Power Steering Pump: Inspection

Measure the oil clearance between the vane pump shaft and bushing. Using a micrometer and caliper gauge, measure the oil clearance. See Fig 1. See OIL CLEARANCE . If it is more than maximum, replace the front housing and vane pump shaft.

Fig 1: Measuring Oil Clearance
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Inspect the vane pump rotor and vane plates. Using a micrometer, measure height, thickness and length of the 10 plates. See Fig 2. See VANE PLATE MEASUREMENTS .

Fig 2: Inspecting Vane Plates
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Using a feeler gauge, measure the clearance between the rotor groove and plate. See Fig 3. See ROTOR GROOVE & PLATE CLEARANCE . If more than maximum, replace the plate and/or rotor with one having the same mark stamped on the cam ring (inscribed mark: 1, 2, 3, 4 or None). There are 5 vane lengths with the following rotor and cam ring marks. See Fig 4. See VANE LENGTHS .

Fig 3: Measuring Rotor Groove Clearance
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Fig 4: Identifying Vane Length
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Inspect the flow control valve. Coat the valve with power steering fluid and check that it falls smoothly into the valve hole by its own weight. See Fig 5. Check the valve for leakage. Close one of the holes and apply 57-71 psi (392-490 kPa, 4-5 kg/cm² ) of compressed air into the opposite side, and confirm that air does not come out from the end holes. See Fig 6. If necessary, replace the valve with one having the same letter as inscribed on the front housing (mark: A, B, C, D, E or F). See Fig 7.

Fig 5: Inspecting Flow Control Valve
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Fig 6: Inspecting Flow Control Valve Leakage
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Fig 7: Identifying Flow Control Valve Mark
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Inspect the spring. Using calipers, measure the free length of the spring. See Fig 8. See SPRING FREE LENGTH . If it is not within the specification, replace the spring.

Fig 8: Measuring Spring Free Length
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CAUTION: Make sure not to damage the front housing. Make sure you install the oil seal facing the correct direction.

Fig 9: Removing Oil Seal

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Fig 10: Installing New Oil Seal

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If necessary replace the oil seal. Using a screwdriver with vinyl tape wound around the tip, remove the oil seal. See Fig 9. Coat a new oil seal lip with power steering fluid. Using the Replacer Set: Replacer 33 and the Handle Set: Handle 100 (SST 09950-60010, 09951-0030, 09950-70010, 09951-07100), press in the oil seal. See Fig 10.

OIL CLEARANCE

Oil Clearance	In. (mm)
Standard	0.0012-0.0020 (0.03-0.05)
Maximum	0.0028 (0.07)

VANE PLATE MEASUREMENTS

Minimum	In. (mm)
Height	0.339 (8.6)
Thickness	0.05500 (1.397)
Length	0.59016 (14.991)

ROTOR GROOVE & PLATE CLEARANCE

Clearance	In. (mm)
Maximum	0.00138 (0.035)

VANE LENGTHS

Rotor & Cam Ring Mark	Vane Plate Part Number	Vane Length In. (mm)
None	44345-26010	0.59051-0.59059 (14.999-15.001)
1	44345-26020	0.59043-0.59051 (14.997-14.999
2	44345-26030	0.59035-0.59043 (14.995-14.997)
3	44345-26040	0.59027-0.59035 (14.993-14.995)
4	44345-26050	0.59020-0.59027 (14.991-14.993)

SPRING FREE LENGTH

Minimum	In. (mm)
Free Length	1.272 (32.3)