Power Steering Pump: Service and Repair
Oil PumpREMOVAL
1. Disconnect the ground cable from battery.
2. Remove the pulley belt cover.
3. Loosen the belt tension adjusting bolt and generator securing bolt, and then remove the power steering pump V-belt.
4. Disconnect the connector from power steering pump switch.
5. Disconnect the 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, cover the open ends of them with a clean cloth.
6. Remove the bolts which install the power steering pump bracket.
7. Place the oil pump bracket in a vise, remove the two bolts from front side of oil pump.
CAUTION: Do not place the oil pump bracket directly in the vise; use soft pads and hold oil pump lightly to protect the pump.
8. Remove the bolt from the rear side of oil pump.
9. Disassemble the oil pump and bracket by inserting a flat tip screwdriver as shown in the figure.
INSTALLATION
1. Install the oil pump to bracket.
1. Place the oil pump bracket in a vise. Tighten the bushing using a 12.7 mm (1/2) type 14 mm and 21 mm box wrench until it is in contact with the oil pump mounting surface.
CAUTION: Do not place the oil pump bracket directly in the vise; use soft pads and hold oil pump lightly to protect the pump.
2. Tighten the bolts which install the oil pump to bracket.
2. Tighten the bolts which install the power steering pump bracket.
3. Interconnect the pipe C and suction hose.
Tightening torque:
Eye bolt 39 Nm (4.0 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 the connector to power steering pump switch.
5. Install the pulley belt to oil pump.
6. Check the pulley belt tension.
7. Tighten the bolt of belt tension.
Tightening torque: 25 Nm (2.5 kgf-m, 18.1 ft. lbs.)
8. Install the pulley belt cover.
9. Connect the battery ground cable to battery.
10. Feed the specified power steering fluid.
CAUTION: Never start the engine before feeding the fluid; otherwise vane pump might be seized up.
INSPECTION
BASIC INSPECTION
Perform the following inspection procedures and repair or replace defective parts.
SERVICE LIMIT
Make a measurement as follows. If it exceeds the specified service limit, replace the parts with new ones.
CAUTION:
^ Fix the oil pump on a vise to make a measurement. At this time, hold the oil pump with least possible force between two wood pieces.
^ Do not set outside of flow control valve or pulley on a vise; otherwise outside or pulley might be deformed. Select properly sized wood pieces.
1. Play of the pulley shaft
Condition:
P: When applying the force of 9.8 N (1.0 (kgf, 2.2 lb)
2. Ditch deflection of pulley
Service limit: 1.0 mm (0.039 inch) or less
NOTE: Read the value for one surface of V ditch, and then the value for another off the dial.
3. Resistance to rotation of pulley
Service limit:
Maximum load: 9.22 N (0.94 (kgf, 2.07 lb) or less
NOTE:
^ A rather higher value may be indicated when pulley starts turning.
^ Measure the load during rotation and make a judgment.
HYDRAULIC PRESSURE
NOTE:
^ Be sure to complete all items aforementioned in INSPECTION, prior to measuring hydraulic pressure. Otherwise, pressure can not be measured correctly.
^ Do not leave the valve of pressure gauge closed or hold the steering wheel at stop end for 5 seconds or more in any case, as the oil pump may be damaged due to long keep of these conditions.
^ Put a cotton cloth waste at a place where fluid drops before the pressure gauge is installed. Wipe off split fluid thoroughly after the measurement.
1. REGULAR PRESSURE MEASUREMENT
1. Connect the ST1, ST2 and ST3.
ST1 925711000 PRESSURE GAUGE
ST2 34099AC020 ADAPTER HOSE B
ST3 34099AC010 ADAPTER HOSE A
2. Remove the air intake duct.
3. Disconnect the pipe C from the pump.
4. Using the gasket (Part No. 34621AC022) and bolt (Part No. 34620AC010), install the ST2 to the pump instead of pipe C.
5. Install the ST3 to end of pipe C removed from pump.
6. Replenish power steering fluid up to the specified level.
7. Open the valve, and start the engine.
8. Measure the regular pressure.
ST1 925711000 PRESSURE GAUGE
ST2 34099AC020 ADAPTER HOSE B
ST3 34099AC010 ADAPTER HOSE A
Service limit: 981 kPa (10 kg/cm2, 142 psi) or less
9. If it is not within the specified value, replace the troubled part caused by the following symptoms; pipe or hose clogged, leaks from fluid line, and mix of foreign objects in fluid line.
2. Measure the relief pressure.
1. Using the STs, measure the relief pressure.
2. Close the valve.
3. Measure the relief pressure.
ST1 925711000 PRESSURE GAUGE
ST2 34099AC020 ADAPTER HOSE B
ST3 34099AC010 ADAPTER HOSE A
Service limit:
Non-turbo model: 6,767 - 7,453 kPa (69 - 76 kg/cm2, 981 - 1,081 psi)
Turbo model: 7,350 - 8,O36 kPa (75 - 82 kg/cm2, 1,067 - 1,165 psi)
STi model: 8,100 - 8,800 kPa (83 - 90 kg/cm2, 1,175 - 1,276 psi)
4. If it is not within the specified value, replace the oil pump.
3. Measure the working pressure.
1. Using the STs, measure the working pressure.
2. Open the valve.
3. Measure the working pressure of control valve by turning wheel from stop to stop.
ST1 925711000 PRESSURE GAUGE
ST2 34099AC020 ADAPTER HOSE B
ST334099AC010 ADAPTER HOSE A
Service limit:
Non-turbo model: 6,767 - 7,453 kPa (69 - 76 kg/cm2, 981 - 1,081 psi)
Turbo model: 7,350 - 8,O36 kPa (75 - 82 kg/cm2, 1,067 - 1,165 psi)
STi model: 8,100 - 8,800 kPa (83 - 90 kg/cm2, 1,175 - 1,276 psi)
4. If it is within the specified value, measure the steering effort. If it is not within specified value, replace the control valve itself or control valve and pinion as a single unit with new ones.