CHAPTER 3 OPERATOR  AND  ORGANIZATIONAL  MAINTENANCE  INSTRUCTIONS Section I. OPERATOR AND ORGANIZATIONAL MAINTENANCE REPAIR  PARTS,  TOOLS,  AND  EQUIPMENT 3-1.  Tools  and  Equipment. are  required  by  operator  or  organizational  mainten- ance  personnel  for  maintenance  of  the  engine  gen- a.   Basic   Issue   (Army).   Tools   and   repair   parts erator   set. issued  with  or  authorized  for  use  with  the  engine generator  set  are  listed  in  the  basic  issue   items   list, 3-2.   Organizational   Maintenance   Repair   Parts   (Army). Appendix B of this manual. Organizational maintenance repair parts are listed b.  Special  Tools.   No   special   tools   or   equipment and  illustrated  in  the  publications  listed  in  Appendix  A. Section   II.   LUBRICATION 3-3.   General   Lubrication   Information. WARNING To avoid accidental engine cranking or startup, set  CKT BRK switch (fig.  2-5)  to  OPEN  position  and  dis- connect   cable   from   battery   negative terminal,   prior   to   servicing   the engine   generator   set.   Reconnect cable   at   completion   of   service procedures. a.   This   paragraph   contains   a   reproduction   of   the lubrication   order   and   lubrication   instructions   which are   supplemental   to,   and   not   covered   in   the   lubrica- tion   order. b.  The  lubrication  order  shown  in  figure  3-1  is  an exact   reproduction   of   the   approved   lubrication   order. Refer to DA Pam 310-4 (Army) for the current LO. c. The oil level gage (fig. 3-2) is the shielded type which allows the operator to  check oil  level  while the engine is either stopped or running. The gage is stamped  on  both  sides  to  indicate  two  different  oil level   locations.   The   engine   RUNNING   side   is   stamped ADD,  FULL,  and  RUNNING.  The  engine  STOPPED side  is  stamped  ADD,  FULL,  and  STOPPED. CAUTION Use  appropriate  ADD  and  FULL marks  depending  upon  whether the  engine  is  stopped  or  running. d.  The  engine  cannot  be  operated  safely  when  the oil  level  has  dropped  to  the  add  mark  on  the  oil  level gage,  oil  must  be  added  to  raise  its  level  to  the  full mark.   When   oil   level   is   at   the   full   mark,   the   proper amount   of   oil   is   in   the   crankcase.   Never   fill   crank- case   above   full   marks. e. A seal  in  the  oil  level  gage  cap  prevents  oil from  leaking  to  the  outside  of  the  engine  and  foreign material   from   entering. For   these   reasons,   the gage  must  be  kept  tight  on  the  level  gage  adaptor. Each  time  oil  is  changed,  inspect  the  seal  to  make certain  it  is  in  good  condition. f .   T h e    p u r p o s e    o f    t h e    b r e a t h e r    t u b es 2,   6,   &   8,   fig.   3-12.1)   is   to   vent   the inside   of   the   engine   thus   preventing pressure   buildup   and   removing   harmful vapors   from   the   crankcase   ,   gear   train, and  valve  compartment  .  Fumes  are  redi- rected   into   the   air   intake   system   and burned   in   the   combustion   of   the   engine. If   the   tubes   become   clogged,   vapors   are trapped   within   the   engine,   and   pressure buildup   could   force   oil   past   crankcase seals,   oil   level   gauge   or   cylinder   head cover   gasket. 3-4.  Detailed  Lubrication  information. a.   General.   Keep   all   lubricants   in   closed   con- tainers  and  store  in  a  clean,  dry  place  away  from external   heat. Allow  no  dust,  dirt  or  other  foreign material   to   mix   with   the   lubricants.   Keep   all lubrication   equipment   clean   and   ready   for   use. NOTE When  changing  oil,  drain  valve must  be  open  to  drain  crankcase and   closed   before   refilling. (1)   Lubricating   oil   must   be   in   accordance with   the   requirements   of   figure   3-1.   Keep   oil   free of  water  and  abrasives  by  proper  handling  and storage. (2)   Before   each   period   of   operation,   check oil   level   in   the   crankcase. If   necessary,   add   oil to  bring  level  to  full  mark  on  the  oil  level  gage, Inspect  engine  for  evidence  of  oil  leaks  and  make necessary   repairs. (3) After each operation interval of 100 hours, Change   12   3-1