Hydraulic Pump Question

[Kneale Brownson]

No,  you must remove the pump to get to all the mushroom caps and to 
separate the pump halves to get to the internal O-rings.  You COULD 
replace the O-rings under the top caps in place, but if one is leaking, 
the others probably will follow suit soon.  And the internal rings will 
be failing shortly after that.  If you don't have any kind of visible 
leak from the nose and the pump isn't sucking air past the shaft seal 
(no bubbles in the reservoir while running), you don't need to replace 
that seal.

On 10/11/2011 8:51 AM, Marc Boucher wrote:
> Fantastic!  From the looks of it, can be done with the pump in place, no need to remove pump from car?
>
> On 2011-10-11, at 9:31 AM, Kneale Brownson<kneale at knitknacks.com>  wrote:
>
>> Pump resealing is described best in the Bentley for '89-91 100&  200 models.  I copied and scanned the pages covering the pump and you can see them starting at<   http://www.pbase.com/kneale_brownson/image/114727641>   and clicking on the "next" button four times.  They're not as clear as in the book itself.
>>
>> You can get the seal kit for around $6/7  from  Autohausaz.com
>>
>> On 10/10/2011 11:05 PM, Marc Boucher wrote:
>>> The hydraulic pump on my 1990 Audi 100 has developed a worsening leak.  It went from requiring topping up occasionally to its current state where it will go from the max to the min within 200 miles.
>>>
>>> There does not appear to be any leak in any of the hoses, the reservoir, or the steering rack.  The leak appears to be isolated to one point in the pump:  A ring of metal about the size of a quarter that sits on the outside of the pump.  There are bubbles of the green hydraulic fluid coming from the space between the metal ring and the body of the pump.
>>>
>>> There are at least 2-3 of those metal rings.  They have groves perpendicular to each other almost as though they could be pulled or tightened by a large Phillips screwdriver.
>>>
>>> Are there any simple options for fixing this, or does it generally require replacement of the pump.
>>>
>>> Thanks,
>>>
>>> MC
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>>>
>>>
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>