gmc Workshop Repair Guides

GMC Workshop Manuals

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Vacuum Pump: Service and Repair

Fig. 2 Gear driven vacuum pump. Chevrolet & GMC

GEAR DRIVEN PUMP
Removal

1.

Remove vacuum hose from vacuum pump inlet.

2.

Remove bolt and clamp holding drive assembly to engine block, Fig. 2.

3.

Carefully lift pump and drive assembly out of engine block.

4.

Cover hole in engine block with cloth to prevent foreign matter from falling into engine block.

Installation

1.

Remove protective cloth from engine.

2.

Install pump and drive assembly in engine, ensuring gears on drive assembly mesh with gears on engine camshaft.

3.

Rotate pump into position so bracket and bolt can be installed.

4.

Install clamp and bolt, torquing bolt to 20 ft. lbs.

5.

Connect vacuum hose to pump.

Fig. 3 Belt driven vacuum pump. Chevrolet & GMC

BELT DRIVEN PUMP
Removal

1.

Disconnect battery ground cable.

2.

Disconnect vacuum hose.

Brakes and Traction Control > Power Brake Assist > Vacuum Pump, Brakes > Component Information > Description and Operation > Page 3824

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