TM5-6115-593-34 NAVFAC P-8-631-34 TO-35C2-3-463-2 washer (5) and screw (4). (8)   Install  key  (29),  press  gear  (26)  and  coupling (25A)  into  position  on  drive  shaft  (27).    Press slow  and  straight.    Be  certain  tachometer  gear teeth are aligned. (9)   Install Washer (25), lockwasher (24), screw (23), and  spider  coupling  (22).    Hold  coupling  (25A) or  main  shaft  (27)  in  a  copperjawed  vise  while tightening. (10) Coat    governor    bushing    (15)    with    high- pressure   lubricant   and   press   governor   weight and    carrier    assembly    (16)    into    front    cover. Mesh  gears  to  avoid  gear  tooth  damage.    The bushing    must    seat    against    housing.    Rotate weight assembly, with weights opened out, to be sure  it  will  turn  completely  in  housing.    Install snap ring (14). (11) Install  mainshaft  cover  assembly  to  engine assembly with the four washers and capscrews. (12) Replace  the  fuel  pump,  speed  switch  and tachometer drive adapter. 13-9. TACHOMETER    DRIVE    CONNECTOR    (Code B).    To  replace  the  tachometer  drive  adapter, code B, proceed as follows: a. Remove  the  speed  switch  in  accordance  with the Operator/ Crew and Organizational Maintenance manual. b. Unscrew  the  connector  (7,  figure  13-13)  from the tachometer drive housing. c. Replace with a new connector if required. d. Replace  the  speed  switch  in  accordance  with the Operator/ Crew and Organizational. Maintenance manual. 13-10. TACHOMETER  DRIVE  (Code  B).    To  inspect, replace,  and  repair  the  tachometer  drive  refer  to  figure 13-13, and proceed as follows: a. Removal. (1)   Remove the speed switch and tachometer drive connector in accordance with paragraph 13-9. (2)   Remove the fuel pump. (3)   Remove   the   main   shaft   cover   assembly   by removing   the   four   cap   screws   and   washers securing it to the engine assembly. (4)   Check   the   governor   weight   carrier   shaft   (24, figure   13-21)   in   its   bushing   before   removal. Excessive   wear   can   be   felt   by   moving   shaft from side to side in the bushing. (5)   Observe   gear   backlash   between   weight   shaft gear and drive gear (22, figure 13-13).  Normal backlash  is  0.005  to  0.009  inch  (0.13  to  0.23 mm). (6)   Remove carrier (24, figure 13-21). (7)   Remove  drive  shaft  (9,  figure  13-13),  seal  (8), bushing (10), and gear (11). (8)   Remove    screw    (13),    hub    (14).key    (15), spacer (16) and gear (17).  Pres drive shaft (25) from cover. (9)   Press gear (22) from cover (10)   Press oil seals (19) from cover. b. Inspection. (1)   Visually  inspect  gears  for  cracked,  broken,  or worn teeth. (2)   Inspect all shafts for wear or scoring. c. Repair.  Repair by replacing damaged parts. d. Assembly. (1)   Clean all parts thoroughly with mineral spirits. 13-24