wheel alignment LEXUS SC400 1991 Service User Guide

ADJUSTMENT CHART
SA155±04
HOW TO READ ADJUSTMENT CHART
(a) Mark on the graph the measurements taken from the vehicle.
Example:
Camber +0 31'
Caster +3 56'
(b) As shown in the illustration, read from the graph the amounts
by which the front and/or rear cams are to be adjusted.
Amount to turn adjusting cam (by graduation):
Front cam +(Longer) 1.8
Rear cam ±(Shorter) 2.2
SA±8±
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SUSPENSION AND AXLE WHEEL ALIGNMENTSA±9
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REAR WHEEL ALIGNMENT
SA1A0±01
1. MEASURE VEHICLE HEIGHTRear vehicle height (SC400):
 Tire size Rear
 P225/55R16251.7 mm (9.909 in.)
Rear vehicle height (SC300):
 Tire size Rear
 P215/60R15247.7 mm (9.752 in.)
Measuring point:
Measure from the ground to the center of the lower suspen-
sion arm No.2 mounting bolt.
NOTICE: Before inspecting the wheel alignment, adjust the vehicle height to spe\
cification.If the vehicle height is not standard, try to adjust it by pushing
down on or lifting the body.
2. INSTALL CAMBER±CASTER±KINGPIN GAUGE OR ONTO WHEEL ALIGNMENT TESTER
Follow the specific instructions of the equipment manufactur-
er.
3. INSPECT CAMBER
Camber:
 


Camber
Left±right error 


±0
553 ' + 45 '
30 ' or less
4. INSPECT TOE±IN
Toe±in (total):
A+B 0.4 5 + 0.2 5
C±D 4.5 + 2 mm (0.18 + 0.08 in.)
5. ADJUST CAMBER AND TOE±IN
(a) Measure the length of the lower suspension arm No.1 and
No.2, as shown in the illustration.
SA±10
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Length:(E±F) or (F±E) should be less 4.0 mm.
If not, adjust the length of the arms by turning the adjusting
cam, as shown, until (E±F) or (F±E) is less than 4.0 mm.
(b) Measure the camber and toe±in. Specifications:
 


Camber
Left±right error 


±0

53 ' + 30 '
30' or less
 


Toe±in 


A+B 0.4

+ 0.1

C±D 4.5 + 1 mm (0.18 + 0.04 in.)
If the camber and toe±in are still not within the specification,
adjust the camber and toe±in with the adjusting cam.
(c) Loosen and adjust the No.1 and/or No.2 cams.
(d) Adjust camber and toe±in by turning the No.1 and/ or No.2 cams.
(See adjustment chart )
(e) Torque the No.1 and/or No.2 cam nuts.
Torque: 184 N Vm (1,880 kgf Vcm, 134 ft Vlbf)
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SUSPENSION AND AXLE WHEEL ALIGNMENTSA±11
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ADJUSTMENT CHART
SA0VA±09
HOW TO READ ADJUSTMENT CHART
(a) Mark on the graph the measurements taken from the vehicle.
Example:
Camber (LH) ±1
08 '
Camber (RH) ±0
23 '
Toe±in 12.5 mm (0.49 in.)
(b) As shown the illustration, from the graph the amounts by which the front and/or rear cam are to be adjusted.
Amount to turn adjusting cam (by graduation):
(LH Front cam)
Decrease 0.3 (Shorter)
(LH Rear cam)
Increase 1.7 (Longer)
(RH Front cam)
Increase 2.8 (Longer)
(RH Rear cam)
Increase 1.3 (Longer)
SA±12±
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SUSPENSION AND AXLE WHEEL ALIGNMENTSA±13
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5. CONNECT ABS SPEED SENSOR TO STEERINGKNUCKLE
Connect the sensor to the steering knuckle with the bolt.
Torque: 7.8 N Vm (80 kgf Vcm, 69 in. Vlbf)
6. INSTALL FRONT WHEEL AND LOWER VEHICLE
Torque: 103 N Vm (1,050 kgf Vcm, 76 ft Vlbf)
7. CHECK FRONT WHEEL ALIGNMENT
(See page SA±5)
FRONT WHEEL HUB BOLT
REPLACEMENT
SA1A1±01
1. JACK UP VEHICLE AND REMOVE FRONT WHEEL
2. REMOVE FRONT BRAKE CALIPER AND DISC
(See page SA±30)
3. REMOVE HUB BOLT Using SST, remove the hub bolt.
SST 09628±10011
4. INSTALL HUB BOLT Install a washer and nut to the bolt, as shown in the illustra-
tion, and install a new hub bolt by torquing the nut.
5. INSTALL FRONT BRAKE DISC AND CALIPER (See page SA±36)
6. INSTALL FRONT WHEEL AND LOWER VEHICLE
Torque: 103 N Vm (1,050 kgf Vcm, 76 ft Vlbf)
SA±24±
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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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(b) Install and tighten the bolt.
6. INSTALL FRONT FENDER SPLASH SHIELD
7. INSTALL DISC BRAKE CALIPERInstall the brake caliper to the steering knuckle with the 2
bolts.
Torque: 118 N Vm (1,200 kgf Vcm, 87 ft Vlbf)
8. STABILIZE SUSPENSION
(a) Install the front wheel and lower vehicle.
Torque: 103 N Vm (1,050 kgf Vcm, 76 ft Vlbf)
(b) Bounce the vehicle up and down several times to stabilize the
suspension.
(c) Jack up vehicle and remove the front wheel.
9. TIGHTEN BOLT AND NUT ON LOWER SIDE OF SHOCK ABSORBER
(a) Support the lower arm with a jack.
(b) Tighten the nut to the specified torque.
Torque: 143 N Vm (1,460 kgf Vcm, 106 ft Vlbf)
10. TIGHTEN BOLT AND NUT OF UPPER SUSPENSION ARM
Tighten the bolt and nut to the specified torque.
Torque: 164 N Vm (1,670 kgf Vcm, 121 ft Vlbf)
11. INSTALL FRONT WHEEL AND LOWER VEHICLE
Torque: 103 N Vm (1,050 kgf Vcm, 76 ft Vlbf)
12. CHECK FRONT WHEEL ALIGNMENT
(See page SA±5)
SA±34
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(b) Install and tighten the bolt.
4. INSTALL FRONT FENDER SPLASH SHEILD
5. INSTALL BRAKE CALIPERInstall the brake caliper to the steering knuckle with the 2
bolts.
Torque: 118 N Vm (1,200 kgf Vcm, 87 ft Vlbf)
6. STABILIZE SUSPENSION
(a) Install the front wheel.
Torque: 103 N Vm (1,050 kgf Vcm, 76 ft Vlbf)
(b) Bounce the vehicle up and down several times to stabilize the
suspension.
(c) Jack up the vehicle and remove the front wheel.
7. TIGHTEN BOLT AND NUT OF UPPER SUSPENSION ARM
(a) Support the lower arm with jack.
(b) Torque the bolt and nut the specified torque.
Torque: 164 N Vm (1,670 kgf Vcm, 121 ft Vlbf)
8. INSTALL FRONT WHEEL AND LOWER VEHICLE
Torque: 103 N Vm (1,050 kgf Vcm, 76 ft Vlbf)
9. CHECK FRONT WHEEL ALIGNMENT
(See page SA±5)
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SUSPENSION AND AXLE FRONT SUSPENSIONSA±39
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