Disassembly and Reassembly

Power Steering Pump Disassemble





1. Remove the power steering pump from the vehicle. Refer to Power Steering Pump Replacement.
2. Clean the pump exterior thoroughly.
3. Mount the pump in a table vise.
4. Remove the following components from the pump body:
- The power steering gear outlet hose connector bolt
- The power steering gear outlet hose connector (1)
- The O-ring





5. Remove the pressure switch (1) from the pump body.
6. Remove the flow control valve from the pump body.





7. Remove the 4 bolts (1,2,3,4) from the pump in order to remove the rear pump cover and the O-ring seal from the pump body.





8. Remove the cam ring (1) from the pump shaft.

Important: During disassembly, ensure that the vanes are kept together and identified so that they can be reinstalled in the original locations.

9. Remove the vanes from the rotor.





10. Remove the following components from the pump body:
- The snap ring (3)
- The rotor (2)
- The side plate
- The O-rings
11. Remove the shaft with the pulley attached from the pump body.
12. Remove the oil seal from the pump body.

Inspection Procedure





1. Inspect the power steering pump body and the cover for cracks or leaks.
2. If any of the following conditions are present on the pump body or any internal part, replace the power steering pump. Refer to Power Steering Pump Replacement.
- Excessive wear
- Cracks
- Leaks





3. Inspect the side plate and the shaft for excessive wear and damage. If any defect is found, replace the pump assembly. Refer to Power Steering Pump Replacement.





4. Inspect the cam ring for excessive wear and damage. If any defect is found, replace the pump assembly. Refer to Power Steering Pump Replacement.





5. Inspect the sliding surfaces of the rotor and the vane for wear and damage. If wear or damage is present, replace the rotor and the vanes with the power steering pump seal kit.





6. Use a feeler gauge (1) in order to measure the vane-to-rotor clearance.

- Measurement
The allowable vane-to-rotor clearance is 0.015 - 0.027 mm (0.0006 - 0.0011 inch).
7. If the vane to rotor clearance is greater than the specified range, replace the rotor and the vanes with the power steering pump seal kit.





8. Inspect the fluid passage of the relief valve and the orifice of the connector for obstructions.
9. Inspecting the sliding surface of the relief valve for wear and damage.





10. Use the dial calipers in order to measure the free length of the flow control valve spring (1).

- Measurement
The free length of the spring should be within 19.0 - 22.0 mm (0.748 - 0.866 inch).
11. If the valve spring does not fall within the specifications, replace the power steering pump. Refer to Power Steering Pump Replacement.

Power Steering Pump Assemble





1. Apply wheel bearing lubricant, GM P/N 1051344, or equivalent, to the oil seal lip.
2. Apply DEXRON(R) - III Automatic Transmission Fluid, GM P/N 12346143, or equivalent, to the sliding surface of the shaft (1).
3. Insert the pulley's shaft from the oil seal side of the pump body (2).





4. Apply DEXRON(R) - III Automatic Transmission Fluid, GM P/N 12346143, or equivalent, to the O-rings and fit the O-rings (1,2) to the pump body.





5. Install the side plate (1) to the pump body. Carefully align the dowel pins on the side plate with the bolt hole (2).





6. Apply DEXRON(R) - III Automatic Transmission Fluid, GM P/N 12346143, or equivalent, to the sliding surface of the rotor (2).
7. Place the rotor with the dot (1) side facing upward. Install the rotor to the shaft (3).

Important: Do not reuse old snap rings.

8. Install a new snap ring to the shaft (3), fitting the snap ring securely into the shaft groove.





9. Apply DEXRON(R) - III Automatic Transmission Fluid, GM P/N 12346143, or equivalent, to the sliding surface of the cam ring (1).
10. Install the cam ring to the pump body. Place the tapered end of the cam ring facing the side plate (2).





11. Apply DEXRON(R) - III Automatic Transmission Fluid, GM P/N 12346143, or equivalent, to each vane (2).
12. Install 10 vanes to the rotor (1).
13. Install the snap ring to the pump shaft.





14. Apply DEXRON(R) - III Automatic Transmission Fluid, GM P/N 12346143, or equivalent, to the O-ring (1).
15. Install the O-ring to the pump body.





16. Apply DEXRON(R) - III Automatic Transmission Fluid, GM P/N 12346143, or equivalent, to the sliding surface of the pump cover (2) and the rotor.
17. Match the dowel pins (3,4) to the holes of the cover plate and install the pump cover to the pump body.





Notice: Refer to Fastener Notice in Service Precautions.

18. Install 4 pump cover bolts (1,2,3,4) to the pump cover (5).

- Gradually tighten the pump cover bolts to 23 Nm (17 ft. lbs.).





19. Apply DEXRON(R) - III Automatic Transmission Fluid, GM P/N 12346143, or equivalent, to the O-ring of the pressure switch (1).
20. Install the pressure switch to the pump body (2).

- Tighten the pressure switch to 28 Nm (20 ft. lbs.).





21. Apply DEXRON(R) - III Automatic Transmission Fluid, GM P/N 12346143, or equivalent, to the relief valve.
22. Install the relief valve to the pump body (1).
23. Install the flow control spring.
24. Apply DEXRON(R) - III Automatic Transmission Fluid, GM P/N 12346143, or equivalent, to the O-rings of the plug.
25. Install the O-rings to the plug (2).

- Tighten the plug to 60 Nm (43.5 ft. lbs.).





26. Apply DEXRON(R) - III Automatic Transmission Fluid, GM P/N 12346143, or equivalent, to the O-ring (2) of the suction connector (1).
27. Install the O-ring to the suction connector.





28. Install the power steering gear outlet hose connector (1) to the pump body (2).

- Tighten the power steering gear outlet hose connector bolts (3) to 10 Nm (88.5 inch lbs.).

29. Install the power steering pump to the vehicle.
Refer to Power Steering Pump Replacement.