Cub-cadet Yanmar 3TNV72 User Manual download pdf (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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Cub-cadet Yanmar 3TNV72 User Manual Page 134