e.   Replace.   Using   screws   (13,   figure   7-2),   lock- washers  (14),  and  nuts  (15),  attach  governor  control bracket (12) to engine back plate. Attach speed control cable (11) to governor arm (3) with pin (6) and cotter pin (5). Attach governor arm (3) and governor linkage (1)  between  governor  and  fuel  injection  pump  (2).  If new  ball  joints  are  used  on  linkage,  position  the  new joints  to  obtain  the  same  length  or  1/32  inch  more  (1 turn  =  1/32  inch)  than  the  old  linkage.  If  old  linkage length  is  not  available,  position  new  ball  joints  about midway on each end linkage, then lengthen 1/8 inch. DO not   overspeed   engine   for moment. more  than  a f.   Preliminary   Linkage   Adjustment   (figure   7-3.1). The   following   adjustments   shall   be   made   before starting  the  engine  if  the  linkage  was  replaced. (1)  With  link  (1)  compressed,  adjust  length  be- tween  ball  joints  to  5-1/2  in. (2)  Set  solenoid  bumper  screw  to  shut  off  posi- tion, dotted line (2), by loosening locknut (3) on sole- noid  plunger  (4).  With  plunger  down,  adjust  bumper screw  to  push  control  unit  post  down,  dotted  line  (5), to maximum shutoff position. (3) Hook governor spring (6) in the mid-range of sensitivity  ratchet  (7). (4)  Manually  move  governor  arm  and  linkage  to check   for   interference. (5)   Adjust   position   of   upper   ball   joint   in   slot (8)  on  governor  arm  (9)  so  link  (1)  does  not  bind against  fuel  stop  solenoid  or  hole  (10).  A  slight  con- tact  of  link  to  bottom  of  solenoid  is  permissible  but only  at  shut  down.  The  fuel  control  unit  should  move up  to  position  (2A)  when  solenoid  is  energized  with start   switch. g.  Final  Linkage  Adjustment.  Perform  the  follow- ing  steps  to  establish  governor  overshoot  and  under- shoot,   balancing   external   linkage   movements   within the  range  of  governor  internal  parts. (1)  Start  engine  and,  with  no  load,  adjust  speed control  for  rated  frequency. (2)  Push  linkage  downward  (11)  about  1/4  in. with  light  finger  pressure.  If  the  linkage  appears  to reach  governor  internal  travel  limit  (higher  pressure is  felt),  stop  engine  and  lengthen  linkage  as  required. (3)   Apply   rated   load   and   adjust   speed   control for  rated  frequency. CAUTION Shortening the linkage too much in the follow- ing   step   will   prevent   no-load   speed   control, or  may  cause  a  runaway  engine. h.  Speed  Droop  Adjustment  (figure  7-3.1  ).  Droop between   no   load   and   rated   load   is   adjusted   by   ro- tating  ratchet  (7). Clockwise   rotation   decreases droop;   counterclockwise   rotation   increases   droop. Start  engine  and  with  no  load,  adjust  speed  control for   rated   frequency.   While   observing   the   set   fre- TM5-6115-585-34 NAVFAC P-8-623-34 TO-35C2-3-455-2 TM-05684C/05685B-34 quency meter, change from no load to full load several times. Adjust to minimum droop obtainable. Repeat as required. On ASK equipped gen- erators, refer to Operator and Organizational Maintenance Manual and replace right panel assembly. Figure  7-3.1.  Governor  Linkage  Adjustment NOT E If  droop  is  too  small,  hunting  (periodic  fre- quency swings) will occur when changing from no   load   to   full   range   because   the   governor will  be  too  sensitive. 7-4.  FLYWHEEL AND RING GEAR ASSEMBLY a. Removal (see figure 7-3). (1)  Remove  engine  from  set  per  paragraph  2-9. (2) Remove timing pointer (10, figure 7-3) by re- moving screws (11). (3)   The   flywheel   (1)   is   a   tapered   fit   on   the crankshaft  (2).  Remove  flywheel  mounting  screw  (3) and washer (4). Support and remove flywheel and ring gear  assembly  by  using  a  two  pronged  wheel  puller inserted  through  the  slots  provided  in  the  flywheel. b.  Clean  and  Inspect.  Clean  the  flywheel  and  ring gear  assembly  (1)  using  solvent.  Check  the  ring  gear for  broken  or  worn  teeth. c.  Install.  Replacement  flyheels  are  supplied  with timing  marks  already  stamped  in  place.  The  engine must  still  be  timed  properly  to  this  timing  mark.  The only  accurate  method  of  determining  the  port  closing point  is  to  measure  piston  travel.  This  is  a  critical measurement  and  should  be  done  only  with  accurate, dependable   equipment   Mount   flywheel   keying properly   and   tighten   in   place   using   screw   (3)   and washer  (4),  (figure  7-3).  With  the  flywheel  mounted, rotate   flywheel   counterclockwise   until   Number   1 cylinder  is  on  its  compression  stroke,  which  follows the  closing  of  its  intake  valve.  Remove  the  exhaust rocker  arm  (3,  figure  7-9),  exhaust  valve  rotator  (1, figure  7-11).  valve  looks  (2),  spring  retainer  (3)  and spring   (5),   using   fabricated   tool   (see   figure   7-10). Allow exhaust valve to drop down onto top of piston. Rotate   flywheel   counterclockwise   until   piston   is   at Change  6 7-5