Lexus SC300 / Lexus SC400. Service manual - part 565

COMPONENTS FOR REMOVAL AND
INSTALLATION (Cont’d)

–

ENGINE MECHANICAL

Cylinder Heads

EM–59

REMOVAL OF CYLINDER HEADS

(See Components on pages 

EM–58

 and 59)

1. 

DISCONNECT TIMING BELT FROM CAMSHAFT TIMING
PULLEYS
(See steps 1 to 28 on pages 

EM–35

 to 42)

2.  REMOVE CAMSHAFT TIMING PULLEYS AND

HYDRAULIC PUMP
(See steps 29 and 31 on pages 

EM–42

 and 43)

HINT:

•

Be careful not to drop anything inside the timing belt
cover.

•

Do not allow the timing belt to come into contact with oil,
water or dust.

3. 

DISCONNECT PS PUMP FROM LH CYLINDER HEAD
(a) Disconnect the vacuum hose from the  air intake

chamber.

(b)  Remove the three bolts and nut, and disconnect the PS

pump.

HINT: Put aside the PS pump, and suspend it.

4. 

REMOVE CATALYTIC CONVERTERS (MAIN)
(a)  Remove the four bolts holding the pipe support bracket

to the transmission.

(b)  Remove the four bolts and nuts holding the catalytic

converters to the front exhaust pipe. Remove the pipe
support bracket.

(c)  Disconnect the front exhaust pipe from the catalytic

converter, and remove the two gaskets.

(d)  Remove the three nuts, catalytic converter and gasket.

Remove the two catalytic converters.

EM–60

–

ENGINE MECHANICAL

Cylinder Heads

5. 

REMOVE THROTTLE BODY COVER
(a)  Remove the mounting cap nut.
(b)  Loosen the two bolts, and remove the throttle body

cover.

6.  DISCONNECT CONTROL CABLES FROM THROTTLE

BODY
Disconnect the following cables:

(1)

Accelerator cable

(2)

A/T throttle control cable

(3)

(w/ Cruise Control System)
Cruise control actuator cable

7. 

REMOVE RH IGNITION COIL
Remove the two bolts and ignition coil.

8. 

REMOVE WATER INLET AND INLET HOUSING
(a)  Disconnect the water by–pass hose from the ISC valve.

(b)  Remove the two bolts holding the water inlet housing to

the water pump.

(c)  Pull out the water inlet and inlet housing assembly.
(d)  Remove the O–ring from the water inlet housing.

–

ENGINE MECHANICAL

Cylinder Heads

EM–61

9. 

REMOVE TIMING BELT REAR PLATES
Remove the two bolts and rear plate. Remove the two rear
plates.

10. REMOVE VACUUM PIPE

(a)  Disconnect the following hoses:

(1)

(USA Spec.)
Vacuum hose from throttle body

(2)

(Exc. USA Spec.)
Three vacuum hoses from throttle body

(3)

Vacuum hose from fuel pressure regulator

(4)

Two vacuum hoses from VSV for fuel pressure con-
trol system

(5)

(Exc. USA Spec.)
Two vacuum hoses from EGR vacuum modulator

(6)

Two vacuum hoses (from VSV for EVAP system)
from vacuum pipe

(7)

Vacuum hose (from VSV for fuel pressure control
system) from air intake chamber

(8)

Vacuum hose (from charcoal canister) from vacu-
um pipe.

(b)  Remove the two bolts, the vacuum pipe and vacuum

hoses assembly.

EM–62

–

ENGINE MECHANICAL

Cylinder Heads