Lexus SC300 / Lexus SC400. Manual - part 323

REMOVAL OF HYDRAULIC PUMP

(See Components on page 

CO–26

)

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 ”LOCK” position and the negative (–) termi-
nal cable is disconnected from the battery.

2. 

REMOVE ENGINE UNDER COVER

3. 

DRAIN ENGINE COOLANT (See page 

CO–6

)

4. 

REMOVE DRIVE BELT
Loosen the drive belt tension by turning the drive belt tension-
er counterclockwise, and remove the drive belt.
HINT: The pulley bolt for the belt tensioner has a left–hand
thread.

5. 

DISCONNECT A/C COMPRESSOR
(a)  Disconnect the A/C compressor connector.
(b)  Remove the nut, and disconnect the ground cable.
(c)  Remove the bolt and A/C compressor stay.

(d)  Remove the two bolts, and disconnect the A/C

compressor from the engine.

6. 

REMOVE LH IGNITION COIL
(a)  Disconnect the following connectors and cord:

(1) Ignition coil connector
(2) Noise filter connector
(3) High–tension cord

–

COOLIING SYSTEM

Electronically Controlled Hydraulic
Cooling Fan (Hydraulic Pump)

CO–27

(b)  Remove the two bolts and ignition coil.

7. 

REMOVE INTAKE AIR CONNECTOR
(a)  Disconnect the following hoses:

(1) Air hose from ISC valve
(2) Air hose (from PS air control valve) from intake air

connector

(b)  Remove the bolt holding the intake air connector to the

cylinder head cover.

(c)  Loosen the two hose clamps.
(d)  Disconnect the intake air connector from the throttle

body and air cleaner hose, and remove the throttle body.

8. 

REMOVE UPPER HIGH–TENSION CORD COVER
(a)  Remove the two mounting bolts.
(b)  Disconnect the front side claw groove of the cord cover

from the claw of the lower cover, and remove the cord
cover.

9. 

REMOVE RH ENGINE WIRE COVER
Remove the bolt and engine wire cover.

CO–28

–

COOLIING SYSTEM

Electronically Controlled Hydraulic
Cooling Fan (Hydraulic Pump)

10.  REMOVE LH ENGINE WIRE COVER

Remove the two bolts and engine wire cover.

11.  REMOVE VSV FOR EVAP SYSTEM

Remove the two bolts, and disconnect the VSV from cylinder
head and timing belt cover.

12.  REMOVE RH NO.3 TIMING BELT COVER

Remove the three bolts and timing belt cover.

13.  REMOVE LH NO.3 TIMING BELT COVER

(a)  Remove the four mounting bolts.
(b) Disconnect 

the cord grommet from the timing belt cover,

and remove the timing belt cover.

(c)  Remove the cord grommet from the high–tension cord.

14.  DISCONNECT RADIATOR HOSE FROM WATER INLET

15.  REMOVE DRIVE BELT IDLER PULLEY

Remove the pulley bolt, cover plate and idler pulley.

–

COOLIING SYSTEM

Electronically Controlled Hydraulic
Cooling Fan (Hydraulic Pump)

CO–29

15.  REMOVE RH NO.2 TIMING BELT COVER

(a)  Disconnect the cam position sensor connector from the

ignition coil bracket.

(b) Disconnect 

the 

cam position sensor wire from the clamp

on the timing belt cover.

(c)  Remove the five mounting bolts.
(d)  Disconnect the wire clamp from the timing belt cover,

and remove the timing belt cover and four gasket.

16.  REMOVE LH NO.2 TIMING BELT COVER

(a) Disconnect 

the 

cam position sensor wire from the clamp

on the timing belt cover.

(b)  Disconnect the cam position sensor connector.
(c)  Remove the three mounting bolts.
(d)  Disconnect the connector grommet from the timing belt

cover, and remove the timing belt cover and two
gaskets.

17.  DISCONNECT PRESSURE AND SUCTION HOSES FROM

HYDRAULIC PUMP

18.  REMOVE HYDRAULIC PUMP

(a)  Disconnect the solenoid valve connector.
(b)  Remove the two mounting bolts and two nuts.
(c)  Disconnect the engine speed sensor wire clamp.
(d)  Remove the hydraulic pump.

CO–30

–

COOLIING SYSTEM

Electronically Controlled Hydraulic
Cooling Fan (Hydraulic Pump)