1991 LEXUS SC300 suspension

REAR SUSPENSION
SA0A4±07
DESCRIPTION
The suspension is double wishbone type at the rear. Optimal suspension geometry and wheel alignment
are achieved through analysis of the component design, materials and characteristics to provide a high
level of controllability and riding comfort.
The support rigidity of the suspension has been realized through the ado\
ption of the rear subframe.
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SUSPENSION AND AXLE REAR SUSPENSIONSA±105
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PREPARATION
SST (SPECIAL SERVICE TOOLS)
SA0A5±02
RECOMMENDED TOOLS
SA06X±03
EQUIPMENT
SA0A7±01
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Torque wrench 


SA±106±
SUSPENSION AND AXLE REAR SUSPENSION
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REAR SHOCK ABSORBER
COMPONENTS
SA0SB±05
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SUSPENSION AND AXLE REAR SUSPENSIONSA±107
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REAR SHOCK ABSORBER REMOVAL
SA0SC±02
1. JACK UP VEHICLE AND REMOVE REAR WHEEL
2. REMOVE REAR BRAKE CALIPER
(a) Remove the 2 bolts and remove the brake caliper from therear axle carrier.
(b) Hang up the brake caliper using wire, etc.
3. REMOVE SHOCK ABSORBER WITH COIL SPRING
(a) Remove the nut and bolt on lower side of the shock absorber.
(b) Remove the absorber cap.
(c) Loosen the nut in the middle of the suspension support.
NOTICE: Only loosen the nut, do not remove it.
(d) Remove the 3 nuts and shock absorber with the coil spring.
SA±108
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SUSPENSION AND AXLE REAR SUSPENSION
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4. REMOVE SUSPENSION SUPPORT AND COIL SPRING
(a) Install a bolt and 2 nuts to the bracket at the lower portion ofthe shock absorber shell and secure it in a vise.
(b) Using SST, compress the coil spring. SST 09727±30020
NOTICE: Do not use an impact wrench.
It will damage the SST.
(c) Remove the suspension support nut.
(d) Remove the suspension support, coil spring and insulator.
(e) R e m o v e t h e i n s u l a t o r a n d s p r i n g b u m p e r f r o m t h e suspension support.
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SUSPENSION AND AXLE REAR SUSPENSIONSA±109
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REAR SHOCK ABSORBER INSPECTION
SA0SD±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.
REAR SHOCK ABSORBER DISPOSAL
SA0SE±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.
REAR SHOCK ABSORBER
INSTALLATION
SA0WB±02
1. INSTALL SUSPENSION SUPPORT AND COIL SPRING
(a) Install the spring bumper to the suspension support.
(b) Install the insulator to the suspension support. HINT: Match the bolt of the suspension support with the cut±
off part of the insulator.
(c) Using SST, compress the coil spring. SST 09727±30020
NOTICE: Do not use an impact wrench.
It will damage the SST.
SA±110
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SUSPENSION AND AXLE REAR SUSPENSION
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(d) 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.
(e) Install the suspension support to the rod and temporarily tighten a new nut.
(f) Rotate the suspension support so that the rod and one of the bolts on suspension support are aligned with the lower
bushing.
(g) Remove the SST. HINT: After removing the SST, again check the direction of
the suspension support.
2. INSTALL SHOCK ABSORBER WITH COIL SPRING TO VEHICLE
(a) Install the shock absorber with the coil spring to the vehicle
with the 3 nuts.
Torque: 25 N Vm (260 kgf Vcm, 19 ft Vlbf)
(b) Torque the temporarily tightened nut in the middle of the
suspension support.
Torque: 27 N Vm (280 kgf Vcm, 20 ft Vlbf)
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SUSPENSION AND AXLE REAR SUSPENSIONSA±111
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3. INSTALL SHOCK ABSORBER TO REAR AXLE CARRIER
(a) Install the bolt from the rear vehicle.
(b) Temporarily install the nut.
4. INSTALL REAR BRAKE CALIPERInstall the brake caliper to the rear axle carrier with the 2 bolts.
Torque: 104 N Vm (1,065 kgf Vcm, 77 ft Vlbf)
5. STABILIZE SUSPENSION
(a) Install the rear wheel and lower vehicle
(b) Bounce the vehicle up and down several times to stabilize the
suspension.
(c) Jack up the vehicle and remove the rear wheel.
6. TIGHTEN BOLT AND NUT
(a) Support the lower arm with a jack.
(b) Tighten the bolt and nut.
Torque: 143 N Vm (1,460 kgf Vcm, 106 ft Vlbf)
7. INSTALL REAR WHEEL AND LOWER VEHICLE
Torqre: 137 N Vm (1,050 kgf Vcm, 101 ft Vlbf)
8. CHECK REAR WHEEL ALIGNMENT
(See page SA±10)
SA±112
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SUSPENSION AND AXLE REAR SUSPENSION
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