K 2500 Truck 4WD V8-379 6.2L DSL VIN C FI (1989)
Vacuum Pump: Service and Repair
Fig. 2 Gear Driven Vacuum Pump
Remove vacuum hose from vacuum pump inlet.
Remove bolt and clamp holding drive assembly to engine block, Fig. 2.
Carefully lift pump and drive assembly out of engine block.
Cover hole in engine block with cloth to prevent foreign matter from falling into engine block.
Remove protective cloth from engine.
Install pump and drive assembly in engine, ensuring gears on drive assembly mesh with gears on engine camshaft.
Rotate pump into position so bracket and bolt can be installed.
Install clamp and bolt. Torque bolt to 20 ft. lbs.
Connect vacuum hose to pump.