I have a "bearing failing" noise going from the belt area. Its kinda a random chirp, grinding noise.

I originally thought it was a defective water pump that was only a week old. I replaced it, but the noise was still there. While the car was running, I sprayed the power steering pump shaft with some WD40 (between the pulley and pump) and the noise went away immediately. I had the same problem in my diesel toyota, and I simply rebuilt the pump with a new seal kit and bearing.

Iv been searching and searching, but no where does anyone mention the bearing when they rebuild the pump. I cannot find any pictures, or part numbers. Surly there must be one? Just to confirm, what would be the seal kit part number from mercedes? Bearing part number ?

Vehicle : 1986 260e, Euro spec.

Thank you