TM   5-6115-585-34 NAVFAC   P-8-623-34 TO-35C2-3-455-2 TM-05684C/04685B-34 NOTE A  fuel  inlet  stud  can  be  fabricated  with  a  1/4” .18 NPT pipe die. High pressure tubing must be used  between  the  Nozzle  Test  Stand  and  the pump assembly. NOTE Always  check  to  make  sure  that  all  external connections  are  tight  and  that  the  Nozzle  Test Stand is in good order. (8)   Slowly   operate   the   Nozzle   Test   Stand   until   a pressure of 400 psi is achieved. A rapid drop in pressure in- dicates  that  a  leak  is  present.  The  pressure  must  remain above 250 psi for at least 30 seconds. DO NOT EXCEED A PRESSURE OF 400 PSI. (9)  Visual  inspection  should  be  as  follows: (a) Check for leakage by the head locating screw (13, figure 7-34). (b)  Slight  leakage  by  control  unit  shaft is  normal  and  is  necssary  to  lubricate shaft. Fuel leakage between the control unit body (4) and pump housing (6) indicates that either the o-ring (33) is damaged or the mating surfaces are damaged.   Replace the  o-ring  (33)  and  retest  the pump. If  fuel  leakage  is  eXCeSSive  (Class  III, see  TM 5^-6115-585-12, Section 111, Preventative Maintenance Checks and Services (PMCS)  at control unit shaft or continues past o-ring (33) replace defective  parts. (c)  Check  for  leakage  of  fuel  around  the  face  gear (28).  If  leakage  is  evident,  disassemble  pump  and  inspect “O”  ring  (19). (d)  Check  for  fuel  leakage  between  top  of  housing and  head  flange.  To  correct,  disassemble  and  replace  upper hydraulic  head  “O”  ring  (18). f.  Install  (Method  1). (1)  Turn  engine  flywheel  to  the  port  closing  mark (PC)  on  the  front  cylinder  (closest  to  blower  wheel)  com- pression stroke (see figure 7-44). (2)   Remove   timing   hole   screw   located   on   pump mounting  flange  (figure  7-42).  Insert  a  1/8  inch  diameter wire into the hole. (3)  Rotate  pump  face  gear  until  wire  slips  into  place locking the gear in position. (4)  Mount  pump  on  crankcase  (see  figure  7-32)  (be sure shims (5) are in place) and secure in position using four hexagon,  nuts  (2),  flatwashers  (4)  and  lockwashers  (3).  If “O” ring seal between pump and crankcase is worn, cracked or otherwise defective, replace it. (5)   Remove   wire.   Install   timing   hole   screw   and copper gasket. Figure  7-42.  Injection  Pump  Installation g.  Install  (Alternate  Method  2). (1)  If  pump  was  not  timed  by  method  1,  time  now using alternate method 2 below. (2)   Connect   flexible   fuel   inlet   line   to   pump   inlet. Connect fuel return line. (3)  Connect  each  fuel  outlet  line  to  the  proper  pump outlet (see paragraph 7-2). (4)   Connect   governor   linkage   to   governor   arm. (5)  Start  and  run  engine.  Adjust  governor  linkage  if required (see paragraph 7-3). A  maximum  throttle  stop  screw,  located  on  the injection  pump  control  assembly,  limits  the maximum amount of fuel which can be injected into  the  engine.  This  screw  should  not  be  tam- pered with; it has been properly adjusted at the factory  to  protect  the  engine  from  over-fueling (see figure 7-22). h.  Adjust/Time  on  Equipment. (1)  Time  the  injection  pump  to  the  engine  by  using the  proper  thickness  timing  button  between  pump  plunger and tappet (ace figure 7-3 3). Use method 1 when replacing an  old  pump  if  the  port  closing  dimensions  and  bottom number  of  the  old  pump  were  recorded.  Use  method   2 if the  dimensions  are  lost,  and  old  pump  is  being  timed,  or when replacing either the camshaft or crankshaft: 7-38 Change 5