coolant return
line more than made up for it though. Makes for a nice, greasy garage floor.
Anyway, what do you guys think? Does this sound plausible?
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