Cub Cadet Yanmar 3TNV72 - Manual (Page 134)

ENGINE
TNV IDI Service Manual 6-35
Cylinder Head
Figure 6-35
4. If adjustment is required, proceed to the next
step.
5. Loosen the valve adjusting screw lock nut
(Figure 6-36, (1)) and valve adjusting screw
(Figure 6-36, (2)) on the rocker arm. Check the
valve for inclination of the valve cap, entrance of
dirt, or wear.
Figure 6-36
6. Insert a feeler gauge of the correct thickness
(Figure 6-37, (1)) between rocker arm and
valve cap. Turn the valve adjustment screw to
adjust the valve clearance so there is a slight
“drag” on the feeler gauge when sliding it
between the rocker arm and valve cap. Hold the
adjusting screw while tightening the valve
adjusting screw lock nut (Figure 6-36, (1)).
Recheck the clearance (see Adjustment
Specifications on page 6-5).
Note: There is a tendency for the clearance to
decrease slightly when the lock nut is
tightened. It is suggested that the initial
clearance adjustment be made slightly
on the “loose” side before tightening the
lock nut.
Figure 6-37
7. Apply oil to the contact surface between
adjusting screw and push rod.
8. Rotate the crankshaft and measure the next
cylinder. Continue until all valves are adjusted.
(1)
0001782A
0001783A
(1)
(2)
(1)
0001782A
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