Does anyone know of a seal kit for the power steering pump?
We have the reseal kit for $12. 928 347 921 01.
Partwerks has the kit too.
Power steering pump rebuild
This is a very good write-up originating from
Since sometimes these writeups disappear from the net I have a saved copy.
Credits go to the original author.
Now that the snow has melted I can take the car out for another drive and see what else needs to be done. My main concern was the power steering pump since it sounded like it was starting to go... which after 30 years isn't actually all that bad.
Warning- you will need to be either some sort of god or Chuck Norris in order to do this without a vice and some clamps
Here's the rebuild kit purchased for $20 from 928s Rus,
They were extremely helpful and even sent me a video on how to rebuild it
Step 1- take steroids and attempt to remove the pulley nut
Step 2- Get the bracket off by unscrewing 2 bolts
Step 3- take more steroids and remove the snap ring by pushing the rear cover
Step 4- After the rear cover pops out, gently remove the pump shaft and
internals... without having them grenade allover your workspace
Spring, rear cover, and more internals
Step 5- Install new o-rings and seals, make sure to coat them with ATF or
power steering fluid before putting them in
Step 6- Remove the old shaft grommet and install the new one provided. The
fit was tight so the rubber mallet came in handy.
Step 7- Putting the puzzle back together. Pretty much just put them back the
way they came
piece by piece
Step 8- Putting the snap ring back in. This was actually pretty easy since
the clamp does all the work.
Step 9- Once the snap ring is installed its just a matter of putting
everything back where it came from and your power steering pump should be as
good as new.
***torque spec for the pulley bolt is 36ft/lbs
These are pictures of a BMW ZF steering pump which is pretty similar to the one used in the 928.
The repair kit for a pump up to 1984 is different:
The power steering pump consists of a rotary part with little aluminum plates
lodged in slits. It has minimal wear. Due to rotation and centrigugal force the
plates are pressed to the outside and thus move the steering fluid (ATF) in one
If taking apart, be aware that these plates will drop out.
The steering pump 928 347 089 01 was introduced in model 1985, had different size and opperated at 75 bar.
The change to 100 Bar took place in model year 1991 and with this the steering rack was also modified. (Don't know exactly what changed there). Funny thing is taht PET does not show the change in pump pressure. The part numbers remained unchanged.