1991 LEXUS SC400 Service Repair Manual

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Page 2849 of 4087

LEXUS SC400 1991 Service Repair Manual
5. INSPECT WATER TEMPERATURE SENSORUsing an ohmmeter, measure the resistance between the ter-
minals.
Resistance: 1.48±1.58 k at 80 5C (176 5F)
If the resistance is not as specified, replace the

Page 2850 of 4087

LEXUS SC400 1991 Service Repair Manual
SERVICE SPECIFICATIONS
SERVICE DATA
ThermostatValve opening temperature80±845C176±183 5F
Valve liftat 95 5C (203 5F) 10 mm0.39 in.
Radiator capRelief valve opening pressureSTD74±103 kPa
(0.75±1.0

Page 2851 of 4087

LEXUS SC400 1991 Service Repair Manual
TORQUE SPECIFICATIONS
Part tightenedNVmkgf Vcmft Vlbf
Engine drain plug X Cylinder block1818013
Coolant filler plug X Water inlet housing44450 33
Water pump X Cylinder block18185 13
Water inlet housi

TORQUE SPECIFICATIONS
Part tightenedNVmkgf Vcmft Vlbf
Engine drain plug X Cylinder block1818013
Coolant filler plug X Water inlet housing44450 33
Water pump X Cylinder block18185 13
Water inlet housing X Water pump18185 13
Water inlet X Water inlet housing18185 13
Radiator fan shroud X Radiator4.950 43 in. Vlbf
Radiator X Body12120 9
Cooling fan reservoir tank X Radiator fan shroud4.950 43 in. Vlbf
Cooling fan inlet pipe X Radiator fan shroud4.950 43 in. Vlbf
Cooling fan pressure hose X Hydraulic motor64650 47
Radiator reservoir tank X Upper radiator support4.950 43 in. Vlbf
Radiator reservoir tank X Radiator reservoir tank support4.950 43 in. Vlbf
Hydraulic pump rear housing X End plug (for spool valve)19200 14
Hydraulic pump front housing X Rear housing21210 15
Hydraulic pump pulley X Drive shaft59600 43
Solenoid valve X Hydraulic pump rear housing39400 28
Hydraulic pump suction port union X Rear housing13135 10
Hydraulic pump X Cylinder block 12 mm head 16 160 12
14 mm head 20 310 22
\
\
Cooling fan pressure hose X Hydraulic pump 64 650 47
\
\
RH No.2 timing belt cover X Cylinder block 16 160 12
\
\
Drive belt idler pulley X Hydraulic pump 37 380 27
\
\
A/C compressor X Hydraulic pump 49 500 36
\
\
A/C compressor X Cylinder block 49 500 36\
\
A/C compressor stay X Oil filter bracket 29 300 22\
\
Hydraulic motor cover X Motor housing 28 290 21\

\

\
Hydraulic motor X Radiator fan shroud

4.9

50

43 in.
Vlbf
\
\
Cooling fan X Hydraulic motor 15 150 11
\
\
Cooling fan oil cooler X Body 18 180 13
\
\
Water temperature sensor X Radiator 7.4 75 65 in. Vlbf
±
COOLIING SYSTEM Service SpecificationsCO±65
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Page 2852 of 4087

LEXUS SC400 1991 Service Repair Manual
EMISSION CONTROL SYSTEM
NOTE: The specification descriptions ºUSA Spec.º and
º Exc. USA Spec. º used in this section indicate the following
specifications.
USA Spec .: USA (50 States) Specificati

Page 2853 of 4087

$LEXUS SC400 1991 Service Repair Manual DESCRIPTION The emission control systems are installed to reduce the amount of HC, CO, \ and NOx emitted from the en- gine, and to also prevent the release of evaporated fuel from the gasoline ta\ nk$

Page 2854 of 4087

LEXUS SC400 1991 Service Repair Manual
COMPONENTS LAYOUT (Contd)
±
EMISSION CONTROL SYSTEMS DescriptionEC±3
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Page 2855 of 4087

LEXUS SC400 1991 Service Repair Manual
SCHEMATIC DRAWING
EC±4±
EMISSION CONTROL SYSTEMS Description
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Page 2856 of 4087

LEXUS SC400 1991 Service Repair Manual
PREPARATION
SST (SPECIAL SERVICE TOOL)
RECOMMENDED TOOLS
EQUIPMENT
Part NameNote
Engine tune±up testerEngine speed
±
EMISSION CONTROL SYSTEMS PreparationEC±5
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