ARMY TM 9-6115-673-13&P
AIR FORCE TO 35C2-3-512-1
(2) Measure valve seat angle and width (Figure 5-8). If out of limits, replace cylinder head.
(3) Using a micrometer, measure outside diameter of valve stems:
(a) Intake valve - 0.2126 - 0.2156 in. (5.40 - 5.475 mm).
(b) Exhaust valve - 0.2126 - 0.2150 in. (5.40 - 5.460 mm).
(c) Replace valves if out of limits.
(4) Using a micrometer, measure inside diameter of valve guides [0.2165 - 0.2197 in. (5.50 -5.58
mm)]. If out of limits, replace cylinder head.
(5) Measure valve sinkage [0.012 - 0.043 in. (0.3 -1.1 mm)] (Figure 5-9). Replace valves if out of
limits.
(6) Measure springs:
(a) Free length - 1.043 - 1.102 in. (26.5 - 28 mm).
(b) Inclination (distance spring inclines left or right) - 0.030 in. (0.75 mm).
(c) Spring tension (using a spring tester) - 2.51-3.09 lbs/in. (1.14-1.4 kg/mm).
(d) Replace defective springs.
c. Installation.
(1) Install new intake valve stem seal (Figure 5-7) in cylinder head.
(2) Apply lubricating oil (Item 14, Appendix E) to valve stem and insert intake valve into cylinder
head.
