Lexus RX300 (MCU15). Manual — part 439
A05222
Front
Recessed Heat Bolt
8 mm Hexagon Wrench
A05219
7
8
5
6
3
4
1
2
7
8
5
6
3
4
1
2
12 Pointed Head Bolt
Front
P12424
EM–40
–
ENGINE MECHANICAL
CYLINDER HEAD
LEXUS RX300 (RM785E)
36.
REMOVE CYLINDER HEADS
(a)
Using an 8 mm hexagon wrench, remove the cylinder
head (recessed head) bolt on each cylinder head, then re-
peat for the other side, as shown.
(b)
Uniformly loosen and remove the 8 cylinder head (12
pointed head) bolts on each cylinder head, in several
passes, in the sequence shown, then repeat for the other
side, as shown. Remove the 16 cylinder head bolts and
plate washers.
NOTICE:
Head warpage or cracking could result from removing
bolts in an incorrect order.
(c)
Lift the cylinder head from the dowels on the cylinder
block and place the 2 cylinder heads on wooden blocks
on a bench.
HINT:
If the cylinder head is difficult to lift off, pry between the cylinder
head and cylinder block with a screwdriver.
NOTICE:
Be careful not to damage the contact surfaces of the cylin-
der head and cylinder block.
EM0KI–02
P12683
A05224
SST
P12686
P12720
Magnetic Finger
A05276
–
ENGINE MECHANICAL
CYLINDER HEAD
EM–41
LEXUS RX300 (RM785E)
DISASSEMBLY
1.
REMOVE VALVE LIFTERS AND SHIMS
HINT:
Arrange the valve lifters and shims in the correct order.
2.
REMOVE VALVES
(a)
Using SST, compress the valve spring and remove the 2
keepers.
SST
09202–70020 (09202–00010)
(b)
Remove the spring retainer.
(c)
Remove the valve spring.
(d)
Remove the valve.
(e)
Using needle–nose pliers, remove the oil seal.
(f)
Using compressed air and a magnetic finger, remove the
spring seat by blowing air.
HINT:
Arrange the valves, valve springs, spring seats and spring re-
tainers in the correct order.
3.
REMOVE CYLINDER HEAD REAR COVER
Remove the 6 bolts, rear cover and gasket.
A05275
EM–42
–
ENGINE MECHANICAL
CYLINDER HEAD
LEXUS RX300 (RM785E)
4.
REMOVE OIL CONTROL VALVE FILTER
Remove the plug, gasket and valve filter.
EM0KJ–02
A05225
A05226
A05230
A05233
A05232
–
ENGINE MECHANICAL
CYLINDER HEAD
EM–43
LEXUS RX300 (RM785E)
INSPECTION
1.
CLEAN TOP SURFACES OF PISTONS AND CYL-
INDER BLOCK
(a)
Turn the crankshaft, and bring each piston to top dead
center (TDC). Using a gasket scraper, remove all the car-
bon from the piston top surface.
(b)
Using a gasket scraper, remove all the gasket material
from the cylinder block surface.
(c)
Using compressed air, blow carbon and oil from the bolt
holes.
CAUTION:
Protect your eyes when using high pressure compressed
air.
2.
REMOVE GASKET MATERIAL
Using a gasket scraper, remove all the gasket material from the
cylinder block contact surface.
NOTICE:
Be careful not to scratch the cylinder block contact sur-
face.
3.
CLEAN COMBUSTION CHAMBERS
Using a wire brush, remove all the carbon from the combustion
chambers.
NOTICE:
Be careful not to scratch the cylinder block contact sur-
face.
4.
CLEAN CYLINDER HEADS
Using a soft brush and solvent, thoroughly clean the cylinder
head.
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