2003 LEXUS LS430 lock

block and the manifolds for warpage.
MAXIMUM WARPAGE:
CYLINDER BLOCK CONTACTING SURFACE SPECIFICATIONS
If the warpage is greater than the maximum, replace the cylinder head.
Fig. 321: Inspecting Cylinder Head For Cracks

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
c. Inspect the cylinder head for cracks.
1. Using a dye penetrant, check the combustion chamber, intake ports, exhaust ports and cylinder
block surface for cracks.
If cracked, replace the c
ylinder head.
ItemSpecified Condition
Cylinder block surface0.05 mm (0.0020 in.)
Intake manifold surface0.10 mm (0.0039 in.)
Exhaust manifold surface0.10 mm (0.0039 in.)

Fig. 362: Measuring Lifter Bore Diameter Of Cylinder Head Using Caliper Gauge
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
18.INSPECT CAMSHAFT
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 camshaft.

2. Install the camshaft timing tube to the camshaft (see OVERHAUL ).
3. Install the camshaft and No. 2 camshaft without installing the camshaft sub-gear and front
bearing cap (see OVERHAUL
).
4. Using a dial indicator, measure the backlash.
Standard backlash: 0.020 to 0.200 mm (0.0008 to 0.0079 in.)
Maximum backlash: 0.30 mm (0.0188 in.)
Fig. 372: Measuring Backlash Using Dial Indicator

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
If the backlash is greater than the maximum, replace the drive gear and No. 2 camshaft.
a. Remove the camshaft and No. 2 camshaft.
b. Remove the camshaft timing tube from the camshaft.
c. Remove the drive gear from the camshaft timing tube.
i.INSPECT NO.2 CAMSHAFT
a. Inspect the circle runout.
1. Place the camshaft on V-
blocks.

Fig. 378: Measuring Thrust Clearance Using Dial Indicator
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
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.

o. Remove the drive gear from the camshaft timing tube.
Fig. 388: Measuring Gear Backlash Using Dial Indicator

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
19.INSPECT NO.4 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. 4 camshaft.

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

Fig. 397: Taping Spark Tube Using Wooden Block And Hammer
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
22.INSTALL TIGHT PLUG NO.1
a. Apply adhesive to the end of the spark plug tube.
Adhesive: Part No. 08833-00070, THREE BOND 1324 or equivalent
b. Using SST and a hammer, tap in a new tight plug as shown in the illustration.
SST 09950-60010 (09951-00200), 09950-70010 (09951-07100)

Fig. 407: Exploded View Of Cylinder Block Assy Components
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
OVERHAUL
HINT: