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Home >> GMC >> 1989 >> Value Van P3500, 4.8 T, Standard >> Repair and Diagnosis >> Accessories & Equipment >> Vacuum Pumps/Lines/Tanks/Water Trap >> Vacuum Pump - 6.2L Diesel >> Removal & Installation >> Vacuum Pump >> Removal & Installation (Gear Driven Pump)

Removal & Installation (Gear Driven Pump)

  1. Remove air cleaner. Cover air intake with Cover Set (J-29664) to prevent dirt from entering manifold. Remove vacuum hose from pump inlet. Disconnect speed sensor. Remove bolt and bracket holding drive assembly to engine block. Remove pump and drive assembly.
  2. To install, reverse removal procedure. Rotate pump so inlet tube faces front of engine. See Fig 1 . Pump should be at 20 degree angle. Tighten bracket bolt to 20 ft. lbs. (27 N.m).
NOTE: DO NOT run engine without gear driven vacuum pump installed. Oil pump is powered by vacuum pump drive gear.
Fig 1: Gear Drive Vacuum Pump
G117172Courtesy of GENERAL MOTORS CORP.