TM  10-3930-643-34 ENGINE,  FUEL,  EXHAUST  AND  COOLING 4-4. Cylinder  Head  Assembly  with DISASSEMBLY/CLEANING/INSPECTION NOTE TROUBLESHOOTING  AND  MAINTENANCE.  (cont) Valves. (Sheet 4 of 18) 7. 8. 9. Identify  valves  (exhaust  valves- small  head  or  intake  valves-large head)  and  their  locations. All valves are to be installed in the same location from which they were removed. Using a valve spring lifter tool, compress springs (11) and remove 24 keys (8), 12 rotors (9), shields (10), springs (11) and spring seats (12). Remove 12 rotors (9), shields (10), springs (11) and spring seats (12). Remove  six  exhaust  valves-small  head (13) and intake valves-large head (14) from bottom of cylinder head (6). NOTE If valve cannot be removed easily, inspect for burrs. If burr exists, remove with a hone  to prevent valve guide damage. Go to sheet 5 4-32