TM 10-3930-669-34 b. Installation. (1)   Apply a light  coat  of  grease  to  intermediate  ring (14) and position on cylinder head (6). (2)   Position cylinder head (6) on cylinder (19). (3)   Apply a light coat of oil to threads of four screws (12)   and   install   screws   and   washers   (13)   in cylinder head (6).  Preload four screws to 30 lb-ft (40 N•m).  Tighten screws (see Appendix D). (4)   Install  two  preformed  packings  (11)  and  plugs (10) in cylinder head (6).  Tighten plugs to 59 to 66 lb-ft (80-90 N•m). 3-39