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Re: '87 5k Turbo trouble :-{ (long)

.7 boost is not "that much" the car should have no problem handling
You can take your turbo to a rebuild shop, it is not all that big a deal, if
you are close to MPLS (MN), I know of a good turbo shop, very reasonable and
good prices, they could probably do it mail order too.......
let me know.....
-----Original Message-----
From: Max <mpalmars@axxsys.com>
To: audi <quattro@coimbra.ans.net>
Date: Saturday, February 28, 1998 5:27 PM
Subject: '87 5k Turbo trouble :-{ (long)

>Just finished taking apart upper engine in my '87 5kcst in order to deal
>with what seems to be a blown head.  After inspecting my turbine I have
>found out that there is quite a lot of play in the bearing (also might
>account for why I have been seeing oil in the IC hoses).  My Hanes
>manual says take turbo to dealer.  Is it a big deal to replace the
>bearing?  Also I noticed that it looks like the turbine has been ported
>on the compression side (I knew that the previous owner had put a
>performance chip in it) which helps explain the tremendous power the car
>used to have.  The car has a VDO cockpit mounted turbo boost gauge
>(shows 0 when digital is at 1) and according to that the boost before
>the head problem was between 1.7 and 1.8 (0.7 and 0.8 on the gauge).
>when I first got the car and gave it full throttle the analog gauge
>would boost to about 1.2 and then go crazy, at which point it would
>almost rip the wheel out of my hands.  This eventually lead to the sub
>frame bolts, going through the rear bushings, got ripped out by the
>force.  This has not been the case for the past year as I have
>experienced a dramatic loss of power from previous levels.  So now I
>want it back.
>As I have all the turbo, waste gate, injection, and so on, out of the
>car, I would like to get some input as to what I should be doing to
>recondition these parts.  Now I don't want to go out and buy new high
>performance gadgets, but rather make sure all the current components are
>working.  This would include fixing the turbine (it is not stuck, rolls
>freely in boost direction, but is stiff and crunchy in the reverse
>direction, plus there is about 2-3 millimeter play in the shaft). How do
>I inspect and possibly improve the waste gate? How can I inspect the
>fuel injection and valves.
>As I already mentioned in a previous post there was a crack in the EM
>and when I removed it from the head I noticed another small one above
>the turbo output, along whit two cracks inside.  All look like they can
>be welded to me, but I don't know if it would hold up. Is there one way
>of doing this that is better than others? Like maybe argon.
>On Monday I am taking the head to the machine shop, it actually doesn't
>look bad, has two small cracks between valve seats, but both are under
>0.5 mm in width.
>MAX  :-(