Lexus SC300 / Lexus SC400. 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
–
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.
–
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
–
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.
–
ENGINE MECHANICAL
Cylinder Head
EM–41
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