Figure 5-40. Valve Face and Seat Angles F10000RG-2

TM5-4110-234-14

TO 40R7-5-7-1

(6) Remove all grinding compound from engine parts and place each valve in its proper location. Check each

valve for a tight seat, using an air pressure type testing tool. If such a tool is not available, make pencil marks at intervals

across the valve face and observe if the marks rub off uniformly when the valve is rotated part of a turn against the seat.

(7) Lightly oil the valve stems and reassemble all parts removed. Adjust the valve clearance. Refer to the tappet

adjustment procedure in subparagraph c.

(8) The positive type valve rotocoils serve to prolong valve life and decrease valve repairs. Check the rotocoils

periodically by removing the cylinder heads and cranking the engine. When functioning properly, the valve is rotated a

fraction of a turn each time it opens. If rotocoils are faulty, install new ones.

Tappet Adjustment. See figure 5-41.

Figure 5-41. Adjusting Tappets F10000RG-2

5-56