Lexus SC300 / Lexus SC400. Manual — part 437
(e) Remove the bearing caps.
(f) Measure the Plastigage at its widest point.
Standard oil clearance:
0.035–0.072 mm
(0.0014–0.0028 in.)
Maximum oil clearance:
0.10 mm (0.039 in.)
If the oil clearance is greater than maximum, replace the cam-
shaft. If necessary, replace the bearing caps and cylinder
head as a set.
(g) Completely remove the Plastigage.
F.
Inspect camshaft thrust clearance
(a) Install the camshafts.
(See step 2 on page EM–55)
(b) Using a dial indicator, measure the thrust clearance
while moving the camshaft back and forth.
Standard thrust clearance: 0.080–0.190 mm
(0.0031–0.0075 in.)
Maximum thrust clearance: 0.30 mm (0.0118 in.)
If the thrust clearance is greater than maximum, replace the
camshaft. If necessary, replace the bearing caps and cylin-
der head as a set.
11. INSPECT VALVE LIFTERS AND LIFTER BORES
(a) Using a caliper gauge, measure the lifter bore diameter
of the cylinder head.
Lifter bore diameter:
31.000–31.016 mm
(1.2205–1.2211 in.)
(b) Using a micrometer, measure the lifter diameter.
Lifter diameter:
30.966–30.976 mm
(1.2191–1.2195 in.)
EM–50
–
ENGINE MECHANICAL
Cylinder Head
(c) Subtract the lifter diameter measurement from the lifter
bore diameter measurement.
Standard oil clearance:
0.024–0.050 mm
(0.0009–0.0020 in.)
Maximum oil clearance:
0.07 mm (0.0028 in.)
If the oil clearance is greater than maximum, replace the lifter.
If necessary, replace the cylinder head.
12. INSPECT AIR INTAKE CHAMBER
Using a precision straight edge and feeler gauge, measure
the surfaces contacting the intake manifold for warpage.
Maximum warpage:
0.15 mm (0.0059 in.)
If warpage is greater than maximum, replace the chamber.
13. INSPECT
INTAKE
MANIFOLD
Using a precision straight edge and feeler gauge, measure
the surfaces contacting the cylinder head and air intake
chamber for warpage.
Maximum warpage:
0.15 mm (0.0059 in.)
If warpage is greater than maximum, replace the manifold.
14. INSPECT EXHAUST MANIFOLDS
Using a precision straight edge and feeler gauge, measure
the surfaces contacting the cylinder head for warpage.
Maximum warpage:
0.8 mm (0.031 in.)
If warpage is greater than maximum, replace the manifold.
15. INSPECT CYLINDER HEAD BOLTS
Using a vernier caliper, measure the thread outside diameter
of the bolt.
Standard outside diameter: 10.8–11.0 mm
(0.425–0.433 in.)
Minimum outside diameter: 10.7 mm (0.421 in.)
If the diameter is less than minimum, replace the bolt.
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ENGINE MECHANICAL
Cylinder Head
EM–51
ASSEMBLY OF CYLINDER HEAD
(See Components on page EM–35)
HINT:
•
Thoroughly clean all parts to be assembled.
•
Before installing the parts, apply new engine oil to all
sliding and rotating surfaces.
•
Replace all gaskets and oil seals with new ones.
1. INSTALL
HEATER
UNION
HINT: When using a new cylinder head, heater union must be
installed.
(a) Apply adhesive to the end of the heater union as shown
in the illustration.
Adhesive: Part No. 08833–00070, THREE BOND 1324 or
equivalent
(b) Using a wooden block and hammer, tap in a new heater
union, leaving 73 mm (2.87 in.) protruding from the
cylinder head.
NOTICE: Do not tap it in too far.
2.
INSTALL EGR COOLER
Install a new gasket and EGR cooler with the eight bolts.
Torque: 14
N
⋅
m (140 kgf
⋅
cm, 10 ft
⋅
lbf)
3. INSTALL ENGINE COOLANT TEMPERATURE SENSOR
AND SENDER GAUGE
Torque: 20
N
⋅
m (200 kgf
⋅
cm, 14 ft
⋅
lbf)
4. INSTALL GROUND STRAP AND THROTTLE CABLE
BRACKET
5.
INSTALL ENGINE HANGERS
Torque: 39
N
⋅
m (400 kgf
⋅
cm, 29 ft
⋅
lbf)
EM–52
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ENGINE MECHANICAL
Cylinder Head
3. INSTALL
VALVES
(a) Install new oil seal on the valve guide bushing.
HINT: The intake valve oil seal is brown and the exhaust valve
oil seal is black.
(b) Install the following parts:
(1) Valve
(2) Spring seat
(3) Valve spring
(4) Spring retainer
HINT: Install the valve spring, facing the painted mark up-
ward.
(c) Using
SST,
compress the valve spring and place the two
keepers around the valve stem.
SST 09202–70010
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ENGINE MECHANICAL
Cylinder Head
EM–53
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