Doosan DX60R Shop Manual page 306

8. To adjust the actual valve clearance between the rocker
arm and the valve bridge, insert a feeler gauge (1, Figure
165) of the correct
Specifications" on page -95) between the rocker arm (2,
Figure 165) and valve bridge (3, Figure 165). Record the
results and use this value as an indication of wear.
9. If adjustment is required, proceed to the next step.
10. Loosen the valve adjusting screw lock nut (5, Figure 166)
and valve adjusting screw (4, Figure 166) on the rocker
arm (3, Figure 166) and check the clearance gap (2,
Figure 166) for evidence of dirt or wear.
NOTE:
There is a tendency for the clearance to
decrease slightly when the lock nut is tightened.
It is suggested that you make the clearance
adjustment is made slightly on the "loose" side
before tightening the lock nut.
11. Adjust the valve clearance (2, Figure 166) by turning the
adjusting screw (4, Figure 166) until there is a slight "drag"
on the feeler gauge when sliding it between the rocker
arm and the valve bridge.
12. Hold the adjusting screw (4, Figure 166) while tightening
the valve adjusting screw lock nut (5, Figure 166).
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.
Engine
Page 126
thickness (See "Adjustment
Figure 165
Figure 166
SP001693