LEXUS SC400 1991 Service Repair Manual

STEERING COLUMN DISASSEMBLY
SR0EL±04
NOTICE: When placing the breakaway bracket in a vise during
disassembly or assembly of the steering column, use alumi-
num, etc. to prevent scratches to the tip of the capsule.
1. REMOVE IGNITION KEY CYLINDER ILLUMINATION
2. REMOVE SLIDING YOKE Place matchmarks on the sliding yoke and main shaft.
3. REMOVE LOWER DUST COVER
(a) Remove the clip and dust cover.
(b) Using a screwdriver, remove the dust seal.
4. REMOVE TELESCOPIC POSITION SENSOR PLATE
5. REMOVE TILT AND TELESCOPIC POSITION SENSORS
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6. REMOVE TURN SIGNAL BRACKET
7. REMOVE NO. 1 PROTECTOR AND NO. 2 PROTECTOR
8. REMOVE CONNECTOR BRACKET
9. REMOVE UPPER BRACKET
(a) U s i n g a c e n t e r i n g p u n c h , m a r k t h e c e n t e r o f t h e 2tapered±head bolts.
(b) U s i n g a 4 ± 5 m m ( 0 . 16±0.20 in.) drill, drill into the 2
tapered±head bolts.
(c) Using a screw extractor, remove the 2 tapered±head bolts.
(d) Remove the bracket and column upper camp.
SR±30
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10. REMOVE TILT STEERING GEAR ASSEMBLY WITHMOTOR
(a) Remove the 2 nuts, spacers, springs, bushings and bond cable.
(b) Set SST and plate washer (36 mm outer diameter), as shown, and then remove the 2 No. 2 tilt steering shafts.
SST 09213±54015 (09214±00030)
09910±00015 (09911±00011, 09912±00010)
(Reference) Plate washer 0 90201±10201
(c) Remove the tilt steering gear assembly.
(d) Remove the 2 bushings and support stopper bolts.
11. REMOVE COLUMN UPPER TUBE WITH MAIN SHAFT
(a) Set SST and plate washer (36 mm outer diameter), as shown, and then remove the 2 tilt steering shafts.
SST 09213±54015 (09214±00030)
09910±00015 (09911±00011, 09912±00010)
(Reference) Plate washer 0 90201±10201
(b) Using snap ring pliers, remove the snap ring from the main shaft.
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(c) Remove the upper tube and main shaft from the lower tube.
12. REMOVE TILT STEERING HOUSING SUPPORT
13. REMOVE MAIN SHAFT ASSEMBLY
(a) Secure the column upper tube in a vise.
NOTICE: Do not tighten the vise too tight.
(b) Using SST, compress the compression spring.SST 09950±20017 (09956±00010)
(c) Using snap ring pliers, remove the snap ring.
(b) Remove the main shaft from the upper tube.
(c) Remove the spring, thrust collar and bearing.
STEERING COLUMN INSPECTION AND
REPLACEMENT
SR0EM±03
1. INSPECT KEY CYLINDER Check that the steering lock mechanism operates properly.
SR±32
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2. IF NECESSARY, REPLACE KEY CYLINDER
(a) Place the ignition key at the ACC position.
(b) Push down the stop pin with a thin rod, and pull out the keycylinder.
(d) Install a new key cylinder. HINT: Make sure the ignition key is at the ACC position.
3. INSPECT UPPER BEARING Check the upper bearing rotation condition and check for ab-
normal noise.
If the bearing is worn or damaged, replace the column upper
tube.
4. IF NECESSARY, ADJUST TELESCOPIC ADJUSTING SCREWS
(a) Using SST, remove the lock nuts.
SST 09617±14010
(b) Using SST, tighten the adjusting screws. SST 09923±00010
Torque: 6.9 N Vm (70 kgf Vcm, 64 in. Vlbf)
NOTICE:
w If the adjusting screw is tightened higher than the
specified torque, the telescopic mechanism may
malfunction. Conversely, if the torque applied is too low,
rattling may develop in the column, so the specified
torque should always be applied.
w When the adjusting screw and conical springs have been
removed, replace the conical springs facing in the
direction shown in the illustration.
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(c) Using SST, install the lock nuts.SST 09617±14010, 09923±00010
Torque: 31 N Vm (320 kgf Vcm, 23 ft Vlbf)
HINT: Use a torque wrench with a fulcrum length of 340 mm
(13.39 in.).
STEERING COLUMN ASSEMBLY
SR0EN±03
1. APPLY MOLYBDENUM DISULPHIDE LITHIUM BASE
GREASE
(See page SR±27)
2. INSTALL MAIN SHAFT
(a) Install the bearing, thrust collar and spring to the main shaft.
(b) Install the main shaft into the upper tube.
(c) Using SST to compress the compression spring. SST 09950±20017 (09956±00010)
(d) Using snap ring pliers, install a new snap ring.
3. INSTALL TILT STEERING HOUSING SUPPORT
Torque: 13 N Vm (130 kgf Vcm, 9 ft Vlbf)
4. INSTALL COLUMN UPPER TUBE WITH MAIN SHAFT
(a) Install the upper tube and main shaft into the lower tube.
SR±34
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(b) Using snap ring pliers, install the snap ring to the main shaft.
(c) Using a vise, press in the 2 tilt steering shafts.HINT: Make sure the upper tube turns smoothly.
5. INSTALL TILT STEERING GEAR ASSEMBLY WITH MOTOR
(a) Install the 2 bushings and support stopper bolts.
(b) Using a vise, press in the 2 No. 2 tilt steering shafts.
(c) Install the bushing, spring and spacer to each stopper bolt.
(d) Install the bond cable.
(e) Install and torque 2 new lock nuts.
Torque: 2.9 N Vm (30 kgf Vcm, 26 in. Vlbf)
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6. INSTALL UPPER BRACKET
(a) Install the upper bracket with 2 new tapered±head bolts.
(b) Tighten the tapered±head bolts until the bolt heads break off.
7. INSTALL CONNECTOR BRACKET
Torque: 4.9 N Vm (50 kgf Vcm, 43 in. Vlbf)
8. INSTALL NO. 1 PROTECTOR AND NO. 2 PROTECTOR
9. INSTALL TURN SIGNAL BRACKET
Install the turn signal bracket so that its upper surface is par-
allel with upper surface of the capsule of the breakaway
bracket.
10. INSTALL TILT AND TELESCOPIC POSITION SENSORS
SR±36
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11. INSTALL TELESCOPIC SENSOR PLATE
Torque: 4.9 NVm (50 kgf Vcm, 43 in. Vlbf)
12. INSTALL LOWER DUST COVER
(a) Using a press, install the dust seal.
(b) Install the lower dust cover and clip.
13. INSTALL SLIDING YOKE
Align matchmarks and install the sliding yoke to the main
shaft.
Torque: 35 N Vm (360 kgf Vcm, 26 ft Vlbf)
14. INSTALL IGNITION KEY CYLINDER ILLUMINATION
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±MEMO± SR±38
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