Lexus SC300 / Lexus SC400. Manual — part 706

REPLACEMENT OF OIL SEAL

1.

REMOVE OIL SEAL
Using SST and a hammer, tap out the oil seal.
SST 09631–10030

2.

INSTALL OIL SEAL
(a) Using a 22 mm socket wrench and hammer, tap in a new

oil seal until its surface is flush with the housing edge.

(b) Apply fluid to the oil seal lip.

ASSEMBLY OF HYDRAULIC PUMP

(See Components on page

CO–31

)

HINT:

•

Thoroughly clean all parts to be assembled.

•

Before installing the parts, apply new fluid to all sliding
and rotating surfaces.

1.

MOUNT REAR HOUSING
HINT: Mount the parts in a vise as shown in the illustration.

2.

INSTALL SPOOL VALVE
(a) Align the small hole of the spool sleeve with the hole of

the rear housing, and insert the spool body into the rear
housing.

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COOLIING SYSTEM

Electronically Controlled Hydraulic
Cooling Fan (Hydraulic Pump)

CO–37

(b) Insert the compression spring and spool valve into the

rear housing.

(c) Install a new O–ring to the end plug.
(d) Apply fluid to the O–ring.
(e) Temporarily install the end plug.

(f)

Insert a 5 mm (0.19 in.) straight pin through the holes of
the rear housing and spool sleeve.

(g) Using a 10 mm hexagon wrench, install the end plug.

Torque: 19 N

⋅

m (200 kgf

⋅

cm, 14 ft

⋅

lbf)

(h) Pull out the straight pin.

CO–38

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COOLIING SYSTEM

Electronically Controlled Hydraulic
Cooling Fan (Hydraulic Pump)

3.

REMOUNT REAR HOUSING
HINT: Mount the parts in a vise as shown in the illustration.

4. INSTALL

CASING

HINT: If rubber from the O–rings adheres to the O–ring instal-
lation location, replace the casing.
(a) Install a new O–ring to the rear housing groove.

(b) Align the pin hole of the casing with the straight pin on

the rear housing, and install the casing.

5.

INSTALL REAR THRUST WASHER

6.

INSTALL DRIVEN AND DRIVE ROTORS
Install the drive and driven rotors with the dot mark facing up-
ward.

7.

INSTALL DRIVE SHAFT

8.

INSTALL FRONT THRUST WASHER

–

COOLIING SYSTEM

Electronically Controlled Hydraulic
Cooling Fan (Hydraulic Pump)

CO–39

9.

INSTALL FRONT HOUSING
(a) Install a new O–ring to the casing groove.

(b) Align the pin holes of the front housing with the straight

pin.

(c) Apply a light coat of fluid on the threads and under the

heads of the mounting bolts.

(d) Install the front housing with the five bolts.

Torque: 21 N

⋅

m (210 kgf

⋅

cm, 15 ft

⋅

lbf)

10. INSTALL DRIVE SHAFT PRELOAD

(a) Check that the drive shaft rotates smoothly without

abnormal noise.

(b) Temporarily install the pulley nut, and check the rotating

torque.

Rotating torque:

0.3 N

⋅

m (3.0 kgf

⋅

cm, 2.6 in.

⋅

lbf)

11. INSTALL

PUMP

PULLEY

(a) Slide the pulley onto the drive shaft.
(b) Measure the clearance between the pulley end and

drive shaft end.

Standard: 1.3–1.7 mm (0.051–0.067 in.)

Minimum: 1.0 mm (0.039 in.)

If the clearance is less than minimum, replace the pulley.

CO–40

–

COOLIING SYSTEM

Electronically Controlled Hydraulic
Cooling Fan (Hydraulic Pump)