2003 LEXUS LS430 lock

If deep scratches are present, replace the cylinder block sub-assy.
Fig. 435: Identifying Cylinder Block Sub
-Assy
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
e. Inspect the cylinder bore diameter.
HINT:
There are 3 sizes of the standard cylinder bore diameter, marked "1", "2" and "3" accordingly. The
mark is stamped on the top of the cylinder block.
If deep scratches are present, replace the c
ylinder block sub-assy.

Fig. 436: Identifying Cylinder Bore Diameter
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
1. Using a cylinder gauge, measure the cylinder bore diameter at positions A and B in the thrust
and axial directions.
STANDARD DIAMETER:
CYLINDER BORE DIAMETER
Maximum diameter: 91.149 mm (3.5885 in.)
If the avera
ge of the diameter is greater than the maximum, replace the cylinder block.
Mark 191.000 to 91.008 mm (3.5827 to 3.5830 in.)
Mark 291.008 to 91.021 mm (3.5830 to 3.5835 in.)
Mark 391.021 to 91.029 mm (3.5835 to 3.5838 in.)

3. Subtract the piston diameter measurement from the cylinder bore diameter measurement.
Standard oil clearance:
0.060 to 0.104 mm (0.0023 to 0.0041 in.)
Maximum oil clearance: 0.124 mm (0.0049 in.)
If the oil clearance is greater than the maximum, replace all the 8 pistons. If necessary, replace the
c
ylinder block sub-assy.

HINT:
Use a new cylinder block:
Use a piston with the same number mark as the cylinder diameter marked on the cylinder
block.
The shape of the piston varies for the LH and RH banks. The LH piston is marked with "3L"
and the RH piston is marked with "3R".

Fig. 443: Identifying Cylinder Block Diameter
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
c. Inspect the piston pin fit.

Fig. 446: Measuring Clearance Between Piston Ring Using Feeler Gauge
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
b. Inspect the piston ring end gap.
1. Insert the piston ring into the cylinder bore.
2. Using a piston, push the piston ring a little beyond the bottom of the ring travel 105 mm (4.13 in.)
from the top of the cylinder block.

MAXIMUM END GAP:
MAXIMUM END GAP SPECIFICATIONS
Fig. 448: Measuring Piston Ring Gap Using Feeler Gauge

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
If the end gap is greater than the maximum, replace the piston ring. If the end gap is greater than the
maximum, even with a new piston ring, replace the cylinder block sub-assy.
No. 10.300 to 0.500 mm (0.0118 to 0.0197 in.)
No. 20.400 to 0.600 mm (0.0157 to 0.0236 in.)
Oil (Side rail)0.150 to 0.500 mm (0.0059 to 0.0197 in.)
No. 11.05 mm (0.0413 in.)
No. 21.20 mm (0.0472 in.)
Oil (Side rail)1.10 mm (0.0433 in.)

Fig. 454: Measuring Tension Portion Diameter Of Main Bearing Cap Bolt Using Vernier Caliper
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
16.INSPECT CRANKSHAFT
a. Inspect for circle runout.
1. Place the crankshaft 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 crankshaft.