Disassembly and Reassembly

Disassembly
1. Clean the oil pump with solvent (plug the discharge and suction ports to prevent the entry of solvent).
Be careful not to expose the oil seal of shaft assembly to solvent.
2. Remove the bolt, suction pipe and O-ring.
3. Remove the connector, O-ring, relief valve and spring.
4. Remove the pressure switch assembly.
5. Remove the bolt, rear housing and O-ring.
6. Remove the snap ring.
7. Remove the shaft assembly.
8. Remove the oil seal.

Caution: When removing the oil seal, be careful not to damage the housing.

9. Remove the pump cartridge assembly from the front housing.
10. Remove two O-rings.

Inspection and Repair
Make all necessary adjustments, repairs, and part replacements if wear, damage, or other problems are discovered during inspection.

Rotor





Check that the groove in the vane is free from excessive wear and that the vane slides smoothly. When part replacement becomes necessary, the pump cartridge should be replaced as a subassembly.

Vane





Sliding faces of the vane should be free from wear. (Particularly the curved face at the tip that contact with the cam should be free from wear and distortion). When part replacement becomes necessary, the pump cartridge should be replaced as a subassembly.

Cam
The inner face of the arm should have a uniform contact pattern without a sign of step wear. When part replacement becomes necessary, the pump cartridge should be replaced as a subassembly.

Side Plate
The sliding faces of parts must be free from step wear (more than 0.01 mm), which can be felt by the fingernail.
The parts with minor scores may be reused after lapping the face.

Relief Valve
The sliding face of the valve must be free from burrs and damage. The parts with minor scores may be reused after smoothing with emery cloth (#800 or finer).

Shaft
Oil seal sliding faces must be free from a step wear, which can be felt by the fingernail. Bushing fitting face must be free from damage and wear.

O-ring, Oil Seal, Snap Ring
Be sure to discard used parts, and always use new parts for installation. Prior to installation, lubricate all seals and rings with power steering fluid.

Pressure Switch
Check the switch operation as follows:
With engine idling and A/C on, turn the steering wheel fully to the left; compressor should interrupt and engine idle speed will increase. Shut off A/C and again turn steering fully to the left; engine idle will increase. If system fails to function properly, disconnect connector at the pressure switch and repeat system check while testing continuity across disconnected SW connector.

Reassembly
1. Install oil seal to front housing. Be sure to discard used oil seal, and always use new parts for installation.

Caution: When installing the oil seal, be careful not to damage the oil seal contacting surface of the housing.

2. Install shaft assembly.





3. Install the vanes to rotor with curved face in contact with the inner wall of cam.
4. Install rotor and vanes to cam.
5. Install pin to front housing.
6. Install two new O-rings to front housing. Be sure to discard used O-ring.
7. Install side plate.

Caution: When installing side plate, be careful not to damage its inner surface. Damaged side plate may cause poor pump performance, pump seizure or oil leakage.

8. Install pump cartridge assembly to front housing.
9. Install snap ring to shaft end.
10. Install rear housing with a new O-ring. Be sure to discard used O-ring. Then install bolt and tighten it to specified torque.
Torque: 24 Nm (17 ft. lbs.)
11. Install suction pipe with a new O-ring. Be sure to discard used O-ring. Then install bolt and tighten it to specified torque.
Torque: 10 Nm (87 inch lbs.)
12. Install relief valve and spring.
13. Install connector with a new O-ring. Be sure to discard used O-ring. Tighten the connector to specified torque.
Torque: 59 Nm (43 ft. lbs.)
14. Install pressure switch assembly and tighten it to specified torque.
Torque: 18 Nm (13 ft. lbs.)