ect LEXUS SC300 1991 Service Repair Manual

FRONT SUSPENSION
DESCRIPTION
SA008±04
A double wishbone type independent suspension is used. It ensures the greater design freedom, permits
and ideal wheel alignment selection.
The result is an outstanding straight±forward stability at high speed\
s, turning and braking stability.
Suspension friction is also reduced at each portion of the suspension for good vehi\
cle controllability, stabil-
ity and riding comfort.
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SUSPENSION AND AXLE FRONT SUSPENSIONSA±25
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FRONT SHOCK ABSORBER REMOVAL
SA0RN±04
1. JACK UP VEHICLE AND REMOVE FRONT WHEEL
2. REMOVE BRAKE CALIPER
(a) Remove the 2 bolts and caliper from the steering knuckle.
(b) Hang up the brake caliper using wire, etc.
3. REMOVE FRONT FENDER SPLUSH SHIELD
4. LH side only:MOVE WASHER TANK
(a) Remove the bolt.
(b) Remove the bolt and move the washer tank away from the body.
5. DISCONNECT ABS SPEED SENSOR AND WIRE HARNESS
(a) Remove the bolt and disconnect the speed sensor from the
steering knuckle.
SA±28
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(b) Remove the 3 bolts and disconnect the wire harness clampto prevent the wire harness being damaged when removing
or installing the through bolt.
6. LOOSEN PISTON ROD LOCK NUT
(a) Remove the plug from the support.
(b) Loosen the lock nut in the middle of the suspension support.
NOTICE: Only loosen the nut, do not remove it.
7. DISCONNECT UPPER SUSPENSION ARM
(a) R e m o v e t h e b o l t a n d n u t a n d d i s c onnect the upper
suspension arm from the member.
(b) Hang up the upper suspension arm using wire, etc.
8. REMOVE SHOCK ABSORBER
(a) Remove the bolt and nut and disconnect the shock absorber from the lower suspension arm.
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SUSPENSION AND AXLE FRONT SUSPENSIONSA±29
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FRONT SHOCK ABSORBER
INSPECTION
SA0RQ±03
INSPECT SHOCK ABSORBER
Compress and extend the shock absorber rod and check that
there is no abnormal resistance or unusual operation
sounds.
If there is any abnormality, replace the shock absorber with
a new one.
NOTICE: When discarding the shock absorber, use the
following procedure.
FRONT SHOCK ABSORBER DISPOSAL
SA0RR±03
1. FULLY EXTEND SHOCK ABSORBER ROD
2. DRILL HOLE TO REMOVE GAS FROM CYLINDERUsing a drill, make a hole in the cylinder, as shown to remove
the gas inside.
CAUTION: The gas coming out is harmless, but be care-
ful of chips which may fly up when drilling.
FRONT SHOCK ABSORBER ASSEMBLY
SA0RS±05
1. INSTALL INSULATOR TO SUSPENSION SUPPORT HINT: Match the bolt of the suspension support with the cut±
out part of the insulator.
2. INSTALL SPRING BUMPER TO SHOCK ABSORBER
3. INSTALL COIL SPRING TO SHOCK ABSORBER
(a) Using SST, compress the coil spring. SST 09727±30020
NOTICE: Do not use an impact wrench.
It will damage the SST.
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SUSPENSION AND AXLE FRONT SUSPENSIONSA±31
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(b) Install the coil spring to the shock absorber.HINT: Fit the lower end of the coil spring into the gap of the
spring seat of the shock absorber.
4. INSTALL SUSPENSION SUPPORT
(a) Install the suspension support to the rod.
(b) Temporarily tighten a new nut.
(c) Turn the suspension support so that one of the bolts on the suspension support faces the same direction, as shown in
the illustration.
HINT: Align the bolt so that a line drawn between the rod and
the bolt would be 90 5 to the direction of the lower bushing.
5. REMOVE SST HINT: After removing the SST, again check the direction of
the suspension support.
FRONT SHOCK ABSORBER
INSTALLATION
SA063±05
1. INSTALL SHOCK ABSORBER TO BODY
(a) Install the shock absorber with coil spring to the body with the
3 nuts.
Torque: 35 N Vm (360 kgf Vcm, 26 ft Vlbf)
(b) Torque the temporarily tightened nut in the middle of the
suspension support.
Torque: 29 N Vm (300 kgf Vcm, 22 ft Vlbf)
(c) Install the plug to the suspension support.
SA±32
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2. CONNECT SHOCK ABSORBER TO LOWERSUSPENSION ARM
(a) Connect the shock absorber to lower suspension arm.
(b) Install the bolt from the rear vehicle and temporarily tighten the nut.
3. TEMPORARILY CONNECT UPPER SUSPENSION ARM TO MEMBER
(a) C onnect the upper suspension arm to the suspension
member.
(b) Install the bolt from the front vehicle and temporarily tighten the bolt and nut.
4. CONNECT ABS SPEED SENSOR AND WIRE HARNESS
(a) Clamp the wire harness to the upper suspension arm and body with the 3 bolts.
(b) Connect the speed sensor to the steering knuckle with the bolt.
Torque: 7.8 N Vm (80 kgf Vcm, 69 in. Vlbf)
5. LH side only:
CONNECT WASHER TANK
(a) Install and tighten the bolt.
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SUSPENSION AND AXLE FRONT SUSPENSIONSA±33
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UPPER SUSPENSION ARM REMOVAL
SA1A2±01
1. JACK UP VEHICLE AND REMOVE FRONT WHEEL
2. REMOVE FRONT BRAKE CALIPER AND DISC
(a) Remove the 2 bolts and brake caliper from the steeringknuckle.
(b) Hang up the caliper using wire, etc.
3. REMOVE FRONT FENDER SPLASH SHIELD
4. LH side only: MOVE WASHER TANK
(a) Loosen the bolt.
(b) Remove the bolt and move the washer tank away from the body.
5. REMOVE ABS SPEED SENSOR AND WIRE HARNESS CLAMP
(a) Remove the bolt and disconnect the speed sensor from the
steering knuckle.
SA±36
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(b) Remove the 3 bolts and wire harness clamp to prevent thewire harness being damaged when removing or installing the
through bolt.
6. REMOVE UPPER SUSPENSION ARM
(a) Remove the cotter pin and the nut.
(b) Using SST, disconnect the upper suspension arm from the steering knuckle.
SST 09628±62011
(c) Remove the bolt and nut.
(d) Remove the upper suspension arm.
UPPER BALL JOINT INSPECTION
SA0RU±04
INSPECT BALL JOINT FOR ROTATION CONDITION
(a) As shown, flip the ball joint stud back and forth 5 times before
installing the nut.
(b) Using a torque wrench, turn the nut continuously one turn every 2±4 seconds and take the torque reading on the 5th
turn.
Torque (turning):
1.0±3.4 N Vm (10±35 kgf Vcm, 9±30 in. Vlbf)
If not within specification, replace the upper suspension arm.
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SUSPENSION AND AXLE FRONT SUSPENSIONSA±37
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UPPER SUSPENSION ARM
INSTALLATION
SA1A3±01
1. INSTALL UPPER SUSPENSION ARM
(a) Temporarily install the upper suspension arm to the memberwith the bolt and nut.
(b) Connect the upper suspension arm to the steering knuckle with the nut and a new cotter pin.
Torque: 103 N Vm (1,050 kgf Vcm, 76 ft Vlbf)
2. INSTALL ABS SPEED SENSOR AND WIRE HARNESS
CLAMP
(a) Clamp the wire harness to the upper suspension arm and
body with the 3 bolts.
(b) Install the speed sensor to the steering knuckle with the bolt.
Torque: 7.8 N Vm (80 kgf Vcm, 69 in. Vlbf)
3. LH side only:
CONNECT WASHER TANK
(a) Tighten the bolt.
SA±38
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LOWER SUSPENSION ARM REMOVAL
SA1A4±01
1. JACK UP VEHICLE AND REMOVE FRONT WHEEL
2. REMOVE ENGINE UNDER COVER
3. REMOVE FRONT BRAKE CALIPER
(b) Hang up the brake caliper using wire, etc.
4. DISCONNECT STABILIZER BAR LINK FROM LOWERSUSPENSION ARM
Remove the nut and disconnect the link from the arm.
5. DISCONNECT STEERING KNUCKLE
(a) Remove the clip and nut.
(b) Using SST, disconnect the steering knuckle from the lower suspension arm.
SST 09628±62011
6. REMOVE LOWER SUSPENSION ARM
(a) R e m o v e t h e b o l t a n d n u t a n d d i s c onnect the lower
suspension arm from the shock absorber.
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SUSPENSION AND AXLE FRONT SUSPENSIONSA±41
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