This is a real pain. If I remember correctly this is one of the old PS pumps without the allen on the back middle right of the housing looking at the engine from the front. If you have the allen, then losen the three bolts and tighten the allen bolt. If you do not (almost definitely you do not) then you release all the bolts on the housing enough to move the ps pump then you get a large screw driver (3 feet like a crow bar) and push the PS pump away from the crankshaft (do not use the distributer as the lever) then when it is tight hold it and tighten your belts.
2005 320 CDI
2006.5 VW Jetta TDI
1991 560SEL (179000 Sold)
1972 280SEL 4.5 ('The Lead Sled' 320000 miles when sold.)
1972 220D (225000 when sold)