G 20 Van V8-379 6.2L DSL VIN C FI (1992)
Vacuum Pump: Adjustments
Place V-belt tension gage, P/N J 23600-B, at the center of the greatest span.
Tighten new belt to 650 N (146 lb)
Tighten old belt to 300 N (67 lb)
Never exceed new belt specifications when tightening any belt.