The directions here were very helpful, but there are a few things that will be helpful for others who follow the instructions above. There are also some differences between models and years.

WARNING: My pump broke off! I am lucky it didn't happen under difficult driving conditions. I found another used one with cracked mounts. My mechanic says this happens. If you see cracks on the mounting points of your pump don't put it back in!

1. Crack-loose the bolts that hold the PS pump pulley on before removing the belt.

2. On the 1991 350SD it is not necessary to drain any radiator fluid or remove the air cleaner.

3. When the belt tensioner and belt is loosened remove the pulley from the shaft of the PS pump.

4. The pump on the 350SD has a small steel bracket attached to it in the back with two star-drive bolts. These bolts do not need to be removed to get the pump out, and it would be too difficult anyway. Instead loosen, but do not remove, the aluminum bracket that attaches the steel bracket to the engine with the two 13mm bolts, then remove the two long bolts that hold the pump on from the front. On mine the lower bolt was another one of those star-drives.

5. The belt can be removed and replaced by loosening the fan shroud with the clips at the top. The directions showing the order for replacing the belt are in the owner's manual.

6. Make sure that you remember how the pump comes apart so you can put it back together the same way.

7. The clip that holds the rotor on the shaft is tough. I used two small screw drivers to open it up a bit and then stuck one of them in on one side to pull the clip over the end of the shaft. It had to be bent back into shape before re-installation.

8. When rebuilding the pump use one of those fat rubber bands to hold the vanes of the pump together so they don't fall out. Unless you need to clean it up I think it is best to let the vanes have their original homes.

9. Make sure you use a new filter and seals.

10. The pump goes back in the same way it came out. A little WD40 on the steel bracket at the back of the pump makes it slip into the slot easier.

11. Clean oil and grease off the long bolts and the nut on the top one, put them in and partially tighten them.

12. Re-tighten the 13mm bolts that hold the aluminum bracket to the engine block.

13. Tighten all the bolts up.

14. Put the pulley back on.

15. Be very careful not to cross-thread the fittings to the pump. The pump is aluminum and it would be easy to do.

16. Don't use automatic transmission fluid to refill. Order Beilstein PS fluid because it will prevent the seals from drying out.

17. Run the car for a minute, turn the steering wheel both directions, and refill the fluid to the max fill mark.

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1991 350SD (updated rods)
Biodiesel B100 when I can find it.
Dino when really cold outside