Parts Inspection And Measurement - Yanmar 3TNV Series Service Manual

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 0.02
(b) Intake/exhaust cam height measurement
Model Standard
3TNV82A 88 38.600 38.800
43.400 43.600
4TNV94L･98
4TNV106(T) 50.900 51.100
(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
the camshaft bushing inside diameter after
insertion to the cylinder measured with a cylinder
gage.
4. Disassembly, Inspection and Reassembly of Engines
mm
Limit
0.05
mm
Limit
38.350
43.150
50.650
87