Mustang GT V8-4.6L SOHC VIN X (1998)
Power Steering Pump: Testing and Inspection
Preliminary Inspection
Before performing the pump flow and pressure test, complete the following checks for conditions which could cause loss of power assist. Take
corrective action if necessary.
1. Check power steering oil reservoir for proper fluid level.
2. Check tires for correct air pressure.
3. Check drive belt for proper tension.
4. Check power steering pump for correct model and vehicle application.
5. Check for correct size power steering pump pulleys on power steering pump and engine.
6. Check entire system for damage. Replace parts as necessary.
If the above items are correct or have been corrected and the loss of assist still exists, test the power steering pump flow and pressure to determine
whether the trouble is in the power steering pump or hoses.
Procedure
1. To connect the analyzer into the steering system, remove the pressure fitting from the power steering pump and connect it into the appropriate
adapter of the analyzer.
2. Thread the other adapter of the analyzer into the power steering pump.
3. Connect the analyzer to the adapters. Tighten both connections to 20 Nm (15 ft. lbs.) maximum.
4. Add specified power steering fluid to the power steering pump if required. Start the engine and run it for approximately two minutes at idle.
5. Record the following:
a. Minimum pump flow liters/minute (gallon/minute) at 78° ± 2°C (172° ± 5°F)
b. System Back Pressure kPa (psi) at 78° ± 2°C (172° ± 5°F) at idle with the gate valve fully open
6. Partially close the gate valve to build up 5100 kPa (740 psi). Observe and record minimum pump flow liters/minutes (gallon/minute) at 78° ± 2°C
(172° ± 5°F).
7. Completely close and partially open the gate valve three times. (Do not allow the valve to remain closed for more than five seconds.) Observe and
record pressure, kPa (psi).