I did this job last year on the same van.  Removed the main crank pulley and
replaced the seal while I was there, didn�t remove distributor, AC or PS;
did remove the engine guards for easer access from below.   Next time the
crank pulley won�t have to come off since I cut the upper coolant tube just
below the distributor and installed a piece of hose w/clamps to allow for
removal w/o pulley interference.  Anyone interested in a pic let me know and
I�ll send one over.

Regards,

Pedro
Coral Gables, FL