Lexus ES300 (1997 year). Service manual — part 467
P12496
P13235
P13236
P13224
SST
–
ENGINE MECHANICAL
CYLINDER HEAD
EM–49
786
1997 LEXUS ES300 (RM511U)
26.
INSPECT 12 POINTED HEAD CYLINDER HEAD
BOLTS
Using vernier calipers, measure the tension portion diameter of
the bolt.
Standard outside diameter:
8.95 – 9.05 mm (0.3524 – 0.3563 in.)
Minimum outside diameter: 8.75 mm (0.3445 in.)
If the diameter is less than minimum, replace the bolt.
27.
IF NECESSARY, REPLACE SPARK PLUG TUBE
GASKETS
(a)
Bend up the tab on the ventilation baffle plate which pre-
vents the gasket from the slipping out.
(b)
Using a screwdriver and hammer, tap out the gasket.
(c)
Using needle–nose pliers, pry out the gasket.
(d)
Using SST and a hammer, tap in a new gasket until its sur-
face is flush with the upper edge of the cylinder head cov-
er.
SST
09608–03071
(e)
Apply a light coat of MP grease to the gasket lip.
(f)
Return the ventilation plate tab to its original position.
EM046–02
P11511
10 – 15 mm (0.39 – 0.59 in.)
Adhesive
P12572
Protrusion
P12869
Flush
P12719
SST
EM–50
–
ENGINE MECHANICAL
CYLINDER HEAD
787
1997 LEXUS ES300 (RM511U)
REASSEMBLY
HINT:
Thoroughly clean all parts to be assembled.
Before installing the parts, apply new engine oil to all slid-
ing and rotating surfaces.
Replace all gaskets and oil seals with new ones.
1.
INSTALL SPARK PLUG TUBES
HINT:
When using a new cylinder head, spark plug tubes must be
installed.
(a)
Apply adhesive to the end of the spark plug tube.
Adhesive: Part No. 08833–00070, THREE BOND 1324
or equivalent
(b)
Using a press, press in a new spark plug tube until there
is 42.4 – 43.4 mm (1.669 – 1.709 in.) protruding from the
camshaft bearing cap installation surface of the cylinder
head.
NOTICE:
Avoid pressing a new spark plug tube in too far by measur-
ing the amount of the protrusion while pressing.
2.
INSTALL PCV PIPES
HINT:
When using a new cylinder head, PCV pipe must be installed.
Using a wooden block and hammer, tap in a new PCV pipe until
its top side is flush with the cylinder head edge.
NOTICE:
Be careful not to damage the cylinder head edge.
3.
INSTALL VALVES
(a)
Using SST, push in a new oil seal.
SST
09201–41020
S05923
Intake
Exhaust
Mark
”NOK”
Light Brown Surface
Gray Surface
P12668
(4)
(3)
(2)
(1)
P12476
SST
P12687
–
ENGINE MECHANICAL
CYLINDER HEAD
EM–51
788
1997 LEXUS ES300 (RM511U)
HINT:
The intake valve oil seal is light brown and the exhaust valve oil
seal is gray.
NOTICE:
Pay much attention when assembling the oil seal for intake
and exhaust. Assembling the wrong one may cause a fail-
ure.
(b)
Install these parts:
(1)
Valve
(2)
Spring seat
(3)
Valve spring
(4)
Spring retainer
(c)
Using SST, compress the valve spring and place the 2
keepers around the valve stem.
SST
09202–70020 (09202–00010)
(d)
Using a plastic–faced hammer, lightly tap the valve stem
tip to ensure a proper fit.
4.
INSTALL VALVE LIFTERS AND SHIMS
(a)
Install the valve lifter and shim.
(b)
Check that the valve lifter rotates smoothly by hand.
EM047–02
P12393
P12736
12 Pointed Head Bolt
Front
8
7
6
5
4
3
2
1
8
7
6
5
4
3
2
1
P25742
Painted Mark
Front
90
°
90
°
EM–52
–
ENGINE MECHANICAL
CYLINDER HEAD
789
1997 LEXUS ES300 (RM511U)
INSTALLATION
1.
PLACE CYLINDER HEAD ON CYLINDER BLOCK
(a)
Place 2 new cylinder head gaskets in position on the cylin-
der block.
NOTICE:
Be careful of the installation direction.
(b)
Place the 2 cylinder heads in position on the cylinder head
gaskets.
2.
INSTALL 12 POINTED HEAD CYLINDER HEAD BOLTS
HINT:
The cylinder head bolts are tightened in 2 progressive
steps (steps (c) and (e)).
If any bolt is broken or deformed, replace it.
(a)
Apply a light coat of engine oil on the threads and under
the heads of the cylinder head bolts.
(b)
Install the plate washer to the cylinder head bolt.
(c)
Install and uniformly tighten the cylinder head bolts on
each cylinder head, in several passes, in the sequence
shown, then repeat for the other side, as shown.
Torque: 54 N·m (550 kgf·cm, 40 ft·lbf)
If any of the cylinder head bolts does not meet the torque speci-
fication, replace the cylinder head bolt.
(d)
Mark the front of the cylinder head bolt head with paint.
(e)
Retighten the cylinder head bolts by 90
°
in the numerical
order shown.
(f)
Check that the painted mark is now at a 90
°
angle to the
front.
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