TM 10-4320-226-146.6.2 Cylinder Head Repair.This task covers:6.6.2.1 Disassembly6.6.2.3 Assembly6.6.2.2 RepairINITIALSETUPToolsGeneral Mechanic’s Tool Kit (appendix B,Section III, Item 1)Drill (appendix B, Section III, Item 3)Micrometer (appendix B, Section III,Item 3)Valve Spring Compressor (appendix B,Section III, Item 15)Cutting Device (appendix B, Section III,Item 16)Reemer(appendix B, Section III, Item 17)Mandrel (Intake) (appendix B, Section III,Item 18)Mandrel (Exhaust) (appendix B, Section III,Item 19Mandrel (appendix B, Section III, Item, 20)Cutter (appendix B, Section III, Item, 21)Pilot Pin (appendix B, Section III,Item 22)Material/PartsValve seats (TM 10-4320-226-24P)EquipmentConditionsEngine disassembled, paragraph 6.6.4.GeneralSafety InstructionsDo not touch cylinder head while it ishot without protective gloves.DO not work on equipment withoutfollowing standard shop safetyprecautions.6.6.2.1 Disassembly.a.b.c.d.e.Install cylinder head (figure 6-2, 1) in clamping stand.Using valve spring compressor, disassemble as follows:(1) Remove two tapered valve spring keepers (2).(2) Remove two spring caps (3).(3) Remove two springs (4).Remove one valve rotor or spring seat(5).Remove valves (6 and 7) from cylinder head (1).Remove two locating rings (8) and valve6.6.2.2 Repair.a.Inspect cylinder head parts for obviousguides (9).defects.Replace defective parts.b.Using a micrometer measure valve springs (4) length.Minimum length is 2.204inch (56 mm).Replace if less than minimum length.c.Inspect valves (6) and (7) for cracks and pits.Replace valves if requiredand inspect to the tolerances specified in table 6-1.d.Inspect cylinder head (1) for external damage.Replace if damaged.6-11
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