I have just purchased a rebuilt power steering pump for my '88.  The rebuilt
unit is studded where it connects to the mounting plate.  The existing pump
is bolted through the mounting plate to the pump body.  The existing pump
manufacture date is 1992, the rebuilt pump is 1989.  I am always leery of
rebuilds, since you never know what  production year the core comes from.

When checking with a straight edge, the existing pump sheave to drive sheave
has ~3/16" parallel misalignment.  This axial loading is probably the cause
for the whining pump in the first place.  (belt not straight)

Could some one look at the engine in a similar vintage van and tell me if
the sequence is:

        stud through the pump body, nut, mounting plate, nut

        or,

        pump body, mounting plate, through bolt

A picture would be great.  Either way I will have to shim to get the
parallel alignment correct, I guess.

Regards,

Mike Pedersen
'88 Westy GL Automatic
Powell River, BC