Lexus GS300/400 (2000 year). Service manual — part 138
Z02456
Width
75
°
45
°
A02710
Z02457
Deviation
EM0801
EM0281
EM–44
–
ENGINE MECHANICAL (2JZ–GE)
CYLINDER HEAD
1398
(2)
If the seating is too low on the valve face, use 75
°
and 45
°
cutters to correct the seat.
(d)
Hand–lap the valve and valve seat with an abrasive com-
pound.
(e)
After hand–lapping, clean the valve and valve seat.
8.
INSPECT VALVE SPRINGS
(a)
Using a steel square, measure the deviation of the valve
spring.
Maximum deviation: 2.0 mm (0.079 in.)
If deviation is greater than maximum, replace the valve spring.
(b)
Using vernier calipers, measure the free length of the
valve spring.
Free length:
Pink painted mark
43.71 mm (1.7209 in.)
Yellow painted mark
44.10 mm (1.7362 in.)
If the free length is not as specified, replace the valve spring.
(c)
Using a spring tester, measure the tension of the valve
spring at the specified installed length.
Installed tension:
186.2 – 205.8 N (19.0 – 21.0 kgf, 41.9 – 46.3 lbf)
at 34.5 mm (1.358 in.)
If the installed tension is not as specified, replace the valve
spring.
A02820
EM2011
EM2538
A02817
Plastigage
–
ENGINE MECHANICAL (2JZ–GE)
CYLINDER HEAD
EM–45
1399
9.
INSPECT CAMSHAFTS FOR RUNOUT
(a)
Place the camshaft on V–blocks.
(b)
Using a dial indicator, measure the circle runout at the
center journal.
Maximum circle runout: 0.08 mm (0.0031 in.)
If the circle runout is greater than maximum, replace the cam-
shaft.
10.
INSPECT CAM LOBES
Using a micrometer, measure the cam lobe height.
Standard cam lobe height:
Intake
44.310 – 44.360 mm (1.7445 – 1.7465 in.)
Exhaust
44.250 – 44.350 mm (1.7421 – 1.7461 in.)
Minimum cam lobe height:
Intake
44.16 mm (1.7386 in.)
Exhaust
44.10 mm (1.7362 in.)
If the cam lobe height is less than minimum, replace the cam-
shaft.
11.
INSPECT CAMSHAFT JOURNALS
Using a micrometer, measure the journal diameter.
Journal diameter:
28.949 – 28.965 mm (1.1397 – 1.1404 in.)
If the journal diameter is not as specified, check the oil clear-
ance.
12.
INSPECT CAMSHAFT BEARING
Check the bearings for flaking and scoring.
If the bearings are damaged, replace the bearing caps and cyl-
inder head as a set.
13.
INSPECT CAMSHAFT JOURNAL OIL CLEARANCE
(a)
Clean the bearing caps and camshaft journals.
(b)
Place the camshafts on the cylinder head.
(c)
Lay a strip of Plastigage across each of the camshaft jour-
nals.
(d)
Install the bearing caps. (See page
Torque: 20 N·m (200 kgf·cm, 14 ft·lbf)
NOTICE:
Do not turn the camshaft.
(e)
Remove the bearing caps.
A02718
A02815
A02688
EM–46
–
ENGINE MECHANICAL (2JZ–GE)
CYLINDER HEAD
1400
(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 (0.0039 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.
14.
INSPECT CAMSHAFT THRUST CLEARANCE
(a)
Install the camshafts. (See page
(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 cylinder
head as a set.
15.
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.)
(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.
A02830
A02829
A02831
A02828
About
50 mm
Compressed
Thread
–
ENGINE MECHANICAL (2JZ–GE)
CYLINDER HEAD
EM–47
1401
16.
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.
17.
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.
18.
INSPECT EXHAUST MANIFOLD
Using a precision straight edge and feeler gauge, measure the
surfaces contacting the cylinder head for warpage.
Maximum warpage: 0.50 mm (0.0196 in.)
If warpage is greater than maximum, replace the manifold.
19.
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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