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Fig. 380: Measuring Cam Lobe Height Using Micrometer
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
c. Inspect the journal diameter of the camshaft.
1. Using a micrometer, measure the journal diameter of the No. 3 camshaft for the
camshaft bearing.
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.
Page 3666 of 4500
Fig. 381: Measuring Journal Diameter Using Micrometer
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
2. Using a micrometer, measure the journal diameter for the camshaft timing tube.
Journal diameter: 30.984 to 31.000 mm (1.2198 to 1.2205 in.)
If the journal diameter is not as specified, check the oil clearance.
d. Inspect the journal diameter of the camshaft timing tube.
1. Using a micrometer, measure the journal diameter.
Journal diameter: 39.955 to 39.964 mm (1.5730 to 1.5734 in.)
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Fig. 382: Measuring Journal Diameter Using Micrometer (1 Of 2)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
If the
journal diameter is not as specified, check the oil clearance.
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Fig. 383: Measuring Journal Diameter Using Micrometer ( Of 2)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
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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
).
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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.)
Page 3671 of 4500
g. Completely remove the Plastigage.
h. Remove the camshaft.
i. Remove the camshaft timing tube from the No. 3 camshaft.
Fig. 386: Measuring Plastigage At Widest Point
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
k. Check the thrust clearance.
1. Install the camshaft timing tube to the No. 3 camshaft (see OVERHAUL
).
2. Install the No. 3 camshaft (see OVERHAUL
).
3. Using a dial indicator, measure the thrust clearance while moving the No. 3 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 No. 3 camshaft. If necessary,
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4. Remove the No. 3 camshaft.
5. Remove the camshaft timing tube from the No. 3 camshaft.
Fig. 387: Measuring Thrust Clearance Using Dial Indicator
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
l. Check the gear backlash.
1. Install the drive gear to the camshaft timing tube (see OVERHAUL
).
2. Install the camshaft timing tube to the No. 3 camshaft (see OVERHAUL
).
3. Install the No. 3 camshaft and No. 4 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.)
If the backlash is greater than the maximum, replace the drive gear and No. 4 camshaft.
m. Remove the No. 3 camshaft and No. 4 camshaft.
n. Remove the camshaft timin
g tube from the No. 3 camshaft.