how do you change power steering pump still inside engine bay? got most of the bolts out but still one that is in the back of pump. if i can manage to get to that bolt should pump pull out? pics would be nice thks.

 

Did you remove the alternator to get access?

 

no just removed all bolt that are excessable from front of engine

 

You really need to get the alternator out of the way to do this. The pressure hose is nearly impossible to get off with the alternator in place. There also may be a bolt on the rear of the pump, not positive about that on S4s.

 

Yes do more work to do less work Get the alternator out of the way !

 

Some of the following may help.

Porsche 928 Power Steering Pump Removal and Reconditioning – 1990 S4

The following is a summary of how I went about removing, reconditioning and reinstalling the power steering pump on my 1990 Porsche 928 S4.

1. Purchase reconditioning kit. I bought mine from www.rennbay.com.
2. Download the ‘how to recondition the pump’ video from the same rennbay site, and review.
3. Purchase new Dextron III power steering fluid (about 1 litre max.).
4. Take note of radio station settings.
5. Disconnect battery.
6. Fit front bodywork protectors and syphon PS fluid out of reservoir.
7. Raise car on hoist.
8. Remove engine undertray
9. To remove alternator:
a. Slide the cool air intake hose off the alternator
b. Loosen alternator belt (13 mm lock nut and bolt)
c. Loosen main alternator bracket bolt (17 mm)
d. Swing alternator to loosen and remove belt
e. Hang belt away from the job, but so that it can be reinstalled in same direction of rotation
f. Remove the nut from the back of the alternator tensioning bracket (17 mm) and remove this, the bolt and the attached 13 mm bolt and lock nut.
g. Using a ratchet, start undoing the 17 mm alternator bolt. This can be done without removing the lower radiator hose.
h. If the fan shroud prevents this bolt from coming all the way out, you will need to slightly raise the fan shroud. To do this, remove the two bolts that hold the radiator and the fan shroud together at the top of the radiator, and gently raise the plastic shroud a little (1/2” / 10-15mm).
i. Have a helper ready to support the alternator, and a length of wire (coat hanger) to hand the alternator from the car so that it is not hanging from the electrical wires.
j. Keep undoing the 17mm bolt, remove it, gently lower alternator, reinstall bolt in the alternator, wind coat hanger wire around bolt and hang from underbody. Ensure electrical connector wires are not under tension.
10. You will now have access to the power steering pump.
11. To remove power steering pump:
a. Undo the two power steering line ‘banjo’ bolts. Be careful not to lose the two washers that go on each side of each banjo bolt (four washers in all). Use a funnel and container to catch any fluid that runs out of these hoses.
b. Loosen, but do not remove, the three 13mm bolts that hold the power steering pump to the power steering mounting bracket.
c. Release the belt tension by undoing the 13 mm lock nut on the tension fitting and undoing the tensioning bolt several turns.
d. Remove belt from power steering pulley (leave attached at crank end)
e. The power steering pump should now be quite loose
f. Reach up and unclip the power steering reservoir hose from the wire ‘fork’ that is mounted at the top of the PS pump
g. Now remove the bracket that the power steering pump is still (loosely) bolted to, by undoing one 17 mm bolts and two unequal length 13 mm bolts.
h. The power steering pump and mounting bracket can now be removed from the vehicle.
12. Undo the three already lose 13 mm bolts that hold the pump to the mounting bracket, and separate
13. Thoroughly clean the exterior of the pump and mounting bracket. Note which way the wire bracket is attached, and where.
14. To recondition the pump, follow the instructions on the Rennbay video.

Reinstalling is the reverse of the removal, with the following notes:

15. Attach the reconditioned pump to the mounting bracket before fitting the bracket to the engine, and temporarily gently tighten the three 13 mm bolts so that the pump is as close ‘in’ as possible
16. When lifting the attached pump and mounting bracket into position, slip the power steering belt over the power steering pump pulley as part of this fitting process – it can be very difficult to get the belt over the pulley after the power steering bracket is mounted
17. Also fit the power steering pump reservoir pipe into the wire bracket attached to the top of the power steering pump before tightening all mounting bolts
18. Once the power steering bracket is properly mounted and tightened, the power steering belt properly tensioned, and the power steering pump properly tightened to the mounting bracket tightened, make sure that the wire bracket that holds the power steering reservoir pipe in place is clear of the inner guard and that the hose is clear of the engine.
19. Check that all power steering related fittings are tight – very hard to do once the alternator is in place.
20. Tighten all nuts and bolts, making sure that power steering belt and alternator belt tensions are correct.
21. If previously unfastened, refasten fan shroud and turn fan blades by hand to ensure there is no interference.
22. Reconnect battery.
23. Add new Dextron III fluid to power steering reservoir.
24. To bleed air out of the system, start engine and gently move the steering from lock to lock. Do not use ‘hard lock’ until all air has been bled out of the system. When all air has been bled, there should be no bubbles or froth inside the power steering reservoir. And no ‘moaning noise’ either!
25. Check for leaks, top up reservoir.
26. Test drive, recheck for leaks.
27. Reset radio.
28. Refit engine under tray.

Cheers,
Dave O
90 S4

 

Right click and choose "save target as."
http://www.rennbay.com/images/vid/pu...tall_small.wmv

I still haven't got the pump video posted to Rennbay yet. There is the link though.