TM 5-4320-302-146-9. VALVE, VALVE GUIDES, AND VALVE SEATS (CONT)Location/ItemActionRemarks6.Cylinder headHeat cylinder head to 428°F (220C) in furnace.7.Valve guidesPress out old guides with valve guide mandrel,8 mm, No. 123310.REPAIR8.ValvesReplace any valves that show head warping, burn-ing, or other damage. Replace valves that haveseriously scratched or scuffed stems; or pitted,ridged, or cracked tulips, faces, or heads. Replacevalves that have a valve joint face thickness lessthan 0.0197 inch (0.5 mm) for inlet or exhaustvalve. Remove slight scratches or scuff marks withP-C-458 crocus cloth.9.CompressionReplace compression springs that are pitted,springs, valvefractured, excessively worn, or damaged. Replacecones, caps,any compression spring that has an unloadedvalve rotators,fatigue length of less than 2.2047 inches (56 mm).and snap ringsReplace both compression springs if necessary. Re-place valve cones, caps, and rotators that arefractured, excessively worn, or damaged. Replacesnap rings.6-54
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