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+--- Thread: power steering pump (/showthread.php?tid=1087)
power steering pump - oel_brenner - 01-29-2010
so driving my W107 around, and ever since the engine swap
the steering had always felt "light" and sometimes "nervous"
and I chalked it up to several things, which I have systematically ruled out:
steering damper
control arm bushings
subframe bushings
tie rods
and all the other bits that wear out.
all the while not much improvement..
then I looked at the power steering pump
the unit attached to the OM603 is stamped 85bar
and the one that was on the gasser V8 that came out
was stamped 65bar.
I am sure there is a pressure adjustment somewhere, but doubt
I am going to be able to adjust it down that far.
I was thinking of teeing off the HP side, and leak off some pressure back to the return side with a valve/regulator and see if that helps...
something like this ?
http://www.grainger.com/Grainger/items/1A042?Pid=search
thoughts ?
RE: power steering pump - SurfRodder - 01-30-2010
8 GPM is probably a little excessive, even turned down that valve may be too 'big'... it wouldn't take much to bleed that much pressure off the pump. The things I'd consider are: will the pump be 'overworked' with this mod? Do you also plan on installing a gage to verify what it is set at? How does the load on the system change as the wheels are turned? (you can prolly get it dialed in, but when you add load to the pump it'll likely get thrown outta whack)
It would be fun to try out, but at ~60 bux may be a little excessive for a 'cheap' solution. Why not get the proper pump? Are the brackets different?
RE: power steering pump - ForcedInduction - 01-30-2010
The manual says "c) If the pump does not attain the specified pressure, check volume control valve and pressure relief valve and replace, if required." This is for the 617, but I'd bet the 603 has something similar.
RE: power steering pump - oel_brenner - 01-30-2010
Im probably going to put a gauge on first to understand the pressure profile
a) under 0 load
b) turning wheels
c) turning against the stop (full lock)
then mess around with the pump adjustment screw(s) and see what happens
and finally install a bleed valve of some sort ( they have smaller ones )
problems with the original pump:
completely different design (bracket etc.)
I would have to swap the pulley to multirib (assuming it would even fit without mods)
then make custom mounting bracket placing the original pulley
attached to the old pump in the correct position so I can run the stock length belt
( that last one is probably just anal.. but..)
RE: power steering pump - SurfRodder - 02-03-2010
well... sounds like you've got a good plan of attack...
I'd be willing to try to swap the pulleys(I'd bet they'd swap over), but having to get a bracket just right is not something I'd have the time for either...