[20v] PB pump cyl head o-ring

[Bernie Benz]

The X cap, cylinder head, should use a generic 2-018 O-ring, ⅞“ OD x 1/16” CS. If sized right this static seal will last 5x the life of the pump, even ZF got it wrong! They sized it to fit the OD of the head but it must seal against the ID of the housing bore, so it is forced to move out, stretch with every pressurization with resulting reduction in CS. A designed in failure!  Grease it well when installing, rotating  the head, hyd fluid is not good enough. With this, just light screw driver tight is good enough.

Bernie

On May 14, 2013, at 11:53 AM, Dimitri wrote:

> What is the size/spec for the o-ring under the X-cap on the power steering pump?
> 
> Mine started leaking something fierce recently. Went from a slow weep to full blown gusher. And yes I did check to see that it was fully tighened.
> 
> Thanks.
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