TM 9-2320-260-34-1
3-51. CYLINDER HEAD REPAIR (Contd)
42.
Inspect eight valve guides (7) for chips, cracks, burrs, or broken out sections. Mark valve guides (7)
for replacement if chipped, cracked, burred, or broken.
43.
Measure protrusion height (9) of valve guide(s) (7). Mark valve guide(s) (7) for replacement if
protrusion height (9) is not 1.270-1.280 in. (32.26-32.51 mm) above cylinder head surface (10).
44.
Attempt to insert small bore gage, set at 0.4552 in. (11.562 mm), into valve guide bore (8). Mark
valve guide(s) (7) for replacement if bore gage goes into bore.
45.
Inspect valve head (15) on valves (13) for cracks, warpage, pits, burns, or cupping. Replace
valve(s) (13) if cracked, warped, pitted, burned, or cupped.
46.
Measure rim (14) thickness on valves (13). Replace valve(s) (13) if rim (14) thickness is less than
0.105 in. (2.67 mm).
47.
Using new keeper (16), inspect grooves (12) for wear. Replace valve(s) (13) if new keepers (16) fit
loosely in grooves (12).
48.
Inspect valve (13) stem for cracks, scoring, and galling. Replace valve(s) (13) if stem is cracked,
scored, or galled.
49.
Measure outside diameter (11) on valve (13) stem. Replace valve(s) (13) if stem outside
diameter (11) is less than 0.449 in. (11.40 mm).
3-161
