1991 LEXUS SC400 cooling

14. INSTALL IGNITION COIL(a) Install the ignition coil with the two bolts.
(b) Connect the following connectors and cord:(1) Ignition coil connector
(2) Noise filter connector
(3) High±tension cord
15. INSTALL A/C COMPRESSOR (a) In sta ll th e A/C co mp re sso r, co mp re sso r sta y an dground cable with the three bolts and nut.
Torque: Bolt 49 N Vm (500 kgf Vcm, 36 ft Vlbf)
Nut 29 N Vm (300 kgf Vcm, 22 ft Vlbf)
(b) Connect the A/C compressor connector.
16. INSTALL DRIVE BELT Install the drive belt by turning the drive belt tensioner coun-
terclockwise.
HINT: The pulley bolt for the belt tensioner has a left±hand
thread.
17. CONNECT RADIATOR HOSE TO WATER INLET
±
COOLIING SYSTEM Electronically Controlled Hydraulic Cooling Fan
(Hydraulic Pump)CO±45
WhereEverybodyKnowsYourName

18. INSTALL BATTERY
19. FILL ENGINE WITH COOLANT (See page CO±7)
20. FILL COOLING FAN RESERVOIR TANK WITH FLUID (See pages CO±23 and 24)
21. START ENGINE AND CHECK FOR LEAKS
22. INSTALL ENGINE UNDER COVER
CO±46
±
COOLIING SYSTEM Electronically Controlled Hydraulic Cooling Fan
(Hydraulic Pump)
WhereEverybodyKnowsYourName

Hydraulic Motor
COMPONENTS FOR REMOVAL AND
INSTALLATION
±
COOLIING SYSTEM Electronically Controlled Hydraulic Cooling Fan
(Hydraulic Motor)CO±47
WhereEverybodyKnowsYourName

REMOVAL OF HYDRAULIC MOTOR
(See Components on page CO±47)
1. REMOVE BATTERY CAUTION: Work must be started after approx. 20 se-
conds or longer from the time the ignition switch is
turned to the ºLOCKº position and the negative (±) termi-
nal cable is disconnected from the battery.
2. REMOVE ENGINE UNDER COVERS
3. DRAIN ENGINE COOLANT (See page CO±6)
4. REMOVE RADIATOR RESERVOIR TANK (a) Disconnect the coolant level sensor connector.
(b) Disconnect the following hoses:(1) Reservoir hose from water inlet housing
(2) Reservoir hose from radiator
(c) Remove the two bolts and reservoir tank bracket.
(d) Disconnect the reservoir tank from the reservoir tank bracket, and remove the reservoir tank.
5. DISCONNECT HOSES Disconnect the following hoses:(1) Upper radiator hose from radiator
(2) Pressure hose from hydraulic motor
(3) Return hose from hydraulic motor
CO±48
±
COOLIING SYSTEM Electronically Controlled Hydraulic Cooling Fan
(Hydraulic Motor)
WhereEverybodyKnowsYourName

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.
±
COOLIING SYSTEM Electronically Controlled Hydraulic Cooling Fan
(Hydraulic Motor)CO±49
WhereEverybodyKnowsYourName

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)
WhereEverybodyKnowsYourName

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.
±
COOLIING SYSTEM Electronically Controlled Hydraulic Cooling Fan
(Hydraulic Motor)CO±51
WhereEverybodyKnowsYourName

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.
CO±52±
COOLIING SYSTEM Electronically Controlled Hydraulic Cooling Fan
(Hydraulic Motor)
WhereEverybodyKnowsYourName