TM  5-6115-584-34 NAVFAC  P-8-622-34 TO-35C2-3-456-2 TM-0568C-34 CHAPTER 7 MAINTENANCE OF ENGINE Section I. DESCRIPTION AND FUNCTION 7-1. GENERAL. by using correct shim between rear bearing plate and cylin- der block. One piece, press fit oil seals are used to seal both ends of crankshaft. A mechanical governor is used to regulate engine The engine is a two cylinder, air-cooled, overhead valve, fuel speed  under  varying  generator  load  conditions.  Since  the injected, diesel. End crankshaft and camshaft bearings are engine is direct coupled to the generator, 1800 RPM engine press fit one piece bearings. Crankshaft end play is adjusted speed  produces  60  Hz  generator  output. Section II. ENGINE EXTERNAL ASSEMBLY 7-2.  FUEL  LINES. Cap, plug, or tape all fuel lines and fittings as well as injector and pump openings to keep dirt from  enter- ing fuel system. a. Removal. On ASK equipped generators, refer to Operator and Organizational Maintenance Manual and remove right panel assem- bly.  Tag  and  remove  injector  nozzle  return  lines  (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. NOTE For Torque information on fuel line fittings see Table 1-1. c.  Installation.  Remove  plugs  or  tape  from  lines  and  ftitings. 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, On ASK equipped generators, refer to Operator and Organizational Maintenance Manual and replace right panel assembly. 7-3. EXTERNAL GOVERNOR PARTS AND SPEED 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 61.5 Hz at no load. Apply full rated load to unit. Gover- nor should adjust engine speed to equal 60 Hz output 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) by repositioning the control nut (7, figure 7-2) at the attaching bracket located inaide the engine access door. The control knob should be pushed fully in before making the low speed adjust- ment. This reduces tension on  the  spring  (17)  permitting  gover- nor arm (3) to move the injector pump (2) to lower fuel position reducing  engine  speed. (2)  High  Speed  Adjustment.  Adjust  high  speed  (2250 RPM) by setting the maximum speed stop screw (18), located at   the   front   of   the   engine   (clockwise   lowers   speed, counterclockwise  increases  speed)  with  the  control  knob  pulled fully out. The control knob can then be intermediately posi- tioned for 61.5 Hz (no load) operation. (3) Sensitivity Adjustment. Adjust governor sensitivity (no load to full load speed droop) by turning the sensitivity ad- justing 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 decreasing 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) and 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