Lexus SC300 / Lexus SC400. Manual — part 433

CYLINDER HEAD

COMPONENTS FOR REMOVAL AND
INSPECTION

EM–34

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ENGINE MECHANICAL

Cylinder Head

COMPONENTS FOR REMOVAL AND
INSTALLATION (Cont’d)

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ENGINE MECHANICAL

Cylinder Head

EM–35

REMOVAL OF CYLINDER HEAD

(See Components on pages EM–34 and 35)

1. DISCONNECT HIGH–TENSION CORDS FROM SPARK

PLUGS
(See steps 1 to 8 on pages EM–10 and 11)

2. REMOVE

SPARK

PLUGS

(See step 2 on page IG–8)

3.

REMOVE DISTRIBUTOR AND CORDS
(See pages IG–11 and 12)

4.

REMOVE WATER PUMP PULLEY AND RADIATOR
(See steps 1 to 3, 6 and 7 on pages EM–64 to 66)

5.

DISCONNECT TIMING BELT FROM CAMSHAFT TIMING
PULLEYS
(See steps 2 to 5 on pages EM–24 and 25)
NOTICE:

•

Support the timing belt, so that the meshing of the
crankshaft timing pulley and timing belt does not shift.

•

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.

6.

REMOVE NO. 2 FRONT EXHAUST PIPE
(See step 2 on page EM–71)

7.

REMOVE EXHAUST MANIFOLDS
(a) Disconnect the two oxygen sensor connectors.
(b) Remove the four nuts and manifold heat insulator.

(c) Remove the four nuts, exhaust manifold and gasket.

Remove the No. 1 and No. 2 exhaust manifolds.

EM–36

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ENGINE MECHANICAL

Cylinder Head

8.

REMOVE WATER BY–PASS OUTLET AND NO. 1 WATER
BY–PASS PIPE
(a) Remove the two bolts, water by–pass outlet and No. 1

water by–pass pipe.

(b) Remove the three O–rings from the water by–pass

outlet and No. 1 water by–pass pipe.

9.

REMOVE WATER OUTLET AND NO. 1 BY–PASS HOSE
(a) Remove the two nuts, bolt and water outlet.
(b) Disconnect the No. 1 by–pass hose from the hose

clamp.

10. REMOVE VACUUM CONTROL VALVE SET AND NO. 2

VACUUM PIPE
(a) Disconnect the two connectors from the VSV.
(b) Disconnect the following hoses:

(1) Vacuum hose from ACIS vacuum tank
(2) Three vacuum hoses from VSV

(c) Remove the four nuts, vacuum control valve set and

vacuum pipe.

11. REMOVA OIL DIPSTICK GUIDES FOR ENGINE AND

TRANSMISSION (A/T)
(a) Disconnect the fuel return hose from the engine oil

dipstick guide.

(b) Remove the mounting bolt.
(c) Pull out the dipstick guide together with dipstick. Plug

the oil pan.

(d) Remove the O–ring from the dipstick guide.

12. REMOVE AIR INTAKE CHAMBER

(a) Remove the bolt, nut and intake chamber stay. Remove

the No. 1 and No. 2 stays.

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ENGINE MECHANICAL

Cylinder Head

EM–37