1991 LEXUS SC400 cooling

6. DISCONNECT COOLING FAN INLET PIPE FROM FANSHROULD
Remove the two bolts, brackets and bushings, and discon-
nect the inlet pipe.
7. DISCONNECT COOLING FAN RESERVOIR TANK FROM FAN SHROULD
(a) Disconnect the suction hose from the clamp on the fanshrould.
(b) Remove the four bolts, and disconnect the reservoir tank.
8. REMOVE RADIATOR FAN SHROULD (a) Disconnect the wire clamp (for temperature sensor)from the radiator fan shrould.
(b) Remove the four bolts, and disconnect the fan shrould from the radiator.
(c) Slightly lift the fan shrould, and disconnect the two oil cooler hoses (for cooling fan) from the hose clamp on
the fan shrould.
(d) Remove the fan shrould.
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COOLIING SYSTEM Electronically Controlled Hydraulic Cooling Fan
(Hydraulic Motor)CO±49
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9. REMOVE COOLING FAN FROM HYDRAULIC MOTORLoosen the pulley nut clockwise, and remove the nut, plate
washer and fan.
10. REMOVE HYDRAULIC MOTOR FROM FAN SHROULD Remove the three bolts and hydraulic motor.
COMPONENTS FOR DISASSEMBLY AND
ASSEMBLY
CO±50±
COOLIING SYSTEM Electronically Controlled Hydraulic Cooling Fan
(Hydraulic Motor)
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DISASSEMBLY OF HYDRAULIC MOTOR
(See Components on page CO±50)
1. MOUNT MOTOR HOUSING Slightly mount the motor housing in a vise.
NOTICE: Be careful not to damage the motor housing.
2. REMOVE MOTOR COVER (a) Remove the four bolts and motor cover.
(b) Remove the O±ring from the motor housing.
3. REMOVE REAR THRUST WASHER AND DRIVE SHAFT
4. REMOVE DRIVE AND DRIVEN ROTORS
5. REMOVE FRONT THRUST WASHER
INSPECTION OF HYDRAULIC MOTOR
1. INSPECT DRIVE AND DRIVEN ROTORS (a) Install the drive and driven rotor to the motor housingwith the dot mark facing upward.
(b) Using a feeler g auge and precision straight edge,
measure the side clearance between the rotor and
precision straight edge.
Standard side clearance: 0.01±0.04 mm
(0.0004±0.0016 in.)
Maximum side clearance: 0.05 mm (0.0020 in.)
If the clearance is greater than maximum, replace the rotors
as a set. If necessary, replace the motor assembly.
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COOLIING SYSTEM Electronically Controlled Hydraulic Cooling Fan
(Hydraulic Motor)CO±51
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HINT: When replacing the rotors, select the rotor set accord-
ing to the imprinted mark on the motor housing.
 Imprinted mark on housing Rotor set
116906±50010 2 16906±50020 3 16906±50030
2. INSPECT OIL CLEARANCE OF DRIVE SHAFT(a) Using a caliper gauge, measure the shaft hole insidediameter of the housing and cover.
Shaft hole inside diameter: 14.000±14.011 mm
(0.5512±0.5516 in.)
(b) Using a micrometer, measure the drive shaft diameter.
Shaft diameter: 13.973±13.984 mm
(0.5501±0.5506 in.)
(c) Subtract the drive shaft diameter measurement from the
shaft hole diameter measurement.
Standard clearance: 0.016±0.038 mm
(0.0006±0.0015 in.)
Maximum clearance: 0.04 mm (0.0016 in.)
If the clearance is greater than maximum, replace the shaft.
If necessary, replace the motor assembly.
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COOLIING SYSTEM Electronically Controlled Hydraulic Cooling Fan
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REPLACEMENT OF OIL SEAL
1. REMOVE OIL SEAL(a) Using snap ring pliers, remove the snap ring and platewasher.
(b) Using a screwdriver, pry out the oil seal.
NOTICE: Be careful not to damage the housing.
2. INSTALL OIL SEAL (a) Using SST and a hammer, tap in a new oil seal to a depth
of 4.5±5.5 mm (0.177±0.217 in.) from the housing edge.
(b) Using snap ring pliers, install the plate washer and snap ring.
(c) Apply fluid to the oil seal lip.
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COOLIING SYSTEM Electronically Controlled Hydraulic Cooling Fan
(Hydraulic Motor)CO±53
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ASSEMBLY OF HYDRAULIC MOTOR
(See Components on page CO±50)
HINT:
w Thoroughly clean all parts to be assembled.
w Before installing the parts, apply new fluid to all sliding
and rotating surfaces.
1. MOUNT MOTOR HOUSING Slightly mount the motor housing in a vise.
NOTICE: Be careful not to damage the motor housing.
2. INSTALL FRONT THRUST WASHER
3. INSTALL DRIVEN AND DRIVE ROTORS Install the d rive and driven rotors with the dot mark facing up-
ward.
4. INSTALL DRIVE SHAFT
5. INSTALL REAR THRUST WASHER
6. INSTALL MOTOR COVER (a) Install a new O±ring to the motor housing groove.
(b) Install the motor cover with the four bolts.
Torque: 28 N Vm (290 kgf Vcm, 21 ft Vlbf)
CO±54±
COOLIING SYSTEM Electronically Controlled Hydraulic Cooling Fan
(Hydraulic Motor)
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7. INSTALL DRIVE SHAFT PRELOAD(a) Check that the drive shaft rotates smoothly withoutabnormal noise.
(b) Temporarily install the pulley nut, and check the rotating
torque.
Rotating torque:
0.3 N Vm (3.0 kgf Vcm, 2.6 in. Vlbf)
INSTALLATION OF HYDRAULIC MOTOR
(See Components on page CO±47)
1. INSTALL HYDRAULIC MOTOR TO FAN SHROULD Install the hydraulic motor with the three bolts.
Torque: 4.9 N Vm (50 kgf Vcm, 43 in. Vlbf)
2. INSTALL COOLING FAN TO HYDRAULIC MOTOR
Install the fan with the plate washer bolt.
Tighten the nut by turning it counterclockwise.
Torque: 15 N Vm (150 kgf Vcm, 11 ft Vlbf)
3. INSTALL RADIATOR FAN SHROULD
(a) Place the fan shrould on the radiator.
(b) Slightly lift the fan shrould, and connect the two oil cooler
hoses (for cooling fan) to the hose clamp on the fan
shrould.
(c) Install the fan shrould with the four bolts.
Torque: 4.9 N Vm (50 kgf Vcm, 43 in. Vlbf)
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COOLIING SYSTEM Electronically Controlled Hydraulic Cooling Fan
(Hydraulic Motor)CO±55
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(d) Install the wire clamp to the fan shrould.
4. INSTALL COOLING FAN RESERVOIR TANK TO FAN SHROULD
(a) Install the reservoir tank with the four bolts.
Torque: 4.9 N Vm (50 kgf Vcm, 43 in. Vlbf)
(b) Install the suction hose to the clamp on the fan shrould.
5. INSTALL COOLING FAN INLET PIPE TO FAN SHROULD Install the inlet pipe with the two bushings, brackets and
bolts.
Torque: 4.9 N Vm (50 kgf Vcm, 43 in. Vlbf)
6. CONNECT HOSES
Connect the following hoses:(1) Pressure hose to hydraulic motor C onnect the
pressure hose with a new gasket and union bolt.
Torque: 64 N Vm (650 kgf Vcm, 47 ft Vlbf)
(2) Return hose to hydraulic motor.
(3) Upper radiator hose to radiator.
CO±56
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COOLIING SYSTEM Electronically Controlled Hydraulic Cooling Fan
(Hydraulic Motor)
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