Lexus SC300 / Lexus SC400. Manual - part 709

6.  DISCONNECT COOLING FAN INLET PIPE FROM FAN

SHROULD
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 fan

shrould.

(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

9. 

REMOVE COOLING FAN FROM HYDRAULIC MOTOR
Loosen 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)

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 housing

with the dot mark facing upward.

(b)  Using a feeler gauge 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

HINT: When replacing the rotors, select the rotor set accord-
ing to the imprinted mark on the motor housing.

ÑÑÑÑÑÑÑÑÑÑ

ÑÑÑÑÑÑÑÑÑÑ

Imprinted mark on housing

ÑÑÑÑÑÑÑÑÑÑÑÑÑ

ÑÑÑÑÑÑÑÑÑÑÑÑÑ

Rotor set

ÑÑÑÑÑÑÑÑÑÑ

1

ÑÑÑÑÑÑÑÑÑÑÑÑÑ

16906–50010

ÑÑÑÑÑÑÑÑÑÑ

ÑÑÑÑÑÑÑÑÑÑ

2

ÑÑÑÑÑÑÑÑÑÑÑÑÑ

ÑÑÑÑÑÑÑÑÑÑÑÑÑ

16906–50020

ÑÑÑÑÑÑÑÑÑÑ

ÑÑÑÑÑÑÑÑÑÑ

3

ÑÑÑÑÑÑÑÑÑÑÑÑÑ

ÑÑÑÑÑÑÑÑÑÑÑÑÑ

16906–50030

2. 

INSPECT OIL CLEARANCE OF DRIVE SHAFT
(a)  Using a caliper gauge, measure the shaft hole inside

diameter 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)