TM5-6115-585-34 NAVFAC P-8-623-34 TO-35C2-3-455-2 TM-05684C/05685B-34 CHAPTER 7 MAINTENANCE  OF  ENGINE Section L DESCRIPTION AND FUNCTION 7-1.  GENERAL. One  piece,  press  fit  oil  seals  are  used  to  seal  both ends   of   crankshaft.   A   mechanical   governor   is   used The   engine   is   a   four   cylinder,   air-cooled,   overhead to   regulate   engine   speed   under   varying   generator valve,  fuel  injected,  diesel.  End  crankshaft  and  cam- load   conditions.   Since   the   engine   is   direct   coupled shaft  bearings  are  press  fit  one  piece  bearings.  The to   the   generator,   correct   engine   speed   will   produce center   crankshaft   bearing   is   a   two   piece   split   bear- required   generator   output. ing.  Crankshaft  end  play  is  adjusted  by  using  correct shim  between  rear  bearing  plate  and  cylinder  block. Section II. ENGINE EXTERNAL ASSEMBLY 7-2. FUEL LINES. a. Removal. On ASK equipped generators, refer to Operator and Organizational  Maintenance  Manual  and  remove  right  panel  assembly. Tag and remove injector nozzle return line (3, figure 7-1). Remove manifold (4) and return line (5). Tag and remove injector lines (7). b.  Inspection.  Inspect  lines  and  fittings  for  thread damage and breaks which might cause leaks. c.  Installation.  Remove  plugs  or  tape  from  lines  and  fittings. Contaminated  lines  and  fittings  should  be  rinsed  with  clean  fuel  oil before installation. Install injector lines (7, figure 7-1) between injector pump (1) and injector nozzles (2). Remove tags. Install return line (5) and manifold (4). Install fittings (6) on injector nozzles (2) and install return  lines  (3)  between  fittings  (6)  and  manifold  (4).  Remove  tags. For torque information on fuel line fittings see Table 9-1 . On ASK equipped  generators,  refer  to  Operator  and  Organizational  Mainten- ance Manual and replace right panel assembly. CONTROL   ASSEMBLY. a. Inspect (see figure 7-2). On ASK equipped generators, refer to Operator  and  Organizational  Maintenance  Manual  and  remove  right panel  assembly.  Inspect  governor  linkage  and  springs  for  physical damage, binding or excessive slack or wear. Check that linkage is clean and free of dirt, grease, or oil or other obstructions. Check that governor linkage moves freely. Check ball joints for smooth but not loose  fits. b.  Test.  Operate   engine   until   it   reaches   normal operating temperature.  Check  frequency  meter. Frequency   meter   should   indicate   rated   frequency with   no   load.   Apply   full   load   to   unit.   Governor should adjust engine speed to equal rated frequency without hunting (alternate increasing and decreasing of  speed).  Adjust  engine  sensitivity  if  necessary  as given below. C.  Adjust. (1)  Low  Speed  Adjustment.  Adjust  low  speed (1600  RPM  MEP-003A  or  1778  RPM  MEP-112A)  by repositioning   the   control   nut   (7,   figure   7-2)   at   the attaching  bracket  located  inside  the  engine  access door.  The  control  knob  should  be  pushed  fully  in  be- fore  making  the  low  speed  adjustment.  This  reduces tension   on   the   spring   (17)   permitting   governor   arm (3)  to  move  the  injector  pump  (2)  to  lower  fuel  posi- tion  reducing  engine  speed. (2)  High  Speed  Adjustment.  Adjust  high  speed (2000   RPM   for   MEP-003A)   (2200   RPM   for   MEP- 112A)  by  setting  the  maximum  speed  screw  (18), located   at   the   front   of   the   engine   (clockwise   de- creases   speed,   counterclockwise   increases   speed) with the control knob pulled fully out. (3)  Sensitivity  Adjustment.  Adjust  governor  sen- sitivity  (no  load  to  full  load  speed  droop)  by  turning the  sensitivity  adjusting  ratchet  (16)  counterclockwise (lower  spring)  for  more  sensitivity  (less  speed  droop when  full  load  is  applied)  or  clockwise  (raise  spring) for  less  sensitivity  (more  speed  droop  when  full  load is  applied).  If  the  governor  is  too  sensitive,  a  rapid hunting condition occurs (alternate increasing and de- creasing  of  speed).  Adjust  for  maximum  sensitivity without hunting. d.  Remove.  Disconnect  governor  linkage  (1)  from injector   pump   (2)   and   governor   arm   (3).   Remove governor  arm  (3)  from  governor  shaft  (4).  Remove cotter  pin  (5)  and  pin  (6).  Loosen  nuts  (7)  and  (8). Remove clamp (10). Remove speed control cable (11). Remove  control  bracket  (12)  from  engine  back  plate by removing screw (13), lockwasher (14) and nut (15). Change  6 7-1