Lexus SC300 / Lexus SC400. Service manual - part 434

(b)  Disconnect the following hoses:

(1) Vacuum hose from brake booster union
(2) Vacuum hose (from ACIS vacuum tank)
(3) Vacuum sensing hose
(4) Air hose (from PS air control valve)

(c)  Remove the two bolts, and disconnect the data link

connector 1 and harness protector from the air intake
chamber.

(d)  Remove the five bolts, two nuts and air intake chamber

and gasket.

13.  REMOVE DELIVERY PIPE AND INJECTORS

(See steps 4, 5, 8 and 10 on pages FI–28 and 29)

14.  REMOVE NO. 1 AND NO. 2 FUEL PIPES

15.  DISCONNECT ENGINE WIRE FROM INTAKE MANIFOLD

(a)  Disconnect the following connectors:

(1) Engine coolant temperature sensor connector
(2) Engine coolant temperature sender gauge connec-

tor

(3) Two knock sensor connectors
(4) Oil pressure switch connector

(5) Oil level sensor connector
(6) A/C compressor connector

(b)  Remove the three nuts and two clamp bolts.
(c)  Remove the two bolts, and disconnect the harness

protector from the intake manifold.

16. REMOVE 

INTAKE 

MANIFOLD

(a)  Remove the two bolts and intake manifold stay.
(b)  Remove the six bolts, two nuts, intake manifold and

gasket.

EM–38

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ENGINE MECHANICAL

Cylinder Head

17. REMOVE NO. 3, No. 1 AND NO. 2 CYLINDER HEAD

COVERS
(a)  Remove the 12 bolts and four nuts.
(b)  Remove the cylinder head covers and gaskets.

18.  REMOVE CAMSHAFT TIMING PULLEYS

Hold the hexagon portion of the camshaft with a wrench, and
remove the pulley mount bolt and camshaft pulley.

19.  REMOVE NO. 4 TIMING BELT COVER

Remove the four bolts and timing belt cover.

20. REMOVE 

CAMSHAFTS

(a) Uniformly 

loosen and remove the four bearing cap bolts.

(b)  Using a screwdriver, pry out the two No. 1 camshaft

bearing caps and oil seals.

NOTICE: Be careful not to damage the cap. Tape the
screwdriver tip.

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ENGINE MECHANICAL

Cylinder Head

EM–39

(c)  Uniformly loosen and remove the 12 bearing cap bolts

in several passes in the sequence shown, and remove
the six bearing caps and camshaft. Remove the intake
and exhaust camshafts.

21. REMOVE 

CYLINDER 

HEAD

(a)  Using a 10 mm bi–hexagon wrench, uniformly loosen

and remove the ten cylinder head bolts in several
passes in the sequence shown.

NOTICE: Cylinder head warpage or cranking could result
from removing in incorrect order.
(b)  Remove the 14 plate washers.

(c)  Lift the cylinder head from the dowels on the cylinder

block. As the cylinder head is lifted, separate the heater
water hose from the union.

(d)  Place the head on wooden blocks on a bench.
If the cylinder head is difficult to lift off, pry with a screwdriver
between the cylinder head and block projection.
NOTICE: Be careful not to damage the contact surfaces
of the cylinder head and cylinder block.

EM–40

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ENGINE MECHANICAL

Cylinder Head

DISASSEMBLY OF CYLINDER HEAD

(See Components on page EM–35)

1.

REMOVE VALVE LIFTERS AND SHIMS

HINT: Store the valve lifters and shims in correct order.

2.

REMOVE VALVES
(a)  Using SST, compress the valve spring and remove the

two keepers.

SST 09202–70010
(b)  Remove the spring retainer, valve spring, valve and

spring seat.

HINT: Store the valves, valve springs, spring seats and spring
retainers in correct order.

(c)

Using needle–nose pliers, remove the oil seal.

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ENGINE MECHANICAL

Cylinder Head

EM–41