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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.
Page 3658 of 4500
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.
Page 3659 of 4500
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.
Page 3660 of 4500
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
).
Page 3661 of 4500
Fig. 376: Checking Oil Clearance
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:
0.030 to 0.067 mm (0.0012 to 0.0026 in.)
Maximum oil clearance: 0.100 mm (0.0039 in.)
If the oil clearance is greater than the maximum, replace the No. 2 camshaft. If
necessary, replace the bearing caps and cylinder head as a set.
8. Completely remove the Plastigage.
9. Remove the No. 2 camshaft.
Page 3662 of 4500
Fig. 377: Measuring Plastigage At Widest Point
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
e. Check the thrust clearance.
1. Install the camshaft (see OVERHAUL
).
2. Using a dial indicator, measure the thrust clearance while moving the camshaft back and
forth.
Standard thrust clearance:
0.030 to 0.075 mm (0.0012 to 0.0030 in.)
Maximum thrust clearance: 0.12 mm (0.0047 in.)
If the thrust clearance is greater than the maximum, replace the No. 2 camshaft. If necessary,
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570011[
Page 3663 of 4500
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.
Page 3664 of 4500
Fig. 379: 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.
<0036005700440051004700440055004700030046004400500003004f0052004500480003004b0048004c004a004b0057001d00030017001500110019001400130003005700520003001700150011001a001400130003005000500003000b00140011001900
1a001a00190003005700520003001400110019001b00140018[ in.) Minimum cam
lobe height: 42.46 mm (1.6717 in.)
If the cam lobe height is less than the minimum, replace the No. 3 camshaft.