Lexus SC300 / Lexus SC400. Manual - part 567

24.  DISCONNECT EGR PIPE FROM RH CYLINDER HEAD

Remove the bolt holding the EGR pipe to the RH cylinder
head, and disconnect the EGR pipe.

25.  DISCONNECT ENGINE WIRE FROM INTAKE MANIFOLD

Remove the two bolts, and disconnect the engine wire.

26.  DISCONNECT ENGINE WIRE FROM DELIVERY PIPES,

REAR WATER BY–PASS JOINT AND RH CYLINDER
HEAD
(a)  Remove the four bolts holding the engine wire to the

delivery pipes, and disconnect the engine wire from the
delivery pipes.

(b) Remove 

the two bolts holding the engine wire to the rear

water by–pass joint, and disconnect the engine wire
from the rear water by–pass joint.

(c) Remove 

the two bolts holding the engine wire to the rear

side of the RH cylinder head, and disconnect the engine
wire from the engine wire RH cylinder head.

(d)  Disconnect the two engine wire connectors from the

connector bracket on the front side of the LH delivery
pipe.

(e)  Disconnect the eight injector connectors.

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ENGINE MECHANICAL

Cylinder Heads

EM–67

27.  REMOVE FUEL RETURN PIPE

(a)  Remove the bolt holding the fuel return pipe to the rear

side of the LH cylinder head.

(b)  Remove the union bolt, two gaskets and return pipe.

28.  REMOVE DELIVERY PIPES AND INJECTORS

(a)  Remove the four nuts holding the delivery pipe to the

intake manifold.

(b)  Remove the connector bracket, the two delivery pipes,

eight injectors assembly, four spacers  and eight
insulators.

NOTICE: Be careful not to drop the injectors.

(c)  Remove the eight injectors from the delivery pipes.
(d)  Remove the O–ring and grommet from each injector.

29. REMOVE 

INTAKE 

MANIFOLD

Remove the six bolts, four nuts, intake manifold and two gas-
kets.

30.  REMOVE FRONT WATER BY–PASS JOINT

(a)  Disconnect the following connectors:

(1) Water temperature sensor connector
(2) Cold start injector time switch connector
(3) Water temperature sender gauge connector

(b)  Remove the bolt, and disconnect the engine wire clamp

from the water by–pass joint.

EM–68

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ENGINE MECHANICAL

Cylinder Heads

(c)  Remove the four nuts, water by–pass joint and two

gaskets.

31.  REMOVE REAR WATER BY–PASS JOINT

(a)  Remove the bolt holding the water by–pass pipe to the

engine hanger.

(b)  Remove the four nuts, water by–pass joint and two

gaskets.

32.  REMOVE OIL DIPSTICK AND GUIDE FOR ENGINE

(a)  Remove the mounting bolt.
(b)  Pull out the dipstick guide together with the dipstick.
(c)  Remove the O–ring from the dipstick guide.

33.  REMOVE OIL DIPSTICK AND GUIDE FOR A/T

34.  REMOVE EGR PIPE

(a)  Remove the two nuts holding the EGR pipe to the RH

exhaust pipe.

(b)  Remove the EGR pipe and gasket.

35.  DISCONNECT GROUND STRAP FROM RH CYLINDER

HEAD

36. DISCONNECT 

ENGINE WIRE FROM RH CYLINDER HEAD

Remove the two bolts, and disconnect the engine wire.

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ENGINE MECHANICAL

Cylinder Heads

EM–69

37. DISCONNECT 

ENGINE 

WIRE 

FROM LH CYLINDER HEAD

Remove the five bolts, and disconnect the engine wire.

38.  REMOVE ENGINE HANGERS

Remove the two bolts and engine hanger. Remove the two
engine hangers.

39.  REMOVE CYLINDER HEAD COVERS

Remove the eight bolts, seal washers, cylinder head cover
and gasket. Remove the two cylinder head covers.

40.  IF NECESSARY, REMOVE SEMI–CIRCULAR PLUGS

41. REMOVE 

CAMSHAFTS

NOTICE: Since the thrust clearance of the camshaft is
small, the camshaft must be held level while it is being
removed. If the camshaft is not kept level, the portion of
the cylinder head receiving the shaft thrust may crack or
be damaged, causing due the camshaft to seize or break.
To avoid this, the following steps should be carried out.

A.

Remove exhaust camshaft from RH cylinder head
(a)  Bring the service bolt hole of the driven sub–gear

upward by turning the hexagon wrench head portion of
the exhaust camshaft with a wrench.

(b)  Secure the exhaust camshaft sub–gear to the driven

gear with a service bolt.

Recommended service bolt:

Thread diameter 6 mm
Thread pitch 1.0 mm
Bolt length 16–20 mm (0.63–0.79 in.)

HINT: When removing the camshaft, make certain that the
torsional spring force of the sub–gear has been eliminated by
the above operation.

EM–70

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ENGINE MECHANICAL

Cylinder Heads