Power Steering Pump: Service and Repair

REMOVAL

NOTE: Be sure to clean each joint of suction and discharge sides thoroughly before removal.

1. Remove engine under cover of right side, loosen belt tension pulley and remove P/S V-ribbed belt.
2. Disconnect high pressure hose and suction hose from pump. As fluid flows out of disconnected joints, put a container under joints or a plug to hose.

CAUTION: When disconnecting, take care not to cause damage to A/C condenser, if equipped.

3. Disconnect pressure switch lead harness.
4. Remove A/C compressor from bracket with A/C hose still attached (if equipped).

NOTE: Hang removal A/C compressor with a wire hook or the like so as to prevent A/C hose from bending and twisting excessively or being pulled.





5. Remove oil pump together with its bracket, then remove oil pump from bracket.

NOTE: Plug each port of removed pump to prevent dust or any other foreign matter from entering.






DISASSEMBLY
1. Clean its exterior thoroughly.
2. With aluminum plates placed on vise first, grip pump body with it.
3. Remove suction connector bolt, suction connector and O-ring from pump body.
4. Remove power steering pressure switch (terminal set) from pump body.
5. Remove plug, flow control spring and relief valve (flow control valve) from pump body.
6. Remove cover bolts, pump cover and O-ring from pump body.
7. Remove snap ring from pump shaft.
8. Remove vanes from rotor.
9. Remove cam ring, rotor, side plate and O-rings from pump body.
10. Pull out pulley from pump body.
11. Remove oil seal from pump body.

INSPECTION
Pump Body, Cover, Side Plate and Shaft





Check sliding surfaces of each part for wear and damage. If any defect is found, replace pump assembly.

Cam Ring





Check vane sliding surface of cam ring for wear and damage. If any defect is found, replace pump assembly.

Rotor and Vane





^ Check sliding surfaces of rotor and vane for wear and damage.





^ Check clearance between rotor and vane.
Clearance:
Standard 0.01 mm (0.0004 inch)
Limit 0.06 mm (0.0023 inch)
Replace pump assembly if any defect is found in above checks.

Relief Valve (Flow Control Valve) and Its Spring





^ Check fluid passage of relief valve and orifice of connector for obstruction (clogged).
^ Check sliding surface of relief valve for wear and damage.





^ Check free length of relief valve spring.
Free length:
Standard 22.0 mm (0.866 inch)
Limit 19.0 mm (0.748 inch)
Replace if any defective is found.

ASSEMBLY
Reverse disassembly procedure for assembly, noting the following.





1. Apply grease to oil seal lip and apply power steering fluid to sliding surface of the shaft then insert pulley's shaft from oil seal side of the pump body.
"A": Grease 99000-25010





2. Apply power steering fluid to O-rings and fit them to pump body.





3. Install side plate to pump body.

NOTE: Carefully align the dowel pins on the side plate at bolt hole as shown in figure.

4. Apply power steering fluid to sliding surface of rotor.





5. Install rotor to shaft, directing dot marked side of rotor facing up.
6. Install new snap ring to shaft, then make sure to fit snap into shaft groove securely.

NOTE: Never reuse the removed snap ring.

7. Apply power steering fluid to sliding surface of cam ring.





8. Install cam ring to pump body. The tapered end of cam ring should face the side plate.
9. Apply power steering fluid to each vane.





10. Install vanes (10 pieces) to rotor.
11. Apply power steering fluid to O-ring.





12. Install O-ring to pump body.
13. Apply power steering fluid to sliding surface of pump cover and rotor.





14. Match the dowel pins to the holes of the cover plate as shown and install pump cover to pump body.





15. Gradually tighten pump cover bolts to specified torque.

NOTE: After installing pump cover, check to make sure that shaft can be turned by hand.

Tightening Torque (a): 28 Nm (2.8 kg-m, 20.0 ft. lbs.)
16. Apply power steering fluid to O-ring of terminal switch.





17. Install pressure switch to pump body.
Tightening Torque (b): 28 Nm (2.8 kg-m, 20.0 ft. lbs.)
18. Apply power steering fluid to relief valve (flow control valve).
19. Install relief valve (flow control valve) to pump body.
20. Install flow control spring.
21. Apply power steering fluid to O-rings of plug.
22. Install O-rings to plug.





23. Tighten plug to specified torque.
Tightening Torque (c): 60 Nm (6.0 kg-m, 43.5 ft. lbs.)
24. Apply power steering fluid to O-ring of suction connector.





25. Install O-ring to suction connector.





26. Install suction connector to pump body as shown in figure. Tighten suction connector bolts to specified torque.
Tightening Torque (d): 12 Nm (1.2 kg-m, 8.5 ft. lbs.)

INSTALLATION
Reverse removal procedure.





^ Use specified torque as given below.
Tightening Torque (a): 55 Nm (5.5 kg-m, 40.0 ft. lbs.)