TM  5-6115-584-34 NAVFAC  P-8-622-34 TO-35C2-3-456-2 TM-0568C-34 Table  7-1.  Button  Code  Letter  and  Size Code No. Or Letter 16 15 14 13 12 1 2 3 4 5 S R P N M A B c D E Part  No. 147A186 147A187 147A188 147A189 147A190 147A147 147A148 147A149 147A150 147A151 Size 0.134 0.131 0.128 0.125 0.122 0.119 0.116 0.113 0.110 0.107 (b)  Remove  delivery  valve  cap  nut  and  delivery valve  holder  (figure  7-43).  A  12  point  socket  or  box wrench  must  be  used  on  delivery  valve  holder  to  keep from  damaging  this  part.  Lift  out  delivery  valve  spring only,  and  leave  it  out,  replacing  delivery  valve  holder, and  delivery  valve  cap  nut  and  gasket. (c)  Turn  blower  wheel  clockwise  until  Number l  cylinder  (closest  to  blower  wheel)is  on  compression stroke,  which  follows  closing  of  intake  valve. (d)  Set  throttle  lever  on  injection  pump  to  wide open  or  up  position  (compress  stop  solenoid  plunger spring   or   remove   stop   solenoid   assembly).   Connect Number  1  cylinder  fuel  line  to  Number  l  pump  outlet so  that  fuel  line  projects  from  the  engine,  hanging down.  Position  receptacle  for  fuel  under  the  line.  Con- nect  lines  from  fuel  supply  to  transfer  pumps,  trans- fer   pumps   to   filter,   and   filter   to   injection   pump, operate  fuel  transfer  pumps  to  obtain  fuel  pressure at  injection  pump.  This  can  be  done  on  the  unit  by turning  master  switch  to  PRIME  &  RUN,  or  just  by applying   24   volts   dc   across   the   transfer   pump.   Ro- tate  blower  wheel  about  one  inch  counterclockwise  so that  P.C.  mark  is  below  timing  pointer  hole. (e)   Rotate   blower   wheel   clockwise   until   fuel flows   from   Number   1   cylinder   fuel   line.   Continue rotating  slowly  clockwise  until  fuel  stops  flowing.  The point  at  which  fuel  stops  flowing  from  Number  1  cyl- inder   fuel   delivery   line   is   the   injection   pump   port closing   point.   Stop   rotation   of   engine   at   exactly   the port  closing  point  (1-  2  drops  in  5-10  seconds). (f)  Check  timing  pointer  in  the  timing  port  on the   side   of   the   generator   adapter   (figure   7-44).   If Figure  7-44.  Timing  Port  and  Port  Closing  Mark timing  pointer  coincides  with  the  P.C.  mark  stamped on   flywheel,   the   injection   pump   button   thickness   is correct.  If  the  P.C.  mark-on  flywheel  is  below  the pointer,  injection  pump  is  closing  early,  and  will  re- quire  a  thinner  button.  If  the  P.C.  mark  on  flywheel is   above   the   pointer,   injection   pump   is   closing   late and  will  require  a  thicker  button.  Each  mark  on  fly- wheel   indicates   a   difference   of   0.006   inch   button thickness  or  2  steps  in  button  code  number.  (Example: The   P.C.   mark   on   flywheel   is   above   pointer.   The pointer   indicates   1-1/2   marks   difference.   A   button 0.009   inch   thicker   or   3   steps   difference   in   button number  code  is  indicated.  Since  a  Number  12  or  M button  is  installed,  a  letter  R  button  is  needed.  ) (g)   Remove   injection   pump   and   insert   proper timing  button,  taking  the  same  precautions  not  to  lift the  assembly  containing  face  gear,  when  removing timing  button. (h)  Repeat  injection  pump  installation. (i)   Check   injection   port   closing   point   by   re- peating   steps   three   through   six.   The   timing   pointer should  indicate  the  P.C.  mark  on  flywheel.  In  no  case should  pointer  be  more  than  1/2  mark  away  from  the P.C.   mark. (j)  Install  delivery  valve  components.  Be  sure all   parts   are   clean,   and   assembled   carefully   and 7-40