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TM 9-2815-226-34-1
i. Valve inspection.
(1) Clean valves with buffer and polish with crocus cloth.
(2) Mark valve for replacement if:
(a) Head is cupped, obviously cracked, or pitted.
(b) Rim worn too thin to regrind. Minimum rim thickness is 0.105 in. (2.67 mm).
(c) Stem scored or diameter worn to less than 0.449 in. (11.04 mm).
(d) Collet recesses worn so new collets will not fit securely in recesses.


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