LEXUS SC400 1991 Service Repair Manual

REAR DIFFERENTIAL
 Rear
diff ti l
 Drive pinion oil seal drive in depth  0 + 0.5 mm differential Drive pinion shaft run out Maximum 0.08 mm (0.0031 in.)  Ring gear runout Maximum 0.05 mm (0.0020 in.)
  Ring gear backlash  0.08 ± 0.18 mm (0.0031 ± 0.0051 in.)
 


 


Drive pinion preload 


 


0.5±0.8 NVm (5±8 kgfVcm, 4.3±6.9
in.Vlbf)
  Total preload (add drive pinion preload  0.5±0.8 NVm (5±8 kgfVcm, 4.3±6.9
in.Vlbf)
 \
 \
Pinion gear backlash (Conventional type) 0.05±0.20 mm (0.0020±0.0079 in.)
 \
 \
Pinion gear backlash adjusting thrust washer
  1.6 mm (0.063 in.) 1.7 mm (0.067 in.) 1.8 mm (0.071 in.)
 \
 \
Ring gear backlash adjusting washer
  No. Thickness mm (in.) No. Thickness mm (in.) No. Thickness mm (in.)
022.02 (0.0795)322.32 (0.0913)622.62 (0.1031)  04 2.04 (0.0803) 34 2.34 (0.0921) 64 2.64 (0.1039)  06 2.06 (0.0811) 36 2.36 (0.0929) 66 2.66 (0.1047)  08 2.08 (0.0819) 38 2.33 (0.0937) 68 2.68 (0.1055)
  10 2.10 (0.0827) 40 2.40 (0.0945) 70 2.70 (0.1063)
  12 2.12 (0.0835) 42 2.42 (0.0953) 72 2.72 (0.1071)
  14 2.14 (0.0843) 44 2.44 (0.0961) 74 2.74 (0.1079)
  16 2.16 (0.0850) 46 2.46 (0.0969) 76 2.76 (0.1087)
182.18 (0.0858)482.48 (0.0976)782.78 (0.1094)  20 2.20 (0.0866) 50 2.50 (0.0984) 80 2.80 (0.1102)  22 2.22 (0.0974) 52 2.52 (0.0992) 82 2.82 (0.1110)  24 2.24 (0.0882) 54 2.54 (0.1000) 84 2.84 (0.1118)
  26 2.26 (0.0890) 56 2.56 (0.1008) 86 2.86 (0.1126)
  28 2.28 (0.0898) 58 2.58 (0.1016)  
  30 2.30 (0.0906) 60 2.60 (0.1024)  
 \
 \
Tooth contact pattern adjusting washer
No.Thickness mm (in.)No.Thickness mm (in.)No.Thickness mm (in.)  87 1.87 (0.0736) 02 2.02 (0.0795) 17 2.17 (0.0854)  88 1.88 (0.0740) 03 2.03 (0.0799) 18 2.18 (0.0858)  89 1.89 (0.0744) 04 2.04 (0.0803) 19 2.19 (0.0862)
  90 1.90 (0.0748) 05 2.05 (0.0807) 20 2.20 (0.0866)
  91 1.91 (0.0752) 06 2.06 (0.0811) 21 2.21 (0.0870)
  92 1.92 (0.0756) 07 2.07 (0.0815) 22 2.22 (0.0874)
  93 1.93 (0.0760) 08 2.08 (0.0819) 23 2.23 (0.0878)
941.94 (0.0764)092.09 (0.0823)242.24 (0.0882)  95 1.95 (0.0768) 10 2.10 (0.0827) 25 2.25 (0.0886)  96 1.96 (0.0772) 11 2.11 (0.0831) 26 2.26 (0.0890)  97 1.97 (0.0776) 12 2.12 (0.0835) 27 2.27 (0.0894)
  98 1.98 (0.0780) 13 2.13 (0.0839) 28 2.28 (0.0898)
  99 1.99 (0.0783) 14 2.14 (0.0843)  
  00 2.00 (0.0787) 15 2.15 (0.0846)  
012.01 (0.0791)162.16 (0.0850)
SA±128±
SUSPENSION AND AXLE SERVICE SPECIFICATIONS
WhereEverybodyKnowsYourName

TORQUE SPECIFICATIONS
SA0WG±03
(FRONT)
\
 \
Part tightened NVm kgf Vcm ft Vlbf
\
 \
Hub nut 103 1,050 76
\
 \
Front and rear adjusting cam bolt 226 2,300 166
\
 \
Axle hub lock nut 199 2,030 147
\
 \
Lower ball joint X Steering knuckle 125 1,270 92
\
 \
Tie rod end X Steering knuckle 49 500 36
\
 \
Steering knuckle X Upper suspension arm 103 1,050 76
\
 \
Lower ball foint X Lower suspension arm 127 1,300 94
\
 \
Disc brake caliper X Steering knuckle 11 8 1,200 87
\
 \
Speed sensor set bolt 103 80 76 in. Vlbf
\
 \
Front shock absorber X Body 35 360 26
\
 \
Front shock absorber X Lower suspension arm 143 1,460 106
\
 \
Upper suspension arm mounting nut 164 1,670 121
\
 \
Piston rod lock nut 29 300 22
\
 \
Stabilizer link X Lower suspension arm 74 750 54
\
 \
Stabilizer link X Stabilizer bar 74 750 54
\
 \
Stabilizer bar bracket X Body 18 180 13
\
 \
Steering knuckle X Disc brake dust cover 19 195 14
(REAR)
\
 \
Part tightened N Vm kgf Vcm ft Vlbf
\
 \
Shock absorber X Lower suspension arm 143 1,460 106\
 \
Upper arm X Body 164 1,670 271\
 \
Rear axle carrier X Brake caliper 104 1,065 77\
 \
No. 1 lower arm X Rear axle carrier 59 600 43\
 \
No. 1 lower arm X Body 184 1,880 136
\
 \
No. 2 lower arm X Rear axle carrier 150 1,525 11 0
\
 \
No. 2 lower arm X Body 184 1,880 136
\
 \
Strut rod X Rear axle carrier 184 1,880 136
\
 \
Strut rod X Body 184 1,880 136
\
 \
Rear drive shaft X Axle hub 289 2,950 213
\
 \
Upper ball joint X Rear axle carrier 109 1,110 80
\
Parking brake backing plate X Rear axle carrier2626019\
 \
Rear drive shaft X Differential 83 850 64\
 
\

\
Differential mounting bolt \
Front
Rear 

147
142 

1,500
1,450 

108
105
\
 \
Differential carrier cover set bolt 47 475 34
\
 \
Suspension support X Body 27 280 20
\
 \
Suspension support X Shock absorber rod 27 280 20
\
 \
Stabilizer bar link nut 74 750 54
\
 \
Stabilizer bar bushing retainer bolt 28 290 21
±
SUSPENSION AND AXLE SERVICE SPECIFICATIONSSA±129
WhereEverybodyKnowsYourName

±MEMO±
WhereEverybodyKnowsYourName

SUSPENSION AND AXLE
SA±1
WhereEverybodyKnowsYourName

TROUBLESHOOTING
SA06G±02
Use the table below to help you find the cause of the problem.
The numbers indicate the priority of the likely cause of the problem. Ch\
eck each part in order.
If necessary, replace these parts.
SA±3
SA±5
SA±27
SA±107
SA±45
SA±124
SA±35
,40
SA±113
,11
7
SA±16
SA±51
SA±25
SA±105 SA±3
SA±3 SA±27
SA±107
SA±2±
SUSPENSION AND AXLE TROUBLESHOOTING
WhereEverybodyKnowsYourName

GENERAL INSPECTION
SA19Y±01
1. INSPECT TIRE
(a) Check the tires for wear and for the proper inflation pressure.Cold tire inflation pressure (SC400):
 

Tire size 


Front
kPa (kg/cm2, psi)
 


Rear
kPa (kg/cm2, psi)
 P225/55R16 93V 220 (2.2, 32) 220 (2.2, 32)
Cold tire inflation pressure (SC300):
 

Tire size 

Front
kPa (kg/cm2, psi) 

Rear
kPa (kg/cm2, psi) 

P215/60R15 94V
 

210 (2.1, 30)
 

210 (2.1, 30)
 P215/60R15 93V  
(b) Check the tire runout.
Tire runout:
 SC400 Less then 1.4 mm (0.055 in.)
 SC300 Less then 1.0 mm (0.039 in.)
2. ROTATING TIRESNOTICE: The wheel assemblies must be rotated only be-
tween the front and rear.
3. INSPECT WHEEL BALANCE
(a) Check and adjust the Off±the±car balance.
(b) If necessary, check and adjust the On±the±car balance.
Unbalance after adjustment: 8.0 g (0.018 lb) or less
±
SUSPENSION AND AXLE GENERAL INSPECTIONSA±3
WhereEverybodyKnowsYourName

4. CHECK WHEEL BEARING LOOSENESS
(a) Check the backlash in bearing shaft direction.
Maximum: 0.05 mm (0.0020 in.)
(b) Check the axle hub deviation.
Maximum: 0.05 mm (0.0020 in.)
5. CHECK FRONT SUSPENSION FOR LOOSENESS
6. CHECK STEERING LINKAGE FOR LOOSENESS
7. CHECK BALL JOINT FOR EXCESSIVE LOOSENESS
8. CHECK SHOCK ABSORBER WORK PROPERLYwCheck for oil leak
w Check mounting busings for wear
w Bounce front and rear of the vehicle
SA±4
±
SUSPENSION AND AXLE GENERAL INSPECTION
WhereEverybodyKnowsYourName

WHEEL ALIGNMENT
FRONT WHEEL ALIGNMENT
SA19Z±01
1. MEASURE VEHICLE HEIGHTFront vehicle height (SC400):
 Tire size Front P225/55R16194.4 mm (7.654 in.)
Front vehicle height (SC300):
 Tire size Front P215/60R15190.4 mm (7.496 in.)
Measuring point:
Measure from the ground to the center of the lower suspen-
sion arm front mounting bolt.
NOTICE: Before inspecting the wheel alignment, adjust
the vehicle height to specification.
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, CASTER AND STEERING AXIS INCLINATION
Specifications:
 

Camber
Left±right error 

0
01 ' + 45 '
30 ' or less
 

Caster
Left±right error256 ' + 45 '
30 ' or less
 


Steering axis inclination
Left±right error 


8
58 ' + 45 '
30 ' or less
If the steering axis inclination is not as specified, after camber
and caster have correctly adjusted, recheck the steering
knuckle front wheel for bearing or looseness.
4. INSPECT TOE±IN
Toe±in (total): A + B 0.1  + 0.2 
C±D 1 + 2 mm (0.04 + 0.08 in.)
If toe±in is not within specification adjust by the tie rod end.
±
SUSPENSION AND AXLE WHEEL ALIGNMENTSA±5
WhereEverybodyKnowsYourName

5. ADJUST CAMBER AND CASTERSpecifications:
 


Camber
Left±right error 


0
01 ' + 30 '
30 ' or less
 


Caster
Left±right error 


2
56 ' + 30 '
30 ' or less
(a) Remove the engine under cover.
(b) Loosen the front and/or rear adjusting cam nuts.
(c) Adjust the camber and caster by front and/or rear adjusting
cams.
(See adjustment chart )
(d) Torque the front and/or rear adjusting cam nuts.
Torque: 226 N Vm (2,300 kgf Vcm, 166 ft Vlbf)
6. ADJUST TOE±IN
(a) Remove the boot clamps.
(b) Loosen the tie rod end lock nuts.
(c) Turn the left and right tie rod ends an amount to adjust the
toe±in.
Toe±in (total):
A+B 0.1  + 0.1 
C±D 1 + 1 mm (0.04 + 0.04 in.)
HINT: Insure that the lengths of the left and right tie rods are
the same.
Tie rod end length left±right error:
Less than 1.5 mm (0.059 in.)
SA±6±
SUSPENSION AND AXLE WHEEL ALIGNMENT
WhereEverybodyKnowsYourName

(d) Tighten the tie rod end lock nut.
Torque: 56 NVm (570 kgf Vcm, 41 ft Vlbf)
(e) Place the boot on the seat and clip it.
HINT: Insure that the boots are not twisted.
7. INSPECT WHEEL ANGLE Wheel angle:
 

Inside wheel
 

37
04 '
(35 04 ' ~ 38 04 ')
 

Outside wheel
(reference) 

32
23 '
If wheel angle differ from the standard specifications, check
to see if the lengths of the left and right tie rods are the same.
HINT: If the tie rods lengths are not equal, the wheel angle
can not be adjusted properly.
Reinspect the toe±in after adjusting the tie rods lengths.
±
SUSPENSION AND AXLE WHEEL ALIGNMENTSA±7
WhereEverybodyKnowsYourName