LEXUS LS430 2003 Factory Repair Manual

Fig. 336: Measuring Tension Of Valve Spring Using Spring Tester
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
c. Using a spring tester, measure the tension of the valve spring at the specified installed length.
Standard:
204 to 226 N (20.8 to 23.0 kgf, 45.9 to 50.7 lbf)
at 35.04 mm (1.3795 in.)
If the tension is not as specified, replace the valve spring.
Fig. 337: Measuring Inside Diameter Of Guide Bush Using Caliper Gauge (Intake Valve Guide

Bush)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
9.INSPECT INTAKE VALVE GUIDE BUSH
a. Using a caliper gauge, measure the inside diameter of the guide bush.
Bush inside diameter:
5.510 to 5.530 mm (0.2169 to 0.2177 in.)
If the journal diameter is not as specified, check the oil clearance.
b. Subtract the valve stem diameter measurement (see step 6) from the guide bush inside diameter
measurement.
Standard oil clearance:
0.025 to 0.060 mm (0.0010 to 0.0024 in.)
Maximum oil clearance: 0.08 mm (0.0031 in.)
If the clearance is greater than the maximum, replace the valve and guide bush (see steps 11 and 12).

Fig. 338: Measuring Inside Diameter Of Guide Bush Using Caliper Gauge (Exhaust Valve Guide
Bush)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
10.INSPECT EXHAUST VALVE GUIDE BUSH
a. Using a caliper gauge, measure the inside diameter of the guide bush.
Bush inside diameter:
5.510 to 5.530 mm (0.2169 to 0.2177 in.)
If the journal diameter is not as specified, check the oil clearance.
b. Subtract the valve stem diameter measurement (see step 7) from the guide bush inside diameter
measurement.

Standard oil clearance:
0.030 to 0.065 mm (0.0012 to 0.0026 in.)
Maximum oil clearance: 0.10 mm (0.0039 in.)
If the clearance is greater than the maximum, replace the valve and guide bush (see steps 12 and 14).
Fig. 339: Heating Cylinder Head

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
11.REMOVE INTAKE VALVE GUIDE BUSH
a. Gradually heat the cylinder head to approximately 80 to 100°C (176 to 212° F).

Fig. 340: Taping Out Guide Bush Using SST And Hammer
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
b. Using SST and a hammer, tap out the guide bush.
SST 09201-01055, 09950-70010 (09951-07100)

Fig. 341: Heating Cylinder Head
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
12.REMOVE EXHAUST VALVE GUIDE BUSH
a. Gradually heat the cylinder head to approximately 80 to 100° C (176 to 212° F).

Fig. 342: Taping Out Guide Bush Using SST And Hammer
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
b. Using SST and a hammer, tap out the guide bush.
SST 09201-01055, 09950-70010 (09951-07100)

Fig. 343: Measuring Bush Bore Diameter Of Cylinder Head Using Caliper Gauge
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
13.INSTALL INTAKE VALVE GUIDE BUSH
a. Using a caliper gauge, measure the bush bore diameter of the cylinder head.
b. Select a new guide bush (STD or O/S 0.05).
GUIDE BUSH REFERENCE
If the bush bore diameter of the cylinder head is greater than 10.306 mm (0.4057 in.), machine the
bush bore diameter to between 10.335 and 10.356 mm (0.4068 to 0.4077 in.).
If the bush bore diameter of the cylinder head is greater than 10.356 mm (0.4077 in.), replace the
cylinder head.
Bush sizeBush bore diameter
Use STD10.285 to 10.306 mm (0.4049 to 0.4057 in.)
Use O/S 0.0510.335 to 10.356 mm (0.4068 to 0.4077 in.)

Fig. 344: Measuring Intake And Exhaust Dimension
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
HINT:
Different the bushes are used for the intake and exhaust.
Bush length: 34.5 mm (1.358 in.)

Fig. 345: Taping Guide Bush Using SST And Hammer
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
c. Gradually heat the cylinder head to approximately 80 to 100° C (176 to 212° F).
d. Using SST and a hammer, tap in a new guide bush to the specified protrusion height.
SST 09201-01055, 09950-70010 (09951-07100)
<0033005500520057005500580056004c005200510003004b0048004c004a004b00570003000b002b000c001d0003001c001100150003005700520003001c0011001b0003005000500003000b00130011001600190015000300570052000300130011001600
1b00190003004c00510011000c[