torque LEXUS SC400 1991 Service Repair Manual

SERVICE SPECIFICATIONS
SERVICE DATA
RS02S±01
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FRONT AIRBAG SENSOR\
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S ±
A\
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755±855

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S ± S\
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1 M
or Higher
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 S ± A\
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Less than 1

TORQUE SPECIFICATIONS
RS02T±07
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Part tightened NVm kgf Vcm ft Vlbf
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Steering wheel 35 360 26
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Steering wheel pad 7.4 75 65 in. Vlbf
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Front passenger airbag assembly 21 210 15
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Front airbag sensor 25 260 19
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Center airbag sensor assembly 15 150 11
RS±126±
SUPPLEMENTAL RESTRAINT SYSTEM SERVICE SPECIFICATIONS
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PREPARATION
SST (SPECIAL SERVICE TOOLS)
RS00X±04
RECOMMENDED TOOLS
RSOOY±04
EQUIPMENT
RS00Z±04\
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Torque wrench 
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Bolt Length: 35 mm (1.38 in.) Pitch: 1.0 mm (0.039 in.)
Diam.: 6.0 mm (0.236 in.) 

Airbag disposal
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Tire Width: 185 mm (7.28 in.) Inner diam.: 360mm (14.17 in.) Airbag disposal
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Tire with disk wheel Width: 185 mm (7028 in.)
Inner diam.: 360 mm (14.17 in.) 


Airbag disposal
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 \
Vinyl bag Airbag disposal
±
SUPPLEMENTAL RESTRAINT SYSTEM PREPARATIONRS±15
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6. INSTALL STEERING WHEEL
(a) Align matchmarks on the steering wheel and main shaft, andinstall the steering wheel to the main shaft.
(b) Install and torque the set nut.
Torque: 35 N Vm (360 kgf Vcm, 26 ft Vlbf)
(c) Connect the connector.
7. INSTALL STEERING WHEEL PAD
(a) Connect the SRS connector.
(b) Install the wheel pad after confirming that the circumference
groove of the torx screws is caught on the screw case.
(c) Using a torx wrench, tighten the 4 screws.
Torque: 7.4 N Vm (75 kgf Vcm, 65 in. Vlbf)
NOTICE:
w Make sure the wheel pad is installed to the specified
torque.
w If the wheel pad has been dropped, or there are cracks,
dents or other defects in the case or connector, replace
the wheel pad with a new one.
w When installing the wheel pad, take care that the wirings
do not interfere with other parts and are not pinched
between other parts.
8. CHECK STEERING WHEEL CENTER POINT
9. CONNECT NEGATIVE (±) TERMINAL CABLE TO
BATTERY
RS±20
±
SUPPLEMENTAL RESTRAINT SYSTEM STEERING WHEEL PAD AND SPIRAL CABLE
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5. REMOVE GLOVE COMPARTMENT DOOR LOCKMOUNTING BRACKET
Remove the 2 screws, disconnect the door lock mounting
bracket.
(a) Remove the 3 screws, 2 nuts and bolt.
6. REMOVE FRONT PASSENGER AIRBAG ASSEMBLY
(b) Pull out the front pass enger airbag assembly from the
instrument panel.
NOTICE: When removing the front passenger airbag as-
sembly, take care not to pull the airbag wire harness.
CAUTION:
w When storing the front passenger airbag assembly, keep
the upper surface of the front passenger airbag assembly
facing upward.
w Never disassemble the front passenger airbag assembly.
7. INSTALL FRONT PASSENGER AIRBAG ASSEMBLY
(a) Install and torque the 2 nuts and the bolt.
Torque: 21 N Vm (210 kgf Vcm, 15 ft Vlbf)
(b) Install the 3 screws.
NOTICE:
w Make sure the front passenger airbag assembly is
installed to the specified torque.
w If the front passenger airbag assembly has been
dropped, or there are cracks, dents or other defects in the
case or connector, replace the front passenger airbag
assembly with a new one.
w When installing the front passenger airbag assembly,
take care that the wiring do not interfere with other parts
and are not pinched between other parts.
RS±32±
SUPPLEMENTAL RESTRAINT SYSTEM FRONT PASSENGER AIRBAG ASSEMBLY
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1. DISCONNECT NEGATIVE (±) TERMINAL CABLE FROMBATTERY
CAUTION: Work must be started after 90 seconds from
the time the ignition switch is turned to the ªLOCKº posi-
tion and the negative (±) terminal cable is disconnected
from the battery.
(See page RS±2)
2. REMOVE ENGINE UNDER COVER
(See page BO±12)
3. REMOVE FRONT AIRBAG SENSOR
(a) Disconnect the connector.
(b) Remove the bolt, the nut and the sensor.
4. INSTALL FRONT AIRBAG SENSOR
(a) Install the sensor with the arrow on the sensor facing toward the front of the vehicle.
Torque: 25 N Vm (260 kgf Vcm, 19 ft Vlbf)
NOTICE:
w Make sure the sensor is installed to the specified torque.
w If the sensor has been dropped, or there are cracks, dents
or other defects in the case, brackets or c onnector,
replace the sensor is removed, always replace the set bolt
and the nut with new one.
w The sensor set bolt and the nut have been anti±rust
treated. When the sensor is removed, always replace the
set bolt and the nut with new ones.
w After installation, shake the sensor to check that there is
no looseness.
w The front sensor is equipped with an electrical
connection check mechanism. Be sure to lock this
mechanism securely when connecting the connector. If
the connector is not securely locked, a malfunction code
will be detected by the diagnosis system.
w Check that the dimensions of the body where the front
airbag sensor is installed match those in the body
dimension drawings in the BODY section.
(The SRS may malfunction, or may not work, if the
dimensions of the sensor mount is not correct.)
5. INSTALL ENGINE UNDER COVER
6. CONNECT NEGATIVE (±) TERMINAL CABLE TO BATTERY
±
SUPPLEMENTAL RESTRAINT SYSTEM FRONT AIRBAG SENSORRS±43
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CENTER AIRBAG SENSOR ASSEMBLY
REMOVAL AND INSTALLATION
RS049±01
NOTICE:
wDo not open the cover or the case of the ECU and various
computers unless absolutely necessary. (If the IC
terminals are touched, the IC may be destroyed by static
electricity.)
w Never use SRS parts from another vehicle. When
replacing parts, replace with new parts.
w Never reuse the center airbag sensor assembly involved
in a collision when the airbag has deployed.
w Never repair a sensor in order to reuse it.
1. DISCONNECT NEGATIVE (±) TERMINAL CABLE FROM
BATTERY
CAUTION: Work must be started after 90 seconds from
the time the ignition switch is turned to the LOCK posi-
tion and the negative (±) terminal cable is disconnected
from the battery (See page RS±2).
2. REMOVE AND INSTALL CENTER AIRBAG SENSOR ASSEMBLY
(a) Using a torx wrench, loosen and tighten the 3 screws.
Torx wrench: T40 (Part No. 09042±00020 or locally manufac-
tured tool)
(b) Disconnect and connect the connector. NOTICE: Removal and installation of the connector is
done with the sensor assembly installed.
(c) Using a torx wrench, tighten the 3 screws. Torx wrench: T40 (Part No. 09042±00020 or locally manufac-
tured tool)
Torque: 15 N Vm (150 kgf Vcm, 11 ft Vlbf)
NOTICE:
w Make sure the sensor assembly is installed to the
specified torque.
w If the sensor assembly has been dropped, or there are
cracks, dents or other defects in the case, bracket or
connector, replace the sensor assembly with a new one.
w When installing the sensor assembly, take care that the
airbag wiring does not interfere with other parts and is
not pinched between other parts.
w After installation, shake the sensor assembly to check
that there is no looseness.
RS±46±
SUPPLEMENTAL RESTRAINT SYSTEM CENTER AIRBAG SENSOR ASSEMBLY
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(e) Remove the upper mount stopper from the differential carrier.
HINT:
w Same vehicles have the adjusting shim for adjusting the
propeller shaft joint angle installed on top of the upper
mount stopper.
w Adjusting shim is not always as it is used upon need.
DIFFERENTIAL INSTALLATION
SA0S7±06
1. INSTALL DIFFERENTIAL
(a) Install the upper mount stopper on the differential carrier.
HINT:
wUse the upper mount stopper which was removed.
w On vehicles with the adjusting shim installed on top of
the mount upper stopper, install that adjusting shim.
w Adjusting shim is not always as it is used upon need.
(b) Support the differential with a jack and install the lower stoppers and 2 new bolts.
Torque: 147 N Vm (1,500 kgf Vcm, 108 ft Vlbf)
(c) Using a hexagon wrench, install 2 new LH mounting bolts.
Torque: 142 N Vm (1,450 kgf Vcm, 105 ft Vlbf)
(d) Using a hexagon wrench, install a new RH mounting bolt.
Torque: 142 N Vm (1,450 kgf Vcm, 105 ft Vlbf)
±
SUSPENSION AND AXLE REAR DIFFERENTIALSA±83
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2. CONNECT REAR DRIVE SHAFTS
(a) Align the matchmarks on the side gear shaft and drive shafts.
(b) Apply a light coat of engine oil on the threads of the bolts.
(c) Temporarily install the 12 hexagon bolts and 4 washers.
(d) Using a hexagon wrench, torque the bolts.
Torque: 83 N Vm (850 kgf Vcm, 61 ft Vlbf)
3. INSTALL PROPELLER SHAFT
(See page PR±12 or 28)
4. FILL DIFFERENTIAL WITH OIL
Oil grade: API GL±5 Hypoid Gear Oil
Viscosity: Above±18
C (0
F) SAE 90
Below±18
C (0
F) SAE 80W±90 or 80W
Capacity:
1.35 liters (1.42 US qts, 1.19 lmp qts)
SA±84±
SUSPENSION AND AXLE REAR DIFFERENTIAL
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If the backlash is not within the specification, adjust the back-
lash. (See page SA±98)
5. MEASURE DRIVE PINION PRELOAD Using SST and a torque wrench, measure the drive pinion
preload using the backlash of the drive pinion and ring gear.
Preload (at start):
0.5±0.8 N Vm (5±8 kgf Vcm, 4.3±6.9 in. Vlbf)
HINT: With vehicles which have run less than 8,000 km
(5,000 miles), the preload may be large.
SST 09229±55010
Maximum preload (at start):
1.8 N Vm (18 kgf Vcm, 16.0 in. Vlbf)
6. CHECK TOTAL PRELOAD
Using SST and a torque wrench, measure the total preload.
SST 09229±55010
Total preload (at start):
In addition to drive pinion preload
0.5±0.8 N Vm (5±8 kgf Vcm, 4.3±6.9 in. Vlbf)
If necessary, disassemble and inspect the differential.
7. CHECK PINION GEAR BACKLASH Measure the pinion gear backlash while holding one side
gear toward the case.
Backlash:
0.05±0.02 mm (0.0020±0.0079 in.)
If the backlash is not within the specification, install the cor-
rect thrust washer. (See page SA±93)
8. CHECK TOOTH CONTACT PATTERN (See page SA±99)
DIFFERENTIAL CARRIER DISASSEMBLY
SA0V4±02
HINT: When fastening the differential carrier to an overhaul
stand, etc., fasten it at the 4 places on the ring gear side
shown in the illustration.
±
SUSPENSION AND AXLE REAR DIFFERENTIALSA±87
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(b) Stake the differential case.
3. INSTALL RING GEAR ON DIFFERENTIAL CASE
(a) Clean the contact surfaces of the differential case and thethreads of the ring gear and differential case.
(b) Heat the ring gear in boiling water.
(c) A f t e r t h e m o i s t u r e o n t h e r i n g g e a r h a s c o m p l e t e l y evaporated, quickly install the ring gear to the differential
case.
HINT: Align the matchmarks on the ring gear and the dif feren-
tial case.
(d) Tighten 2 of the bolts temporarily so that the bolt holes in the ring gear and differential case are not misaligned.
NOTICE: The ring gear set bolts should not be tightened until
the ring gear has cooled sufficiently.
4. INSTALL RING GEAR SET BOLTS
(a) After the ring gear has cooled sufficiently, install 10 new ringgear set bolts to which thread lock has been applied.
Thread lock:
Part No. 08833±00100, THREE BOND 1360 K or
equivalent.
NOTICE: New ring gear set bolts should be used in every case.
(b) Torque the 10 set bolts uniformly and a little at a time.
Torque: 64 N Vm (650 kgf Vcm, 47 ft Vlbf)
(c) Tighten the bolts an additional 60±90
.
NOTICE: Tighten the bolts in diagonally opposite pairs.
SA±94±
SUSPENSION AND AXLE REAR DIFFERENTIAL
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