bolt LEXUS SC300 1991 Service Repair Manual

STANDARD BOLT TORQUE SPECIFICATIONS
HOW TO DETERMINE BOLT STRENGTH
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INTRODUCTION Standard Bolt Torque SpecificationsIN±35
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SPECIFIED TORQUE FOR STANDARD BOLTS
ClassDiameterPitchSpecified torqueClassmmmmHexagon head boltHexagon flange bolt
NVmkg Vcmft VlbN Vmkg Vcmft Vlb
6155548 in. Vlb66052 in. Vlb
81.2512.5130 9 14145 10
4T101.2526260 19 29290 21
121.2547480 35 53540 39
141.574760 55 84850 61
161.511 51,150 83 ±±±
616.56556 in. Vlb7.57565 in. Vlb
81.2515.5160 12 17.5175 13
5T101.2532330 24 36360 265T121.2559600 43 65670 48
141.591930 67 1001,050 76
161.51401,400 101 ±±±
6188069 in. Vlb99078 in. Vlb
81.2519195 14 21210 15
6T101.2539400 29 44440 326T121.2571730 53 80810 59
141.511 01,100 80 1251,250 90
161.51701,750 127 ±±±
6110.511 08121209
81.2525260 19 28290 21
7T101.2552530 38 58590 437T121.2595970 70 1051,050 76
141.51451,500 108 1651,700 123
161.52302,300 166 ±±±
81.2529300223333024
8T101.2561620 45 68690 50
121.2511 01,100 80 1201,250 90
81.2534340253738027
9T101.2570710 51 78790 57
121.251251,300 94 1401,450 105
81.2538390284243031
10T101.2578800 58 88890 64
121.251401,450 105 1551,600 116
81.2542430314748035
11 T101.2587890 64 97990 72
121.251551,60011 61751,800130
IN±36±
INTRODUCTION Standard Bolt Torque Specifications
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5. Non±reusable parts(a) Always replace cotter pins, gaskets, O±rings and oilseals etc. with new ones.
(b) Non±reusable parts are indicated in the component
illustrations by the º º symbol.
6. Precoated parts Precoated parts are bolts and nuts, etc. that are coated with
a seal lock adhesive at the factory.
(a) If a precoated part is retightened, loosened or causedto move in any way, it must be recoated with the
specified adhesive.
(b) Recoating of precoated parts
(1) Clean off the old adhesive from the bolt, nut or threads.
(2) Dry with compressed air.
(3) Apply the specified seal lock adhesive to the bolt or nut threads.
(c) P re co a te d pa rts are in d ica te d in th e co m ponent
illustrations by the º
º symbol.
7. When necessary, use a sealer on gaskets to prevent leaks.
8. Carefully observe all specifications for bolt tightening
torques. Always use a torque wrench.
9. Use of special service tools (SST) and special service materials (SSM) may be required, depending on the nature
of the repair. Be sure to use SST and SSM where specified
and follow the proper work procedure. A list of SST and SSM
can be found in the preparation part at the front of each
section in this manual.
10. When replacing fuses, be sure the new fuse has the correct
amperage rating. DO NOT exceed the rating or use one with
a lower rating.
11. Care must be taken when jacking up and supporting the vehicle. Be sure to lift and support the vehicle at the proper
locations (See page IN±33).
(a) If the vehicle is to be jacked up only at the front or rear end, be sure to block the wheels at the opposite end in
order to ensure safety.
(b) After the vehicle is jacked up, be sure to support it on
stands. It is extremely dangerous to do any work on a
vehicle raised on a jack alone, even for a small job that
can be finished quickly.
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INTRODUCTION General Repair InstructionsIN±5
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FRONT AIRBAG SENSOR
1. Never reuse the front airbag sensors involved in a collisionwhen the airbag has deployed. (Replace both the left and
right airbag sensors.)
2. Install the front airbag sensor with the arrow on the sensor facing toward the front of the vehicle.
3. The front airbag sensor set bolts have been anti±rust treated. When the sensor is removed, always replace the set bolts
with new ones.
4. The front airbag 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 (See page AB±10).
SPIRAL CABLE (IN COMBINATION
SWITCH)
The steering wheel must be fitted correctly to the steering column
with the spiral cable at the neutral position; otherwise cable dis-
connection and other troubles may result. Refer to page AB±15
of this manual concerning correct steering wheel installation.
STEERING WHEEL PAD (WITH AIRBAG)
1. When removing the steering wheel pad or handling a new steering wheel pad, it should be placed with the pad top
surface facing up.
In this case, the twin±lock type connector lock lever should
be in the locked state and care should be taken to place it so
the connector will not be damaged. And do not store a steer-
ing wheel pad on top of another one. (Storing the pad with its
metallic surface up may lead to a serious accident if the air-
bag inflates for some reason.)
2. Never measure the resistance of the airbag squib. (This
may cause the airbag to deploy, which is very
dangerous.)
IN±10±
INTRODUCTION Precautions for Vehicles Equipped with SRS Airbag
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SERVICE SPECIFICATIONS
SERVICE DATA
Idle speedMagnetic clutch no engagedApprox. 700 rpm
Magnetic clutch engaged Approx. 700 rpm
Magnetic clutch clearance0.5 + 0.15 mm0.020 + 0.006 in.
TORQUE SPECIFICATIONS
Part tightenedN Vmkgf Vcmft Vlbf
Suction hose X Compressor2525018
Discharge hose X Compressor25250 18
Compressor X EngineBolt 49500 36
Nut 29300 22
Liquid tube X Receiver10100 7
Liquid tube X Condenser10100 7
Discharge tube X Condenser10100 7
Expansion valve X Evaporator5.455 48 in. Vlbf
Suction tube X A/C Unit10100 7
Liquid tube X A/C Unit10100 7
Equalizer tube X EPR25250 18
Pressure switch X Liquid tube101007
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AIR CONDITIONING SYSTEM Service SpecificationsAC±141
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wTighten the O±ring fittings or the bolted type fittings to
the specified torque.
Precautions When Charging Refrigerant
1. DO NOT OPERATE COMPRESSOR WITHOUT ENOUGH
REFRIGERANT IN REFRIGERANT CYCLE
If there is not enough refrigerant in the refrigerant cycle, oil
lubrication will be insufficient and compressor burnout may
occur, so take care to avoid this.
2. DO NOT OPEN HIGH PRESSURE VALVE OF MANIFOLD GAUGE WITH COMPRESSOR OPERATING
If the high pressure valve is opened, refrigerant flows in the
reverse direction and could cause the charging cylinder to
rupture, so open and close the low pressure valve only.
3. BE CAREFUL NOT TO OVERCHARGE WITH REFRIGERANT IN SYSTEM
If refrigerant is overcharged, it causes trouble such as insuffi-
cient cooling, poor fuel economy, engine overheating etc.
Electrical Parts
Before removing and inspecting the electrical parts, set the
ignition switch to the LOCK position and disconnect the neg-
ative (±) terminal cable from the battery.
CAUTION: Work must not be started until after at least 20
seconds or longer from the time the negative (±) terminal
cable is disconnected.
SRS Airbag System
Failure to carry out service operations in the correct se-
quence could cause the airbag system to deploy, possibly
leading to a serious accident.
When removal or installation of the parts and the yellow wire
harness and connector for the airbag is necessary, refer to
the precautionary notices in the AB section before perform-
ing the operation.
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AIR CONDITIONING SYSTEM General DescriptionAC±5
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A/C UNIT
REMOVAL OF A/C UNIT
1. RECOVER REFRIGERANT IN SYSTEMSee page AC±16
2. REMOVE ENGINE See page EM±118
3. REMOVE WATER VALVE
See page AC±127
4. REMOVE BRAKE TUBES BRACKET MOUNTING BOLTS FROM DUSH PANEL
5. REMOVE EVAPORATOR See page AC±122
6. REMOVE WATER HOSE FROM HEATER RADIATOR
7. REMOVE INSULATOR RETAINER Remove the two bolts and the retainer.
8. REMOVE INSTRUMENT PANEL REINFORCEMENT See page BO±109
9. REMOVE FLOOR CARPET See page BO±118
10. REMOVE REAR AIR DUCTS Remove the nut and the air duct.
11. REMOVE HEATER TO RESISTER NO. 3 DUCT Remove the screw and the duct.
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AIR CONDITIONING SYSTEM A/C UnitAC±107
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12. REMOVE CONNECTOR BRACKET FROM UNDER SIDEOF BLOWER MOTOR
Remove the two screws and the bracket.
13. REMOVE A/C UNIT
(a) Disconnect connectors from the unit.
(b) Remove the six bolts and the A/C unit.
INSTALLATION OF A/C UNIT
1. INSTALL A/C UNIT
(a) Match the standard holes of the A/C unit with those on the vehicle.
HINT:
wV
Pull the drain hose of the A/C unit forward until the
yellow paint on the hose is visible in the engine
compartment.
w V
Insert the drain hose into the engine compartment hose
until the match marks are aligned.
(b) Tighten six bolts.
2. INSTALL CONNECTOR BRACKET
3. INSTALL HEATER TO RESISTER NO. 3 DUCT
4. INSTALL REAR AIR DUCTS
5. INSTALL FLOOR CARPET
6. INSTALL INSULATOR RETAINER
7. INSTALL WATER HOSE TO HEATER RADIATOR
8. INSTALL BRAKE TUBE BRACKET MOUNTING BOLTS
9. INSTALL WATER VALVE See page AC±127
AC±108
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AIR CONDITIONING SYSTEM Troubleshooting
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8. REMOVE COMPRESSOR(a) Remove under cover.
(b) Remove harness from the clamp.
(c) Remove the earth wire harness set bolt.
(d) R e m o v e t h e n u t , t h r e e b o l t s , b r a c k e t a n d t h ecompressor.
DISASSEMBLY OF MAGNETIC CLUTCH
AC±112±
AIR CONDITIONING SYSTEM Compressor
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1. REMOVE PRESSURE PLATE(a) Using a SST and socket wrench, remove the shaft bolt.SST 07112±76060
(b) Install a SST on the pressure plate. SST 07112±66040
(c) Using a SST and socket wrench, remove the pressure plate.
SST 07112±76060
(d) Remove the shims from the pressure plate.
2. REMOVE ROTOR (a) Using a SST, remove the snap ring.SST 07114±84020
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AIR CONDITIONING SYSTEM CompressorAC±113
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