[urq] Mixing Pentosine and ATF

[Renneisen, Eric 475]

Claus wrote:
> I want to use the pump used to pentosine with red ATF on the Urq.
(part of 
> an ANN transplant)
> Will the seals in the pump leak ? And are the pressure different.?

The issue won't be the fluid.  The urq stuff is all quite capable of
running with Pentosin.  In fact, the current parts fiche gives the
G002000 P/N for these older systems.  I wouldn't use ATF with any of the
newer stuff, but Pentosin is fine for everything.  Since you mention
ATF, I presume you have a WR or WX model which uses a single-circuit
vane pump.  The MB and RR have two-circuit (tandem) pumps.  In the older
system, the pump's single output is sent to the valve body/bomb unit,
which regulates pressure sent to both the steering and the brake assist.
The tandem pump has two outputs--one for the bomb/brakes and one for the
steering.

To use the newer pump, I think you'd need to change the rest of the
hydraulics.  The newer steering racks probably run at a higher pressure
which your original rack might not survive, though I don't know for
sure.  You've also got the bomb/valve body with the output to the rack
that becomes redundant.

I presume you meant to type AAN instead of ANN (which is a 75 hp Golf
engine).  If the pump you're thinking of using is the one from the AAN,
I definitely would not use it.  The AAN was used in the larger C4
chassis, and their steering systems run at even higher pressures (one
reason they tend to leak more).  You did ask specifically about the pump
used on the S2 (ADU), so that one should be fine, assuming you get the
rest of the hydraulic parts.

Eric R.
'86 urq
'93 S4


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