Yanmar 2TNV70 - Page 136

ENGINE
6-50
TNV IDI Service Manual
Cylinder Block
Figure 6-76
Inspection of Camshaft
1. Use V-blocks and a dial indicator to check
camshaft bend (Figure 6-77). Place the
indicator on the center bearing journal.
Figure 6-77
2. Rotate the camshaft and observe the runout.
Record the measurements. See Camshaft on
page 6-6 for specifications.
3. Measure the height of each lobe
(Figure 6-78, (1)). Record the measurements.
See Camshaft on page 6-6 for specifications.
Figure 6-78
4. Measure the diameter of the gear end
(Figure 6-79, (1)), intermediate
(Figure 6-79, (2)), and flywheel end
(Figure 6-79, (3)) bearing journals. Record the
measurements. See Camshaft on page 6-6 for
specifications.
Figure 6-79
Item Finishing Precision
Connecting Rod Journal
Undersize Finished Size
1.6418 - 1.6422 in.
(41.702 - 41.712 mm)
Main Bearing Journal
Undersize Finished Size
1.8387 - 1.8391 in.
(46.702 - 46.712 mm)
Journal Radius (R)
0.138 - 0.150 in.
(3.5 - 3.8 mm)
Journal Face Finish (Ry) 0.8S (Super Polish)
Thrust Face Finish (1) 1.6
Ry
Ry
R
R
(1)
R
0000234A
0002196
(1)
0001712A
0001713A
(3)
(2)
(1)
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