TM 5-4320-300-146-9. VALVES, CAMSHAFT, AND TIMING GEARS (CONT)Location/ItemActionRemarksREPLACEMENT OFVALVE PARTS27. ValvesReplace any valves that show head warping,burning, or other damage. Replace valvesthat have seriously scratched or scuffed stems;or pitted, ridged, or cracked faces. Removeslight scratches or scuff marks with P-C-458crocus cloth.28. Valve guideReplace any valve guides that are fractured,chipped, scored, or show excessive wear. Re-place any guide with a guide-to-stem clearancegreater than 0.005 inch (0.1827 mm).29. Valve springs,Replace any valve springs that are pitted,locks, caps,fractured, excessively worn, or damaged. Re-and seatsplace locks, caps, and seats that are fractured,excessively worn, or damaged. Replace anyspring that can be compressed to 1.93 inches(49.02 mm) with a load less than 25 pounds(11.34 kg). Replace both valve springs if thedifference between any pair of valve springsexceeds 6 pounds (2.7 kg).30. Valve guideOil seals were removed and discarded duringoil sealsdisassembly. Replace with new oil seals priorto reassembly.31. Valve seatReplace any valve seat inserts that show ex-insertscessive wear, cracks, pitting, or improper valveseat angle (greater or less than 31 degrees).6-66
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