Parts Inspection And Measurement - Takeuchi TB 175 Handbuch

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 runout at the center of the camshaft
and at each journal with a dial gage. Half of the runout is
the bend.
Item Standard
Bend 0 to 0.02
Intake/exhaust cam height measurement
(b)
Model Standard
3TNV82A to 88 38.600 to 38.800
4TNV94L•98 43.400 to 43.600
4TNV106 (T) 50.900 to 51.100
Camshaft and bearing hole measurement
(c)
Measure the camshaft outside diameter with a
micrometer. The oil clearance shall be calculated by
subtracting the measured camshaft outside diameter
from the inside diameter of the camshaft bearing or
bushing. The camshaft bushing at gear case side is
measured with a cylinder gage after insertion to the
cylinder.
4. Disassembly, inspection and reassembly of engines
mm
Limit
0.05
Water leak check in cooling water system
mm
Limit
38.350
43.150
50.650
87
Cap tester
Flywheel side
Micrometer
Camshaft outside diameter