FIGURE 4-21. Clean Off Lapping Compound.

TM 55-1905-223-24-4

(9) Remove the valves and clean lapping compound from the valves and seats.

(10) Measure the valve seat width indicated by the lapped surface.

Valve Seat Width Limit

Minimum (1): 1.5mm (0.060 inch)

Maximum (2): 2.0mm (0.080 inch)

FIGURE 4-22. Valve Seat Width Measurement.

(11) If required, grind area (A) with a 60 degree stone and (B) with a 15 degree stone to center the seat on the

valve face. (FIGURE 4-23). Maintain the valve seat width limits.

Limits

Minimum (1):

1.5mm (0.060 inch)

Maximum (2):

2.0mm (0.080 inch)

4-20