Power Steering Pump: Inspection
- Check all parts for wear or damage and replace as necessary. Check oil clearance between pump housing bushing and rotor shaft. See Fig 1. If difference is greater than .0028" (.07 mm), replace complete pump assembly.
- Check that bearings operate smoothly. If necessary, press out old bearing and press in new bearing.
- Measure difference between cam ring and rotor. Maximum difference should be .0024" (.06 mm). If necessary, replace cam ring with one with the same letter stamped on the rotor.
- Check vane plates for wear or damage. Dimensions of the vane plate should be .589 x .307 x .067" (14.97 x 7.80 x 1.70 mm) for Celica and Supra, or .590 x .319 x .070" (14.99 x 8.10 x 1.79 mm) for Camry, Corolla and Tercel models.
- Maximum clearance between vane plate and rotor groove is .0024" (.06 mm) for Celica and Supra, or .0011" (.028 mm) for Camry, Corolla and Tercel models.
- Check flow control valve for leakage with compressed air. See Fig 2. On Celica and Supra models, control valve spring length should be 1.85" (47 mm) minimum. On all others, control valve spring length should be 1.85-1.97" (47-50 mm).