steering LEXUS SC400 1991 Service Repair Manual

MANUAL TILT AND MANUAL
TELESCOPIC STEERING COLUMN
SR0EP±07
(SC300)
COMPONENTS
SR±12±
STEERING STEERING COLUMN
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SECTIONAL VIEW
SR0EQ±02
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STEERING STEERING COLUMNSR±13
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STEERING COLUMN DISASSEMBLY
SR0ER±03
NOTICE: When placing the breakaway bracket in a vise
during disassembly or assembly of the steering column,
use aluminum, 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 COLUMN 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 2 tapered±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 clamp.
SR±14
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5. REMOVE TURN SIGNAL BRACKET
6. REMOVE PROTECTOR
7. REMOVE CONNECTOR BRACKET
8. REMOVE TELESCOPIC LEVER SERRATIONATTACHMENT
Remove the nut and the serration attachment.
9. REMOVE TELESCOPIC LEVER
(a) Remove the bolt, collar, lever and washer.
(b) Remove the ball and compression spring.
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10. REMOVE TELESCOPIC LEVER LOCK BOLTInstall a double nut on the lock bolt, then remove the lock bolt.
11. REMOVE BREAKAWAY BRACKET
(a) Remove the steering column tube stopper bolt.
(b) Using snap ring pliers, remove the snap ring from the main shaft.
(c) Remove the breakaway bracket from the main shaft. Be careful the spline part of the main shaft does not come
loose.
12. REMOVE 2 LOCK WEDGES FROM BREAKAWAY BRACKET
13. REMOVE STEERING SHAFT THRUST STOPPER
14. REMOVE COMPRESSION SPRING
(a) Using a torx wrench, remove the bolt and spring. Torx wrench: T30 (Part No. 09042±00010 or locally manufac-
tured tool)
(b) Remove the 2 bushings from the spring.
SR±16
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15. REMOVE 3 TENSION SPRINGS
16. REMOVE TILT LEVER RETAINERS
(a) Using a hexagon wrench to hold the tilt memory bolt, removethe nut.
(b) Remove the nut and washer.
(c) Pull out the bolt.
(d) Remove the 2 E±rings and the spacer from the tilt lever lock shaft.
(e) Remove the 2 nuts from the tilt steering bolts.
(f) Remove the 2 tilt lever retainers.
(g) Remove the collar from the tilt memory bolt.
17. REMOVE RH TILT PAWL, PAWL STO PPER AND TILT
LEVER
18. REMOVE LH TILT PAWL, PAWL STOPPER, TILT SUB LEVER, TILT LEVER ASSEMBLY AND TILT LEVER LOCK
SHAFT
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19. REMOVE UPPER COLUMN TUBE
(a) Set SST, the nut (10 mm diameter, 1.25 mm pitch), platewasher (36 mm outer diameter) and bolt (10 mm diameter,
1.25 mm pitch, 50 mm length), as shown.
And then remove the 2 tilt steering bolts.
SST 09910±00015 (09911±00011, 09912±00010)
(Reference)
Nut 90170±10004
Plate washer 90201±10201
Bolt 91111±51050
(b) Remove the upper column tube from the lower column tube.
20. REMOVE TILT MEMORY BOLT Using a hexagon wrench, remove the tilt memory bolt and
square nut.
21. 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.
SR±18
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(b) Remove the main shaft from the column tube.
(c) Remove the spring, thrust collar and bearing.
STEERING COLUMN INSPECTION AND
REPLACEMENT
SR0ES±03
1. INSPECT KEY CYLINDERCheck that the steering lock mechanism operates properly.
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 key cylinder.
(c) 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.
STEERING COLUMN ASSEMBLY
SR0ET±04
1. APPLY MOLYBDENUM DISULPHIDE LITHIUM BASEGREASE (See page SR±12)
2. INSTALL MAIN SHAFT
(a) Install the bearing, thrust collar and spring to the main shaft.
(b) Install the main shaft into the upper column tube.
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(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 MEMORY BOLT
(a) Install the square nut and tilt memory bolt.
(b) Using a hexagon wrench, torque the tilt memory bolt.
Torque: 6.4 N Vm (65 kgf Vcm, 56 in. Vlbf)
4. SELECT TILT STEERING BOLTS
Select the bolt with the plain thread end when the upper col-
umn tube mark is 2, and the bolt with the hollow±tipped
thread end when the mark is 1.
5. INSTALL MAIN SHAFT WITH UPPER COLUMN TUBE
(a) Install the main shaft with the upper column tube into the lower column tube.
(b) Using a vise, press in the 2 tilt steering bolts. HINT: Make sure the upper tube turns smoothly.
SR±20
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6. INSTALL TILT LEVER LOCK SHAFT, TILT LEVERASSEMBLY, TILT SUB LEVER AND TILT LEVER
(a) Install the tilt lever lock shaft into the upper column tube.
(b) Install the tilt lever assembly.
(c) Install the tilt lever and tilt sub lever.
7. INSTALL TILT PAWLS
(a) Install the 2 tilt pawls to the upper column tube. HINT: Install the pawl pin into the long hole of the tilt lever and
tilt sub lever.
(b) Install the bolt through the tilt pawls and tilt lever assembly.
(c) Temporarily install the washer and nut.
(d) Install and torque the tilt lever assembly installation bolt.
Torque: 2.9 N Vm (30 kgf Vcm, 26 in. Vlbf)
8. ENGAGE AND ADJUST TILT PAWL
(a) Engage the tilt sub lever side pawl to the center of the ratchet.
(b) While turning the tilt lever side collar, completely engage the
tilt lever side pawl to the ratchet.
(c) Place matchmarks on the pawl and collar.
(d) Remove the nut and washer.
(e) Pull out the bolt.
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