Oil Pump Disassemble

WARNING: This page is about a different car, the 2003 Buick Century. However, it is still accessible from the selected car via links, so may be relevant.

Remove the oil pump driveshaft and oil pump driveshaft retainer.

Fig 1: Removing Oil Pump Driveshaft & Oil Pump Driveshaft Retainer
Courtesy of GENERAL MOTORS CORP.

IMPORTANT: DO NOT remove the oil pump screen from the pipe. The pipe and oil pump screen are serviced as a complete assembly.
Remove the oil pump screen, if necessary.
The oil pump screen has a press fit into the oil pump cover.

Fig 2: Removing Oil Pump Screen
Courtesy of GENERAL MOTORS CORP.
Remove the oil pump cover bolts.

Fig 3: Removing Oil Pump Cover Bolts
Courtesy of GENERAL MOTORS CORP.
Remove the oil pump cover.

Fig 4: Removing Oil Pump Cover
Courtesy of GENERAL MOTORS CORP.
Remove the oil pump drive gear and the oil pump driven gear.
Matchmark the gear teeth for assembly.

Fig 5: Removing Oil Pump Drive Gear & Oil Pump Driven Gear
Courtesy of GENERAL MOTORS CORP.

CAUTION: Refer to Safety Glasses Caution in Cautions and Notices.

CAUTION: In some models, the pressure regulator valve spring is under pressure. Remove the retaining pin carefully in order to avoid bodily injury.
Remove the following items:
1. 7.1. The oil pump pressure relief valve spring straight pin.
2. 7.2. The oil pump pressure relief spring.
  CAUTION: Refer to Cleaning Solvent Caution in Cautions and Notices.
3. 7.3. The oil pump pressure relief valve. If the valve is stuck, soak the pump housing in cleaning solvent.
  
  Fig 6: Removing Oil Pump Pressure Relief Valve Spring & Straight Pin
  Courtesy of GENERAL MOTORS CORP.