2003 LEXUS LS430 cylinder head

Fig. 375: Measuring Journal Diameter Using Micrometer
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
d. Check the oil clearance.
1. Clean the bearing caps and journals.
2. Check the bearings for flaking and scoring.
If the bearings are damaged, replace the bearing caps and cylinder head as a set.
3. Place the No. 2 camshaft on the cylinder head.
4. Lay a strip of Plastigage across each of the journals.
5. Install the bearing caps (see OVERHAUL
).

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. 384: Checking Timing Tube Turns Smoothly
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
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
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:
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.)

Fig. 391: Measuring Journal Diameter Using Micrometer
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
d. Check the oil clearance.
1. Clean the bearing caps and journals.
2. Check the bearings for flaking and scoring.
If the bearings are damaged, replace the bearing caps and cylinder head as a set.
3. Place the No. 4 camshaft on the cylinder head.
4. Lay a strip of Plastigage across each of the journals.
5. Install the bearing caps (see OVERHAUL
).
6. Remove the bearing caps.
7. Measure the Plastigage at its widest point.
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Maximum oil clearance: 0.100 mm (0.0039 in.)
If the oil clearance is greater than the maximum, replace the No. 4 camshaft. If necessary,
replace the bearing caps and cylinder head as a set.
8. Completely remove the Plastigage.
9. Remove the No. 4 camshaft.
Fig. 392: Identifying Plastigage

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

Fig. 393: Measuring Plastigage At Widest Point
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
e. Check the thrust clearance.
f. Install the camshaft (see OVERHAUL
).
g. Using a dial indicator, measure the thrust clearance while moving the No. 4 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. 4 camshaft. If necessary,
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h. Remove the No. 4 camshaft.
20.INSPECT CYLINDER HEAD SET BOLT
a. Usin
g a vernier caliper, measure the thread outside diameter of the bolt.

Fig. 395: Measuring Thread Outside Diameter Of Bolt Using Vernier Caliper
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
21.INSTALL SPARK PLUG TUBE
HINT:When using a new cylinder head, the 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 wooden block and hammer, tap in a new spark tube until there is 48.4 to 49.6 mm (1.906 to