Page 3649 of 4500
Fig. 364: 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 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 3650 of 4500
Fig. 365: Measuring Journal Diameter Of Camshaft Using Micrometer
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
2. Using a micrometer, measure the journal diameter for the camshaft timing tube.
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1100150015001300180003004c00510011000c[
If the
journal diameter is not as specified, check the oil clearance.
Page 3651 of 4500
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.
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110018001a001600170003004c00510011000c[
If the
journal diameter is not as specified, check the oil clearance.
Page 3652 of 4500
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.
Page 3653 of 4500
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
).
Page 3654 of 4500
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.
Page 3655 of 4500
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.)
Page 3656 of 4500
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 ).