NOTE After   each   droop   adjustment,   check   full- load   delivery   and   reposition   the   throttle lever   slightly   as   needed   to   compensate for  any  change  in  full-load  fuel  delivery. (d)  Disconnect  vernier  rack  positioner. Hold  throffle  lever  as  far  open  as  it  will  go  with high-   speed   adjusting   screw   backed   out.   Increase test  stand  speed  to  10  percent  above  full-load speed  (900  rpm). (e)  Turn  high  idle  adjusting  screw  in  (clock- wise)  until  fuel  delivery  is  20-25  percent  of  full-load quantity  (900-990  rpm). Lock  adjusting  screw  in  this position.   This   prevents   accidental   overspeeding   in the   event   that   speed   droop   needs   further   adjustment on  engine. Do  not  change  droop  setting. (f)   Seal   all   throttle   and   shut-off   lever   ad- justing   screws   with   lead   plomb. (g)  If  fuel  pump  is  to  be  used  for  400  Hz application,   reset  high  idle  speed  screw  to  1125  rpm. (17)   Speed   droop   adjustment   installed   on   engine (60 HZ application). (a)   after   priming   fuel   system,   start   and warm   engine   to   operating   temperature. (b)   with   full-load   applied   and   engine   opera- ting  at  rated  speed,  droop  may  be  determined  by  re- moving  load  and  noting  no-load  speed  or  frequency. (c)  Droop  may  be  adjusted  by  turning  knob clockwise   to   increase,   counterclockwise   to   decrease. A  minor  correction  of  throttle  position  will  also  be necessary. 14-49.  Fuel  Pump  Installation,  Fuel  Pump  and Engine   Timing. a.  Insure  that  the  number  1  piston  is  on  its  com- pression    stroke. This  can  be  determined  by  removal of  the  cylinder  head  cover  so  valve  action  can  be  ob- served. (1)  Bar  the  engine  over  by  hand  until  number  6 cylinder  exhaust  valve  is  nearly  closed  and  number  6 cylinder   intake   valve   is   just   beginning   to   open.   This will  position  number  1  cylinder  near  the  top  of  its compression    stroke. (2)  To  be  sure  that  all  slack  is  out  of  the  timing gears,  back  up  the  engine  (counter  clockwise)  past  the 24°  BTDC  timing  mark  and  again  come  up  to  the  tim- ing  mark  (24°  BTDC)  in  the  direction  of  normal  engine rotation  (clockwise  when  viewed  from  the  front)  (fig. 14-25,  View  A). NOTE During   assembly   of   the   engine   or   replacement of  any  of  the  timing  gears  it  is  necessary  to align  the  timing  marks  as  indicated  in  (fig. 14-25,  View  B). b.  Remove  timing  window  cover  from  the  fuel  in- jection   pump. With   a   clean,   wide   bladed   screwdriver or  the  pump  drive  shaft  inserted  into  the  drive  end  of the  pump  rotate  the  distributor  rotor  until  the  timing line  on  the  weight  retainer  hub  registers  with  the  line on  the  cam  as  indicated  in  (fig.  14-25,  View  C). c.   Install   drive   shaft   by   greasing   shaft   seals   with clean   grease. Do  not  roll  ‘seals  over  as  shaft  is  in- serted   into   pump. Slot  in  pump  end  of  shaft  should mate  with  tab  on  pump  rotor  pin. d.  Mount  fuel  pump  and  adapter  in  position  on engine  and  secure  pump  and  adapter  with  mounting bolt s. NOTE New   injectipn   pumps   received   from   supply have  a  high  idle  adjustment  of  1860  rpm  for 60   HZ   applications.   Installation   on   400   HZ generator    sets    requires    resetting    the    high speed  adjustment  screw  (12,  figure  14-24)  to 2250  rpm.   Adjustment   is   accomplished   using an   engine   speed   tachometer   with   actuater rod  (3,  figure  13-1)  disconnected,  the  shutoff lever,  (21,  figure  14-21)  in  the  on-fuel  condi- tion   then   manually   operating   the   throttle lever,  (32,  figure   14-21)   against   high   speed stop. e.  Connect  throttle  and  shut-off  linkage. f.   Connect   fuel   supply,   return,   nozzle   leak-off lines   and   High   pressure   lines. g.  Before  installing  fuel  pump  drive  gear,  inspect fuel  pump  drive  shaft  and  remove  any  burrs  if necessary. h.  Install  woodruff  key  and  coat  fuel  pump  drive shaft  with  engine  oil. i.  Position  fuel  pump  drive  gear  on  shaft  so  keyway in gear lines Up with the woodruff key. j.   Install   nut   and   lockwasher   to   secure   drive gear  and  tighten  to  torque  of  35  to  40  foot-pounds. k.   Replace   thrust   button   and   spring   on   drive shaft. J.   Replace   timing   gear   inspection   cover. 14-50.   Equipment   Test. If  the  fuel  injection  pump  has  been  repaired  or  re- placed  refer  to  Chapter  16,  Section   II and   conduct the   following   equipment   tests. 14-56  Change  6