Removal Procedure

Measure the oil pressure and compare with the specified values. Refer to Oil Pressure Diagnosis and Testing .
Remove the engine front cover. Refer to Engine Front Cover with Oil Pump Replacement .
Remove the 8 oil pump cover bolts (1).

Fig 1: Engine Oil Pump Cover And Bolts
Courtesy of GENERAL MOTORS COMPANY
Remove the oil pump cover (2).
Protect the engine front cover edge (1) with a suitable piece of plastics.

Fig 2: Oil Pump Slide Spring Windings And Engine Front Cover Edge
Courtesy of GENERAL MOTORS COMPANY

WARNING: Before removing the spring, cover the spring with a towel to prevent the spring from flying and possibly causing damage or personal injury.

NOTE: Add the screw driver between the oil pump slide spring windings (2).
Compress the oil pump slide spring with a screw driver and remove the oil pump slide spring in compound with the oil pump slide spring pin.
Remove the oil pump components in the following order:

Fig 3: Locating Engine Oil Pump Components
Courtesy of GENERAL MOTORS COMPANY

NOTE: Mind the installation position of the oil pump components.
1. Outer oil pump vane ring (1).
2. Oil pump vane rotor (3) and the 7 oil pump vanes (2).
3. Inner oil pump vane ring (6).
4. Oil pump slide (4) and the 2 oil pump slide seals with the 2 oil pump slide seal springs (5).