Power Steering Pump: Service and Repair
A: REMOVAL1. 2.5 l MODEL
1. Remove ground cable from battery.
2. Remove pulley belt cover bracket.
3. Loosen lock bolt and slider bolt and remove power steering pump drive V-belt.
4. Disconnect connector from power steering pump switch.
5. Disconnect pipe C and suction hose from oil pump.
CAUTION:
^ Do not allow fluid from the hose end to come into contact with pulley belt.
^ To prevent foreign matter from entering the hose and pipe, cover the open ends with a clean cloth.
6. Remove bolts which install power steering pump bracket.
7. Place oil pump bracket in a vise, remove two bolts from the front side of oil pump.
CAUTION: Do not place oil pump bracket directly in the vise; use soft pads and hold oil pump lightly to protect the pump.
8. Remove socket from oil pump.
9. Remove bolt from the rear side of oil pump.
10. Disassemble oil pump and bracket by inserting a screwdriver as shown in the figure.
2. 3.0 l MODEL
1. Remove ground cable from battery.
2. Remove pulley belt cover.
3. Remove V-belt.
4. Disconnect connector from power steering pressure switch.
5. Remove tensioner adjuster.
6. Disconnect pressure hose and suction hose from oil pump.
CAUTION:
^ Do not allow fluid from the hose end to come into contact with pulley belt.
^ To prevent foreign matter from entering the hose, cover the open ends with a clean cloth.
7. Remove bolts, which install power steering pump bracket.
8. Place oil pump bracket in a vise, remove two bolts from the front side of oil pump.
CAUTION: Do not place oil pump bracket directly in the vise; use soft pads and hold oil pump lightly to protect the pump.
9. Remove bolt from the rear side of oil pump.
10. Remove oil pump from bracket.
B: INSTALLATION
1. 2.5 l MODEL
1. Install oil pump to bracket.
1. Place oil pump bracket in a vise. Tighten bushing using a 12.7 mm (1/2") type 14 and 21 mm box wrench until it is in contact with oil pump mounting surface.
CAUTION: Do not place oil pump bracket directly in the vise; use soft pads and hold oil pump lightly to protect the pump.
2. Tighten bolt which secures oil pump to bracket.
Tightening torque: 37.3 Nm (3.8 kgf-m, 27.5 ft. lbs.)
Tightening torque: 15.7 Nm (1.6 kgf-m, 11.6 ft. lbs.)
2. Install socket to oil pump.
Tightening torque: 6.5 Nm (0.66 kgf-m, 4.8 ft. lbs.)
3. Tighten bolt which secures power steering pump bracket.
Tightening torque: 22 Nm (2.2 kgf-m, 15.9 ft. lbs.)
4. Interconnect pipes C and suction hose.
Tightening torque:
Joint nut 39.2 Nm (4 kgf-m, 28.9 ft. lbs.)
CAUTION: If a hose is twisted at this step, the hose may come into contact with some other parts.
5. Connect connector to power steering oil pressure switch.
6. Install pulley belt to oil pump.
7. Check pulley belt tension.
8. Tighten bolt belt tension.
Tightening torque: 8 Nm (0.8 kgf-m, 5.8 ft. lbs.)
9. Install pulley belt cover bracket.
10. Connect ground cable of battery.
11. Feed the specified power steering fluid.
CAUTION: Never start the engine before feeding the fluid; otherwise vane pump might be seized up.
2. 3.0 l MODEL
1. Install oil pump to bracket.
1. Place oil pump bracket in a vise. Tighten bushing using a 12.7 mm (1/2") type 14 and 21-mm box wrench until it is in contact with oil pump mounting surface.
CAUTION: Do not place oil pump bracket directly in the vise; use soft pads and hold oil pump lightly to protect the pump.
2. Tighten bolt which installs oil pump to bracket.
Tightening torque: 15.7 (1.6 kgf-m, 11.6 ft. lbs.)
Tightening torque: 37.3 (3.8 kgf-m, 27.5 ft. lbs.)
2. Tighten bolt which installs power steering pump bracket.
Tightening torque: 33.3 (3.4 kgf-m, 24.5 ft. lbs.)
3. Interconnect pressure hose and suction hose.
Tightening torque:
Joint nut 39.2 Nm (4 kgf-m, 28.9 ft. lbs.)
CAUTION: If a hose is twisted at this step, the hose may come into contact with some other parts.
4. Connect connector to power steering oil pressure switch.
5. Install tensioner adjuster.
6. Install V-belt.
7. Install pulley belt cover.
8. Connect ground cable of battery.
9. Feed the specified power steering fluid.
CAUTION: Never start the engine before feeding the fluid; otherwise vane pump might be seized up.
C: DISASSEMBLY
NOTE: Oil pump for 3.0 l model cannot be disassembled. If the oil pump is malfunctioning, replace the oil pump as an assembly.
1. Using ST, place oil pump in a vise and remove four bolts, which secure rear cover.
ST 341 99AE020 ATTACHMENT
2. Remove pressure plate.
3. Using a slot-type screwdriver, pry retaining ring off.
CAUTION: Do not remove cam ring, rotor, etc.
4. Install pressure plate.
5. Temporarily install rear cover to front casing.
6. Remove oil pump pulley.
7. Place oil pump in a vise.
CAUTION: Do not place oil pump directly in the vise, use soft pads and hold oil pump lightly to protect the pump.
8. Pry oil seal off using a slot-type screwdriver.
CAUTION: Be careful not to scratch inner surface of casing.
D: ASSEMBLY
1. Reassembly precautions
1. Whenever O-rings, oil seals, and snap rings are removed, they must be replaced with new ones.
2. Thoroughly wash parts and allow to dry. They must be kept free from cleaning oil and dust.
3. Reassembly procedure must be performed in clean place. Ensure that parts are kept away from waste threads or other dust particles.
4. Cleaning oil tends to stay inside the front casing. Remove it completely by blowing compressed air.
5. Ensure that parts are free from rust. (Use specified hydraulic oil for rust prevention after cleaning and drying.)
6. Reverse the sequence of disassembly procedures.
2. Apply grease to oil seal and inner surface of front casing (at bearing location).
CAUTION: Make sure that the front body internal surfaces are free from damage.
3. Temporarily install rear cover to front body.
4. Attach ST to front body. Using a press, install oil seal.
ST 341 99AE030 INSTALLER
5. Install pump pulley to front body.
6. Using ST, place oil pump in a vise.
ST 341 99AE020 ATTACHMENT
7. Remove rear cover.
8. Using 10-mm box wrench, tap retaining ring into shaft groove.
9. Install pressure plate as shown in the figure.
10. Apply specified hydraulic oil to O-rings and fit them into front casing and pressure plate.
11. Install seal ring to pressure plate.
12. With knock pin positions aligned, install rear cover.
Tightening torque: 27.5 Nm (2.8 kgf-m, 20.3 ft. lbs.)
CAUTION: Loosely tighten bolts in the sequence (A), (B), (C), and (D) shown in figure. Then, tighten in the same sequence.
13. When reassembly procedures have been completed, turn shaft by hand to ensure it turns smoothly. If it binds or other unusual conditions are evident, disassemble again and check for foreign matter trapped on sliding surfaces and improper installation. Eliminate the cause of trouble.
14. Check followings by referring to "CHECK" article.
^ Excessive play in pulley shaft
^ Ditch deflection of pulley
^ Resistance to rotation of pulley
^ Measurement of generated oil pressure