hyd pump cap seals

[Greg-List at attbi.com]

Had the same problem just a week ago.  However I was using O-Rings that
I purchased from a hydraulic shop, supposedly high quality.  I had to
eventually spring the $35 for the Audi O-ring seal kit.  Havent had a
problem since, they must be proprietary O-Rings.  Also use that O-Ring
lube and you shouldnt have a problem.  The O-Rings that blew out even
spit right down the middle, I'm not sure what the Audi O-rings are made
of, but they are much stronger.  Good Luck..

Greg Bird
Portland, Oregon
90 200tq

Steve Hackett wrote:

>[ Converted text/html to text/plain ]
>At 11:26 AM 4/16/2003 -0700, you wrote:
>
>>From my exp, most likely the O-rings were not properly lubed upon
>installation, causing unequal stretch and deflection of the ring as the
>cylinder head was screwed into place.  Grease well!  NEVER hold the rack
>against the end stops!
>Bernie,
>
>Thanks for the reply.  To add more detail :
>first seal blew a few months ago(during cold weather), this was the original
>pump - 100k+ miles.
>second seal blew within 10 seconds, this pump was removed from a car only
>because of some minor leaking but worked good.
>third seal blew again within 10 seconds, this pump was a ZF reman unit.
>All 3 times, steering was working OK.
>I've never had this problem and haven't heard of it, leaking seals - yes - but
>not blowing out explosively from under the cap.
>Any input is greatly appreciated, I'll post results of findings as I go.
>Steve Hackett
>
>
>
>>From: Steve Hackett <sbhack at ntplx.net>
>>Date: Wed, 16 Apr 2003 13:19:00 -0400
>>To: 200q20v at audifans.com
>>Subject: hyd pump cap seals
>>
>>Have had 3 cap orings blow out in a row (3 different pumps - last one was a
>>reman), sometimes sounds like a firecracker.  Suspect blockage
>>somewhere.  Steering is OK but brake pedal seemed hard before
>>shutdown.  Any BTDT experience ?  Thought the pumps had relief valves in
>>them - guess not.
>>Planning on cleaning and checking all lines and banjo bolts.
>>
>>TIA,
>>Steve Hackett
>>
>>
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>>
>
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