LEXUS LS430 2003 Factory Repair Manual

Fig. 376: Checking Oil Clearance
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
6. Remove the bearing caps.
7. Measure the Plastigage at its widest point.
Standard oil clearance:
0.030 to 0.067 mm (0.0012 to 0.0026 in.)
Maximum oil clearance: 0.100 mm (0.0039 in.)
If the oil clearance is greater than the maximum, replace the No. 2 camshaft. If
necessary, replace the bearing caps and cylinder head as a set.
8. Completely remove the Plastigage.
9. Remove the No. 2 camshaft.

Fig. 377: Measuring Plastigage At Widest Point
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e. Check the thrust clearance.
1. Install the camshaft (see OVERHAUL
).
2. Using a dial indicator, measure the thrust clearance while moving the camshaft back and
forth.
Standard thrust clearance:
0.030 to 0.075 mm (0.0012 to 0.0030 in.)
Maximum thrust clearance: 0.12 mm (0.0047 in.)
If the thrust clearance is greater than the maximum, replace the No. 2 camshaft. If necessary,
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Fig. 378: Measuring Thrust Clearance Using Dial Indicator
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3. Remove the No. 2 camshaft.
j.INSPECT NO.3 CAMSHAFT SUB-ASSY
a. Inspect the circle runout.
1. Place the camshaft on V-blocks.
2. 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 the maximum, replace the No. 3 camshaft.

Fig. 379: Measuring Circle Runout Center Journal Using Dial Indicator
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b. Using a micrometer, measure the cam lobe height.
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lobe height: 42.46 mm (1.6717 in.)
If the cam lobe height is less than the minimum, replace the No. 3 camshaft.

Fig. 380: Measuring Cam Lobe Height Using Micrometer
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c. Inspect the journal diameter of the camshaft.
1. Using a micrometer, measure the journal diameter of the No. 3 camshaft for the
camshaft bearing.
Journal diameter: 26.954 to 26.970 mm (1.0612 to 1.0618 in.)
If the
journal diameter is not as specified, check the oil clearance.

Fig. 381: Measuring Journal Diameter Using Micrometer
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
2. Using a micrometer, measure the journal diameter for the camshaft timing tube.
Journal diameter: 30.984 to 31.000 mm (1.2198 to 1.2205 in.)
If the journal diameter is not as specified, check the oil clearance.
d. Inspect the journal diameter of the camshaft timing tube.
1. Using a micrometer, measure the journal diameter.
Journal diameter: 39.955 to 39.964 mm (1.5730 to 1.5734 in.)

Fig. 382: Measuring Journal Diameter Using Micrometer (1 Of 2)
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If the
journal diameter is not as specified, check the oil clearance.

Fig. 383: Measuring Journal Diameter Using Micrometer ( Of 2)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

Fig. 384: Checking Timing Tube Turns Smoothly
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e. Install the timing tube to the No. 3 camshaft, and check that the timing tube turns smoothly.
If necessary, replace the timing tube and No. 3 camshaft.
f. Check the oil clearance.
1. Install the camshaft timing tube to the No. 3 camshaft (see OVERHAUL
).
2. Clean the bearing caps and journals.
3. Check that bearings for flaking and scoring.
If the bearings are damaged, replace the bearing caps and cylinder head as a set.
4. Place the No. 3 camshaft on the cylinder head.
5. Lay a strip of Plastigage across each of the journals.
Install the bearing caps (see OVERHAUL
).

Fig. 385: Identifying Plastigage
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6. Remove the bearing caps.
7. Measure the Plastigage at its widest point.
STANDARD OIL CLEARANCE:
STANDARD OIL CLEARANCE SPECIFICATIONS
MAXIMUM OIL CLEARANCE:
MAXIMUM OIL CLEARANCE SPECIFICATIONS
If the oil clearance is greater than the maximum, replace the No. 3 camshaft and timing tube.
If necessar
y, replace the bearing caps and cylinder head as a set.
Camshaft journal0.030 to 0.067 mm (0.0012 to 0.0026 in.)
Camshaft timing tube journal0.036 to 0.057 mm (0.0014 to 0.0022 in.)
Camshaft journal0.100 mm (0.0039 in.)
Camshaft timing tube journal0.085 mm (0.0033 in.)