Yanmar 4TNV98 Service Manual page 110

Figure 6-83
12. Hold the adjusting screw (Figure 6-83, (4)) while
tightening the valve adjusting screw lock nut
(Figure 6-83, (5)). Recheck the clearance.
13. Apply oil to the contact surface between the
adjusting screw and push rod.
14. Rotate the crankshaft to measure and adjust the
set of valves. Continue until all valves are
measured and adjusted.
4TNV98 & 4TNE98 Diesel Engine 108 Section 3. Engine