ARMY TM 9-2805-257-14 AIR  FORCE  TO  38G2-103-2 NAVY NAVFAC P-8-612-14E 5-14. b. (1) (2) (3) (4) (5) (6) (7) (8) (9) (10) (11) (12) (13) (14) 5-28 Cylinder Head (cont). Repair. (figure 5-12) NOTE The repair procedures are the same for both cylinder heads. WARNING Dry  cleaning  solvent  PD-680  used  to  clean  parts  is  potentially  dangerous  to  personnel and property. Avoid repeated and prolonged skin contact. Do not use near open flame or excessive heat. Flash point of solvent is 100°F -138°F (38°C-60°C). Clean  cylinder  head  assembly  with  dry  cleaning  solvent  and  dry  thoroughly. Remove clip (1) and remove rocker shaft (2). Remove two rocker arms (3) and take note of which rocker is for intake and exhaust. Remove  two  push  rod  packing  screws  (4)  and  preformed  packing  (5). Using  a  valve  spring  compressor,  remove  two  retainer  halves  (6),  rotocap  (7)  intake  valve  (8)  and spring  (9). Repeat step (5) for exhaust valve. Inspect all components of cylinder head assembly. Replace any component of cylinder head assembly which shows signs of excessive wear or other damaged. Refer to Table 5-2 for wear limits. Re-seat valves in cylinder head to ensure proper seal. Install intake valve (8), spring (9), and rotorcap (7). Use valve spring compressor and install two retaining halves (6). Repeat steps (9) and (10) for exhaust valve. Install two preformed packings (5) and push rod packing screws (4). Install both rocker arms (3), rocker shaft (2) and clip (1). Loosen two lock nuts (10) and unscrew adjusters (11) part way.