Parts Inspection And Measurement - Takeuchi TB014 Werkstatt-Handbuch

4. Disassembly, inspection and reassembly of engines

4.3.5 Parts inspection and measurement

(1) Camshaft
Mainly check the contact between the tappet and cam
contact surface, bearing seizure and wear, and gear
damage.
(a)Shaft bend measurement
Support the camshaft with V blocks. Rotate the camshaft
and measure the distortion at the center of the camshaft
and at each journal with a dial gage. Half of the distortion
is the bend.
Item Standard
Bend 0 to 0.02
(b)Intake/exhaust cam height measurement
Model Standard
2/3TNV70 34.535 to 34.665
3TNV76 34.135 to 34.265
(c)Camshaft outside diameter and bearing hole diameter measurement Measure the camshaft
outside diameter with a micrometer. The oil clearance shall be calculated by subtracting the
measured camshaft outside diameter from the camshaft metal inside diameter after insertion to
the cylinder measured with a cylinder gage.
Place
Gear side
Intermediate position
Flywheel side
(R.1)
mm
Limit
0.05
mm
Limit
34.29
33.89
Item
Metal I.D. 40.000 to 40.075
Camshaft O.D. 39.940 to 39.960
Oil clearance 0.040 to 0.135
Metal I.D. 40.000 to 40.025
Camshaft O.D. 39.910 to 39.935
Oil clearance 0.065 to 0.115
Metal I.D. 40.000 to 40.025
Camshaft O.D. 39.940 to 39.960
Oil clearance 0.04 to 0.085
Cam height
Standard
71
Dial gage
V-block
Camshaft bend
Micrometer
Cam height
mm
Limit
40.150
39.905
0.245
40.100
39.875
0.225
40.100
39.905
0.195