[200q20v] Re: [200q20v]PS pump rebuild, was: steering wheel "pulses" at low speeds

[Bernie Benz]

Hi Peter,

I don't consider myself an expert on these pumps, but do have some
experience.  External leaks are usually the O-ring seals under the
cylinder heads, and easy fix.  I had a problem on my old 5KTQ that
was leaking at the split line between the rear and center section.
I could not seal this problem with repeated  0-ring replacements in
this area.  Turned out that it had an internal wear problem in the
pressure relief valve, and so I had to replace with a rebuilt one.

Bentley has a good description of the PS pressure test and resealing in
Section 48.  In your case, I suspect that your pump will not meet the
pressure test, in which case they say to replace the pump.  Before
doing so, if you are so inclined, you could remove the pressure relief
valve and see if you can find out why it is leaking or relieving at
too low a pressure.  If the shaft seal is not leaking, don't
mess with it.  So, you need not buy a resealing kit, as I have the
O-ring part numbers which you can purchase from a local bearing house
much cheaper.

Regards,  Bernie


> From: Peter Schulz <peschulz at cisco.com>
> Date: Fri, 09 Nov 2001 11:32:15 -0500
> To: Bernie Benz <b.m.benz at prodigy.net>
> Subject: Re: [200q20v] more info, was: steering wheel "pulses" at low speeds
>
> Bernie:
>
> Never having opened or rebuilt a pump of this type, I defer to you
> experience...
>
> Is the check valve issue something that the Lemforder seal kit would address
> (rebuild the pump at home)
>
> Or is this a wear issue,  requiring replacement?
>
> (I know can't tell without opening the pump  ;^)
>
> Peter
> At 11:29 PM 11/8/2001 -0800, you wrote:
>> Hi Peter,
>>
>> Contrary to other opinions, IMO, the hi press hose, stock or made up, will
>> not cause the symptoms that you state.
>>
>> I suspect that you have a failing pump, one or more of the six piston check
>> valves has failed or is not sealing, an internal leakage problem.  The
>> resultant low and pulsating pump output volume would account for your low
>> speed problems.
>>
>> Bernie
>>> From: Peter Schulz <peschulz at cisco.com>
>>> Date: Thu, 08 Nov 2001 13:56:16 -0500
>>> To: 200q20v <200q20v at audifans.com>, quattro at audifans.com
>>> Subject: [200q20v] more info, was: steering wheel "pulses" at low speeds
>>>
>>> A bit more info....
>>>
>>> I've had the car for three years...and the previous owner replaced the hi
>>> pressure hose.
>>>
>>> The fact that this has started in the last 2 months has me stumped.
>>>
>>> Peter
>>>
>>> At 01:17 PM 11/8/2001 -0500, Peter Schulz wrote:
>>>> Got a Q for the brain trust...
>>>>
>>>> 1991 200 20v TQW wagon #1 sometimes has little power steering assist
>> at low
>>>> speeds (I can sometimes hear groaning) and requires lots of strength.
>>>>
>>>> At low speeds, I can feel "pulsing" in the steering while driving...NOT
>>>> braking.
>>>>
>>>> It almost feels as if the pump belt is slipping, but revving the engine
>>>> does not increase the assist, and a check of the belt shows that it is
>> snug.
>>>>
>>>> The reservoir has plenty of Pentosin 11, the High Pressure hose from the
>>>> pump to the rack was replaced by the previous owner, accumulator was
>>>> replaced a year ago, and the pump shows no signs of leaking.
>>>>
>>>> ideas?
>>>>
>>>> TIA!
>>>>
>>>> -Peter
>>>>
>>>> Peter Schulz
>>>> 1990 CQ
>>>> 1991 200 20v TQW indigo mica
>>>> 1991 200 20v TQW titanium grey
>>>> Chelmsford, MA USA
>>>> peschulz at cisco.com
>>>>
>>>> _______________________________________________
>>>> 200q20v mailing list
>>>> 200q20v at audifans.com
>>>> http://www.audifans.com/mailman/listinfo/200q20v
>>>
>>> _______________________________________________
>>> 200q20v mailing list
>>> 200q20v at audifans.com
>>> http://www.audifans.com/mailman/listinfo/200q20v
>>
>> _______________________________________________
>> 200q20v mailing list
>> 200q20v at audifans.com
>> http://www.audifans.com/mailman/listinfo/200q20v
>
> Peter Schulz
> 1990 CQ
> 1991 200 20v TQW indigo mica
> 1991 200 20v TQW titanium grey
> Chelmsford, MA USA
> peschulz at cisco.com
>