Yanmar 3TNV82A Service Manual page 190

ENGINE
7. Tighten the lock nut (Figure 6-80, (1)), while
holding the valve bridge (Figure 6-80, (3)) with
a wrench (Figure 6-80, (2)). Verify that the
valve clearance (Figure 6-81, (2) is zero "0".
(3)
Figure 6-80
(1)
(2)
Figure 6-81
Note: There is a tendency for the clearance to
decrease slightly when the lock nut is
tightened. It is suggested that you make
the initial clearance adjustment is made
slightly on the "loose" side before
tightening the lock nut.
8. To adjust the actual valve clearance between
the rocker arm and the valve bridge, insert a
feeler gauge (Figure 6-82, (1)) of the correct
thickness (See Adjustment Specifications on
page 6-6) between the rocker arm
(Figure 6-82, (2)) and valve bridge
(Figure 6-82, (3)). Record the results and use
this value as an indication of wear.
6-64
(1)
(2)
0001917A
0001918D
Measuring and Adjusting Valve Clearance
Figure 6-82
9. If adjustment is required, proceed to the next
step.
10. Loosen the valve adjusting screw lock nut
(Figure 6-83, (5)) and valve adjusting screw
(Figure 6-83, (4)) on the rocker arm
(Figure 6-83, (3)) and check the clearance gap
(Figure 6-83, (2)) 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 (Figure 6-83, (2)) by
turning the adjusting screw (Figure 6-83, (4))
until there is a slight "drag" on the feeler gauge
when sliding it between the rocker arm and the
valve bridge.
TNV DI Service Manual
(2)
(1)
0003566
(3)