LEXUS LS430 2003 Factory Repair Manual

Fig. 11: Aligning Groove With Timing Mark
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b. Check that the timing marks (1 dot mark) of the intake and exhaust camshaft gears on the LH bank
are aligned.
If not, turn the crankshaft 1 revolution (360°) and ali
gn the mark as above.

Fig. 12: Aligning Mark Intake And Exhaust Camshaft Gears
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5.INSPECT VALVE CLEARANCE
a. Check only the valves indicated by diagonal lines in the illustration.
1. Using a feeler gauge, measure the clearance between the valve lifter and camshaft.
VALVE CLEARANCE (COLD):
VALVE CLEARANCE SPECIFICATIONS
2. Record valve clearance measurements that are out of the specified range. These
measurements will be used later to determine the size of the adjustment shim to be installed.
Intake0.15 to 0.25 mm (0.006 to 0.010 in.)
Exhaust0.25 to 0.35 mm (0.010 to 0.014 in.)

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b. Turn the crankshaft 1 revolution (360°) and align the marks of the intake and exhaust camshaft
gears on the LH bank (see procedure in step 4).

c. Check only the valves indicated by diagonal lines in the illustration. Measure the valve clearance
(see procedure in step (a)).
Fig. 14: Measuring Valve Clearance

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6.REMOVE CAMSHAFT (See REPLACEMENT
)
7.REMOVE NO.3 CAMSHAFT SUB-ASSY (See REPLACEMENT
)
8.ADJUST VALVE CLEARANCE
a. Using a powerful magnet, remove the valve lifter and adjusting shim.
Fig. 15: Identifying Powerful Magnet

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b. Determine the replacement adjusting shim size according to these formulas and charts:
1. Using a micrometer, measure the thickness of the removed shim.
2. Calculate the thickness of a new shim so that the valve clearance comes within the specified
value.

T = Thickness of removed shim
A = Measured valve clearance
N = Thickness of new shim
SHIM THICKNESS REFERENCE
c. Select a new shim with a thickness as close as possible to the calculated value.
Fig. 16: Measuring Thickness Of Shim Using Micrometer

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HINT:
Shims are available in 41 increments of 0.020 mm (0.0008 in.), from 2.00 mm (0.0787 in.) to 2.80
mm (0.1102).
d. Install a new adjusting shim to the spring retainer.
e. Install the valve lifter.
IntakeN = T + (A - 0.20 mm (0.008 in.))
ExhaustN = T + (A - 0.30 mm (0.012 in.))

Fig. 17: Adjusting Shim Selection Chart (Intake)
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Fig. 18: Adjusting Shim Selection Chart (Exhaust)
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9.INSTALL NO.3 CAMSHAFT SUB-ASSY (See REPLACEMENT
)
10.INSTALL CAMSHAFT (See REPLACEMENT
)
11.INSTALL CYLINDER HEAD COVER SUB-ASSY LH (See REPLACEMENT
)
12.INSTALL CYLINDER HEAD COVER SUB-ASSY (See REPLACEMENT
)
13.INSTALL V-BANK COVER
COMPONENTS

Fig. 19: Exploded View Of Partial Engine Assy Components (1 Of 15)
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Fig. 20: Exploded View Of Partial Engine Assy Components (2 Of 15)
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