Lexus SC300 / Lexus SC400. Manual — part 746
(b) Remove the side rear plate.
(c) Remove the O–ring from side rear plate.
(d) Remove the cam ring, rotor and the 10 vane plates.
(e) Remove the straight pin from the side front plate.
(f)
Remove the 2 O–rings from the side front plate.
(g) Remove the straight pin from the front housing.
HINT: Place a workshop rag over the pin to prevent damaging
it.
POWER STEERING PUMP INSPECTION
SR0G8–02
1.
MEASURE OIL CLEARANCE OF SHAFT AND BUSHING
Using a micrometer and calipers, measure the oil clearance.
Standard clearance:
0.01–0.03 mm (0.0004–0.00012 in.)
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STEERING
POWER STEERING
SR–123
Maximum clearance:
0.07 mm (0.0028 in.)
If more than maximum, replace the entire power steering
pump.
2.
INSPECT ROTOR AND VANE PLATES
(a) Using a micrometer, measure the height, thickness and
length of the vane plates.
Minimum height:
8.0 mm (0.315 in.)
Minimum thickness:
1.77 mm (0.0697 in.)
Minimum length:
14.97 mm (0.5894 in.)
(b) Using a feeler gauge, measure the clearance between the
rotor groove and vane plate.
Maximum clearance:
0.03 mm (0.0012 in.)
If more then maximum, replace the vane plate and/or rotor
with one having the same mark stamped on the cam ring.
Inscribed mark:
1, 2, 3, 4 or None
HINT: There are 5 vane lengths with the following rotor and
cam ring marks:
ÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑ
Rotor and cam
ring number
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
Vane length mm (in.)
ÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑ
None
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
14.996–14.998 (0.59039–0.59047)
ÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑ
1
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
14.994–14.996 (0.59031–0.59039)
ÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑ
2
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
14.992–14.994 (0.59023–0.59031)
ÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑ
3
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
14.990–14.992 (0.59016–0.59024)
ÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑ
4
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ
14.988–14.990 (0.59007–0.59016)
3.
INSPECT FLOW CONTROL VALVE
(a) Coat the valve with power steering fluid and check that it falls
smoothly into the valve hole by its own weight.
SR–124
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STEERING
POWER STEERING
(b) Check the flow control valve for leakage.
Close one of the holes and apply compressed air 392 –490
kPa (4–5 kgf/ cm
2
, 57–71 psi) into the opposite side, and con-
firm that air does not come out from the end holes.
If necessary, replace the valve with one having the same let-
ter as inscribed on the front housing.
Inscribed mark:
A, B, C, D, E or F
4.
INSPECT FLOW CONTROL SPRING
Using a calipers, measure the free length of the spring.
Minimum spring length:
36 mm (1.42 in.)
If not within specification, replace the spring.
5.
IF NECESSARY, REPLACE OIL SEAL
(a) Using SST, tap out the oil seal.
SST 09631–10030
(b) Using a 22 mm socket wrench and hammer, drive in a new
oil seal.
NOTICE: Make sure you install the oil seal facing the correct
direction.
(c) Coat the oil seal lip with power steering fluid.
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STEERING
POWER STEERING
SR–125
6.
IF NECESSARY, REPLACE BEARING
(a) Using snap ring pliers, remove the snap ring.
(b) Using a press, press out the bearing.
(c) Using a press, press in a new bearing.
(d) Using snap ring pliers, install a new snap ring.
POWER STEERING PUMP ASSEMBLY
SR0G9–02
1. COAT WITH POWER STEERING FLUID BEFORE
ASSEMBLY
(See page SR–120)
2.
INSTALL VANE PUMP SHAFT WITH BEARING
(a) Using SST and a press, press in the pump shaft.
SST 09238–47012
(b) Using snap ring pliers, install a new snap ring.
3.
INSTALL SIDE FRONT PLATE, CAM RING, ROTOR, VANE
PLATES AND SIDE REAR PLATE
(a) Install the longer straight pin to the front housing.
SR–126
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STEERING
POWER STEERING
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