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Home >> Lexus >> 2006 >> SC 430 V8-4.3L (3UZ-FE) >> Repair and Diagnosis >> Steering and Suspension >> Steering >> Steering Gear >> Service and Repair >> Part 1

Part 1












OVERHAUL

NOTICE:
^ Do not remove the steering wheel assembly before removing the rack & pinion power steering gear removal. There is a possibility that the spiral cable may break.
^ When installing the rack & pinion power steering gear, apply power steering fluid or molybdenum disulfide lithium base grease to the parts indicated by arrows.

1. PRECAUTION
2. DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL

CAUTION: Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to prevent vent airbag and seat belt pretensioner activation.

3. PLACE FRONT WHEELS FACING STRAIGHT AHEAD
4. REMOVE FRONT WHEEL
a. Remove the 20 bolts and ornaments.
b. Remove the 10 nuts and front wheels.
5. REMOVE SWITCH & VOLUME CASE
6. REMOVE STEERING PAD SWITCH MODULATOR
7. REMOVE STEERING WHEEL COVER LOWER NO. 2
8. REMOVE HORN BUTTON ASSEMBLY
9. REMOVE STEERING WHEEL ASSEMBLY
SST 09950-50013 (09951-05010, 09952-05010, 09953-05020, 09954-05021)





10. DISCONNECT TIE ROD ASSEMBLY LH
a. Remove the 2 bolts and caliper.
b. Support the brake caliper securely.
c. Remove the clip and nut.





d. Using SST, disconnect the tie rod end from the lower ball joint.
11. DISCONNECT TIE ROD ASSEMBLY RH

HINT: Use the same procedures described for the LH side.

12. REMOVE ENGINE UNDER COVER NO. 2





13. REMOVE FRONT SUSPENSION MEMBER BRACE REAR RH
a. Remove the bolt, nut and brace.





14. REMOVE FRONT SUSPENSION MEMBER BRACE REAR LH
a. Remove the bolt, nut and brace.





15. REMOVE FRONT SUSPENSION MEMBER BRACE SUB-ASSEMBLY
a. Remove the 4 bolts and brace.





16. SEPARATE STEERING SLIDING YOKE SUB-ASSEMBLY
a. Place matchmarks on the steering sliding yoke and control valve shaft.
b. Loosen the bolt labeled A, remove the bolt labeled B and disconnect the steering sliding yoke.





17. SEPARATE PRESSURE FEED TUBE ASSEMBLY
a. Pressure feed tube: Remove the union bolt and gasket.
b. Return tube: Remove the union bolt and 2 gaskets.

HINT: When the tool cannot be easily inserted, loosen the 4 rack & pin ion power steering gear set bolts. Then slide the rack & pinion power steering gear rearward slightly.

18. REMOVE RACK & PINION POWER STEERING GEAR ASSEMBLY
a. Remove the 2 bolts and disconnect the 2 tube clamps.
b. Disconnect the connector.
c. Remove the 4 gear set bolts and rack & pinion power steering gear.
d. Remove the steering rack housing bracket No. 2 and grommet.





19. FIX RACK & PINION POWER STEERING GEAR ASSEMBLY
a. Using SST, remove the steering right turn pressure tube and steering left turn pressure tube.
SST 09023-38200
b. Remove the steering turn pressure tube union seat from the power steering rack housing.





c. Using SST, secure the rack & pinion power steering gear in a vise as shown in the illustration.
SST 09612-00012





20. REMOVE TIE ROD ASSEMBLY LH
a. Place matchmarks on the tie rod LH and rack end.
b. Loosen the lock nut, and remove the tie rod LH lock nut.
21. REMOVE TIE ROD ASSEMBLY RH

HINT: Use the same procedures described for the LH side.





22. INSPECT TIE ROD ASSEMBLY LH
a. Secure the tie rod LH in a vise.
b. Install the nut to the stud bolt.
c. Flip the ball joint stud back and forth 5 times.
d. Using a torque wrench, turn the nut continuously at a rate of 2 to 4 seconds per turn and take the torque reading of the 5th turn.
Turning torque: 0.49 to 3.43 Nm (5.0 to 35 kgf-cm, 4.34 to 30.38 inch lbs.)
23. INSPECT TIE ROD ASSEMBLY RH

HINT: Use the same procedures described for the LH side.

24. REMOVE STEERING RACK BOOT CLIP
a. Remove the 2 boot clips.





25. REMOVE STEERING RACK BOOT NO. 1 CLAMP
a. Using pliers, loosen the clamp as shown in the illustration.

NOTICE: Be careful not to damage the steering rack boot.

26. REMOVE STEERING RACK BOOT NO. 2 CLAMP

HINT: Use the same procedures described for the boot No. 1 clamp.

27. REMOVE STEERING RACK BOOT NO. 1
a. Remove the clip and rack boot.

HINT: Mark the No. 1 and No. 2 rack boots.

28. REMOVE STEERING RACK BOOT NO. 2

HINT: Use the same procedures described for the steering rack boot No. 1.





29. REMOVE STEERING RACK END SUB-ASSEMBLY
a. Using a screwdriver and hammer, unstake the washer.

NOTICE: Avoid any impact to the steering rack.





b. Using a wrench, hold the steering rack steadily. Using SST, remove the rack end.
SST 09922-10010

NOTICE: Rotate SST in the direction shown in the illustration.

c. Use the same procedure described for the other side.

HINT: Mark the RH and LH rack ends.

30. REMOVE STEERING RACK END CLAW WASHER
a. Remove the 2 steering rack end claw washers.





31. REMOVE RACK GUIDE
a. Using SST, remove the cap nut.
SST 09922-10010

NOTICE: Rotate SST as shown in the illustration.

b. Remove the spring cap, rack guide spring, conical spring washer and rack guide.
c. Remove the rack guide seat from the rack guide.





32. REMOVE POWER STEERING CONTROL VALVE
a. Remove the steering gear dust cover.
b. Place the matchmarks on the control valve housing and rack housing.
c. Remove the 2 bolts.
d. Pull out the control valve with the control valve housing.
e. Remove the O-ring from the rack housing.





f. Using SST, loosen the bearing guide nut.
SST 09631-20060





g. Wind vinyl tape around the control valve shaft.
h. Using a plastic-faced hammer, tap out the control valve (with bearing guide nut) from the control valve housing.

NOTICE: Be careful not to damage the oil seal lip.

i. Remove the bearing guide nut from the power steering control valve.

NOTICE: Be careful not to damage the oil seal lip.

j. Remove the O-ring from the bearing guide nut.





k. Using a screwdriver, remove the 4 control valve rings from the control valve.

NOTICE: Be careful not to damage the grooves of the control valve ring.





33. REMOVE POWER STEERING CONTROL VALVE UPPER OIL SEAL
a. Using SST, press out the oil seal and bearing from the control valve housing.
SST 09950-60010 (09951-00260), 09950-70010 (09951-07150)





34. REMOVE POWER STEERING CONTROL VALVE LOWER OIL SEAL
a. Using SST, press out the oil seal from the bearing guide nut.
SST 09950-60010 (09951-00320), 09950-70010 (09951-07100)





35. INSPECT POWER STEERING CONTROL VALVE
a. Check the bearing rotation condition and check for abnormal noise.
If the bearing is worn or damaged, replace the control valve.
b. Coat the bearing with molybdenum disulfide lithium base grease.





36. REMOVE CYLINDER END STOPPER
a. Using SST, remove the stopper.
SST 09631-20090
b. Remove the O-ring from the stopper.





37. INSPECT CYLINDER END STOPPER
a. Check the inside of the bushing of the stopper for cracks.
If faulty, replace the bushing.
b. Apply molybdenum disulfide lithium base grease to the inside of the bushing.





38. REMOVE POWER STEERING RACK
a. Using SST, press out the steering rack, housing spacer and rack housing oil seal.

NOTICE: Take care not to drop the power steering rack.

b. Remove the cylinder housing spacer and rack housing oil seal from the steering rack.





39. REMOVE POWER STEERING CYLINDER TUBE OIL SEAL
a. Install SST (09612-07130) on SST (09612-07210).
SST 09612-70100 (09612-07130, 09612-07210)

NOTICE:
^ Before using SSTs, apply a small dab of grease to the inside wall of SSTs (09612-07210, 09612-07130).
^ To prevent the inside of the housing from being dam aged, securely install SSTs together.





b. Diagonally insert SST (09612-07210) into the housing until it contacts with the oil seal, and then further insert SST (09612-07210) until the tip of SST (09612-07220) contacts with SST (09612-07130).

NOTICE: Do not damage the inside of the housing.





c. Secure SST (09612-07220), and pull SST (09612-07210) to place SST (09612-07130) in the housing.

HINT: Place SST on the chamfering position between the oil seal and rack housing.

d. Remove SST (09612-07210, 09612-07220).





e. After installing SST (09612-07240) on SST (09612-07210), insert the tip of SST (09612-07230) in the service hole of SST (09612-07130).

NOTICE:
^ Before using SSTs, apply a small dab of grease to the tip of SSTs (09612-07230).
^ To prevent SST (09612-07130) from being damaged, be sure to install SST (09612-07240).
^ Do not damage the inside of the rack housing.





f. Install SST (09951-07100) on SST (09612-07230) and remove the oil seal using a press.

NOTICE: Do not damage the rack housing.

HINT: Replace SST (09951-07100) with SST that is different in length in the set, if necessary.





40. REMOVE POWER PISTON OIL SEAL
a. Using a screwdriver, remove the oil seal and O-ring from the steering rack.

NOTICE: Be careful not to damage the groove of the oil seal.





41. INSPECT POWER STEERING RACK
a. Using a dial indicator, check for runout of the steering rack and teeth wear.
Maximum runout: 0.03 mm (0.0118 inch)
If runout exceeds the maximum, replace the rack & pinion power steering gear.
b. Check the back surface for wear and damage.
If the steering rack is worn or damaged, replace the rack & pinion power steering gear.





42. INSPECT POWER STEERING CONTROL VALVE LOWER BEARING
a. Check the bearing of the rack housing for pit-marks or damage.
If faulty, replace the rack & pinion power steering gear.





43. INSTALL POWER PISTON OIL SEAL
a. Coat a new O-ring with power steering fluid and install it on the steering rack.
b. Expand a new oil seal with your fingers.

NOTICE: Be careful not to overexpand the oil seal.

c. Coat the teflon ring with power steering fluid.





d. Install the power piston oil seal to the power steering rack's groove. Grip the ring to press it into the groove.





44. INSTALL POWER STEERING RACK HOUSING OIL SEAL
a. Apply power steering fluid to a new oil seal, and install the oil seal on the rack housing at an angle.

NOTICE: Install the oil seal in the correct direction.

HINT: Install the oil seal so that the port faces downward approximately 15 degrees.

b. Using SST, push in the oil seal by hand until it passes through the 2 ports.
SST 09631-00180, 09950-70010 (09951-07360)

NOTICE: Do not turn SST when inserting the oil seal.





c. Using SST, push in the oil seal by hand until it becomes level.
SST 09950-60010 (09951-00490), 09950-70010 (09951-07360)

NOTICE: When SST is set, do not damage the inside surface of the rack housing.





d. Using SST and a press, install the oil seal.
SST 09950-60010 (09951-00490), 09950-70010 (09951-07360)





45. INSTALL POWER STEERING CYLINDER TUBE OIL SEAL
a. Install SST to the power steering rack.
SST 09631-20102

HINT: If necessary, scrape the burrs off the rack teeth end and burnish.

b. Coat SST and the power piston seal with power steering fluid.
c. Install the steering rack to the power steering rack housing.

NOTICE: Be careful not to damage the oil seal lip.

d. Remove SST.
SST 09631-20102





e. Coat SST with power steering fluid.
f. Install SST to the steering rack opposite end.
g. Coat a new oil seal lip with power steering fluid, and install the oil seal by pushing it without tilting it.

NOTICE:
^ Make sure that the oil seal is installed facing the correct direction.
^ Be careful not to damage the oil seal lip.

h. Remove SST.





i. Using SST and a hammer, tap in the power steering cylinder housing spacer.
SST 09950-60010 (09951-00280, 09951-00420, 09952-06010), 09950-70010 (09951-07200)

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