Inspection (RAV4)
- Using micrometer, measure diameter of pump shaft. Using calipers, measure diameter or pump housing shaft bushing. Determine amount of clearance. Clearance should be .0012-.0020" (.030-.050 mm). Clearance should not exceed .0028" (.071 mm). If clearance exceeds maximum specification, replace front housing and pump shaft.
- Using micrometer, measure height, thickness and length of 10 vane plates. See VANE PLATE SPECIFICATIONS table. Use feeler gauge to measure clearance between rotor groove and plate. Maximum clearance is .0012" (.030 mm). If clearance exceeds maximum, replace plate and/or rotor with one having same mark stamp of "1", "2", "3", "4" or no marking.
- Coat flow control valve with power steering fluid and check that it falls smoothly into valve hole on its own weight.
- Check flow control valve for leakage by closing one hose and applying 57-71 psi (4-5 kg/cm2) air pressure to opposite hole. Air should NOT come out hole on end of valve. If valve does not respond as indicated, replace valve with one having same letter mark as on front housing and/or on valve.
- Using calipers, measure free length of flow control valve spring. Minimum free length is 1.42" (36.0 mm). If not within specification, replace spring.
- If necessary, replace oil seal. Coat NEW seal lip with power steering fluid and carefully press NEW oil seal into position. Ensure seal is in same direction as removed.
VANE PLATE SPECIFICATIONS
| Application | In. (mm) | |
|---|---|---|
| RAV4 | ||
| Height | .319 (8.1) | |
| Length | .59008 (14.988) | |
| Thickness | .0707 (1.796) | |
| Land Cruiser, Sienna, Tacoma, Tundra & 4Runner | ||
| Height | .339 (8.6) | |
| Length | .5902 (14.991) | |
| Thickness | .0550 (1.397) | |