HELP hydraulic pump

[Richard Hoffman]

Having BTDT with my 90 CQ 20 pump and dinking around with various other
pumps at the junkyard, I Do believe the 10v and 20v pumps are different.
The Bentley has different instructions for both of them as well so I would
recommend just ordering up the rebuild kit for the correct pump.
For the most part, the rebuild was very simple.  Take the pump apart and
clean everything.  Re-install in reverse order of removal, using Pentosin to
lubricate all the gaskets you install.  The "plus-shaped" plugs require a
"drag-link socket" because (at least in my case) even with my largest
screwdriver I could not get enough torque to loosen them.
When faced with the prospect of replacing the pump ($400 for rebuilt unit)
or rebuilding the pump ($60) I think that the cost of the seal kit is 100%
worth it.... Oh, and even in my novice hands, the pump is 100% function and
has no leaks after 5k miles, so everything looks good so far :)

Richard
1990 CQ 204K


>From: Kneale Brownson <knotnook at traverse.com>
>To: <david at mountaindome.com>, quattro at audifans.com
>CC: 20v at audifans.com
>Subject: Re: HELP hydraulic pump
>Date: Mon, 15 Jul 2002 18:07:32 -0400
>
>--
>At 11:50 AM 07/15/2002 -0700, David Manz wrote:
>
> >I had a problem with my brakes and power steering. I traced it back to
>the
> >hydraulic pump. There is a definite leak from the top of the pump.
> >Underneath a "plus" shaped screw cap is a seal that must be leaking.
> >Anyway, a few other listers said that a rebuild kit for the hydraulic
>pump
> >from a 1991 200 would do the job. I looked into it and the 20v and 10v
> >have different kits. Which one to use? So then I called the dealer, and
> >low and behold, they actually have a kit for my 1990 90 20v, at double
>the
> >price. So then I called a local parts place and they found a kit for a
> >plane jane 1990 90. My question is: Does anyone have experience
> >rebuiliding hydraulic pumps. More specifically 90 20v pumps. If so which
> >kit should i use? I really appreciate any advice. I was all set to order
> >the kit today but now I am quite confused.
>
>I'm pretty certain all those ZF pumps are the same, David, as long as
>you're talking about cars from 1987 on.  The same kit should serve any of
>them.  The main differences I've found ('87 5ktq, '91 200q20v and '90 V8)
>is the bracket system specific to each model.  The brackets all vary, but
>the pumps fit into them the same.
>
>There's a good write-up on pump resealing in the Bentley for the '91
>200q20v.
>--




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