LEXUS LS430 2003 Factory Repair Manual

Fig. 366: Measuring Journal Diameter Using Micrometer
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
d. Inspect the journal diameter of the camshaft timing tube.
1. Using a micrometer, measure the journal diameter.
<002d00520058005500510044004f00030047004c004400500048005700480055001d00030016001c0011001c0018001800030057005200030016001c0011001c001900170003005000500003000b001400110018001a001600130003005700520003001400
110018001a001600170003004c00510011000c[
If the
journal diameter is not as specified, check the oil clearance.

Fig. 367: Measuring Journal Diameter Using Micrometer
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
e. Install the camshaft timing tube to the camshaft, and check that the timing tube turns smoothly.
If necessar
y, replace the timing tube and camshaft.

Fig. 368: Installing Camshaft Timing Tube
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
f. Check the oil clearance.
1. Install the camshaft timing tube to the camshaft (see OVERHAUL
).
2. Clean the bearing caps and journals.
3. Check the bearings for flaking and scoring.
If the bearings are damaged, replace the bearing caps and cylinder head as a set.
4. Place the camshaft on the cylinder head.
5. Lay a strip of Plastigage across each of the journals.
6. Install the bearing caps (see OVERHAUL
).

Fig. 369: Identifying Plastigage
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
7. Remove the bearing caps.
8. Measure the Plastigage at its widest point.

Fig. 370: Measuring Plastigage At Widest Point
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
STANDARD OIL CLEARANCE:
OIL CLEARANCE SPECIFICATIONS
MAXIMUM OIL CLEARANCE:
MAXIMUM OIL CLEARANCE SPECIFICATIONS
If the oil clearance is greater than the maximum, replace the camshaft and timing tube. If
necessary, replace the bearing caps and cylinder head as a set.
9. Completely remove the Plastigage.
10. Remove the camshaft.
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.)

11. Remove the camshaft timing tube from the camshaft.
Fig. 371: Measuring Thrust Clearance Using Dial Indicator

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
g. Check the thrust clearance.
1. Install the camshaft timing tube to the camshaft (see OVERHAUL
).
2. Install the camshaft (see OVERHAUL
).
3. Using a dial indicator, measure the thrust clearance while moving the camshaft back and
forth.
Standard thrust clearance: 0.060 to 0.100 mm (0.0024 to 0.0039 in.) Maximum thrust
clearance: 0.13 mm (0.0051 in.)
If the thrust clearance is greater than the maximum, replace the camshaft. If necessary,
replace the bearing caps and cylinder head as a set.
4. Remove the camshaft.
5. Remove the camshaft timing tube from the camshaft.
h. Check the gear backlash.
1. Install the drive
gear to the camshaft timing tube (see OVERHAUL ).

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.

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. 2 camshaft.
Fig. 373: Measuring Circle Runout Center Journal Using Dial Indicator

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
b. Using a micrometer, measure the cam lobe height.
<0036005700440051004700440055004700030046004400500003004f0052004500480003004b0048004c004a004b0057001d00030017001500110019001600130003005700520003001700150011001a001600130003005000500003000b00140011001900
1a001b00160003005700520003001400110019001b00150016[ in.) Minimum cam
lobe height: 42.48 mm (1.6724 in.)
If the cam lobe height is less than the minimum, replace the No. 2 camshaft.

Fig. 374: Measuring Cam Lobe Height Using Micrometer
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
c. Using a micrometer, measure the journal diameter.
Journal diameter: 26.954 to 26.970 mm (1.0612 to 1.0618 in.)
If the journal diameter is not as specified, check the oil clearance.

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
).