Yanmar BY Series Service Manual page 150

Repair
Figure 6-22
10. Hold crankshaft to prevent turning and remove
nut (Figure 6-22, (1)).
Figure 6-23
11. Thread special tool OEM No. 13 5 192 into
timing case cover (Figure 6-23).
BY Service Manual
Figure 6-24
12. Thread special tool OEM No. 13 5 191 without
jack screw (Figure 6-24, (1)) into sprocket by
hand until firmly seated.
13. Thread jack screw (Figure 6-24, (1)) into
special tool until firmly in contact with end of
pump shaft.
Figure 6-25
14. Remove three nuts (Figure 6-25, (1)).
FUEL SYSTEM
6-21