Power Steering Pump: Testing and Inspection
TOOL REQUIRED- 998 8695 SRS Test Instrument
- 999 5055 Manometer
- 999 5175 Nipple
- 999 5319 Connector
- 999 5320 Connector
- 999 8081 Torque Wrench
WARNING:
- Take The Recommended Precautions When Working With Cars Equipped With The SRS System.
- The Battery Must Not Be Connected And Ignition Switched On When The Steering Wheel Module Is Removed Or Replaced.
- This Is To Prevent The Airbag Deploying Accidentally.
1. Connect test instrument between the power steering pump and the pressure pipe using nipples.
- Nipple is connected to the power steering pump and nipple is connected to the power steering pump pipe.
- Feed the hose into the engine compartment as far as possible
- Position a manometer so that it can be read from the driver's seat.
NOTE:
- Connect the hose from the instrument petcock to the pressure pipe.
- The petcock should be parallel with the hose.
2. Fill the reservoir with oil:
- Fill nearly to the brim.
- Transmission oil grade:
ATF oil type F. G.
Dexron II D, E, III
Ford Mercon
Volvos synthetic ATF oil, P/N 1 161 317-1.
NOTE:
- Synthetic oil can be mixed with normal ATF but the cold weather properties are greatly reduced.
- When changing to synthetic oil the system should be completely emptied of oil.
- Start the engine and turn the steering wheel between left and right limit positions.
Check the oil level in the reservoir.
- Turn the steering wheel slowly and evenly several times.
Check oil level and adjust if necessary.
- Switch off the engine.
3. Removing steering wheel module
4. Power steering balance check.
- Checking balance when turning wheel to right:
Turn steering wheel nearly to the right limit position.
Connect a torque wrench 999 8081 to steering wheel center.
Turn the torque wrench slowly to the right and read off the torque just as the manometer reaches 1.2 MPA (170.7 psi).
NOTE: It is very important that the reading is taken at exactly 1.2 MPa (170.7 psi) because the pressure remains even when the torque decreases.
- Checking balance when turning wheel to left.
Turn steering wheel to the left read torque in the same way as for the right side.
- Interpreting the torque measurements.
The torque should be 3.5-4.5 Nm (2.6-3.3 ft. lbs.).
The difference may be no more than 1.0 Nm (0.7 ft. lbs.) at most between right and left-hand side.
CAUTION: If the difference is greater the steering gear must be reconditioned or replaced.
5. Checking pump pressure:
- Checking the pump pressure at the left limit position:
Start the engine and check pump pressure.
Turn steering wheel to left and press it against limit position for a maximum of 10 seconds and read the manometer at the same time.
Correct pressure: 9.3-10.0 MPa (1320-1420 psi).
- Checking the pump pressure at the right limit position.
Turn steering wheel to the right limit position and read off the manometer as before.
- Check pump capacity if a fault arises.
Shut the cock for a maximum of 10 seconds.
If the pump is not faulty the pressure should rise to the correct value.
Stop the engine.
6. Installing steering wheel module.
7. Remove the test instrument and connect the pressure pipe to the pump.
- Disconnect the test instrument and nipples and connect the pressure pipe to the pump
Use new aluminum washers.
Tighten pressure pipe pipe screws to 30 Nm (22.1 ft.lb).
8. Start the engine, turn the steering wheel between right and left limit positions.
- Check the oil level in the reservoir.
Adjust oil level if required.
- Transmission oil grade:
ATF oil type F. G.
Dexron II D, E, III
Ford Mercon
Volvo synthetic ATF oil, P/N 1 161 317-1.
- Switch off the engine.