TM  5-6115-332-14 P-8-614-14 TO 35C2-3-424-1 Section III. OPERATION  UNDER  UNUSUAL  CONDITIONS 2-5. Operation in Extreme Cold (Below O°F) (-17.8°C) a.  General.   The   generator   sets   are   designed   to operate   at   temperatures   as   low   as   -65°F   (-53.8°C). To  operate  the  unit  at  temperatures  below  0°F,  posi- tion  the  air  cleaner  intake  shutter  (fig.  2-7)  in  the WINTER   position   and   move   the   oil   pan   baffle   rod (fig.  2-7)  to  the  position  toward  the  front  of  the  en- gine, b.  Engine  Preheating.    When  the  ambient  tem- perature   is   -25°F   (-31.7°C)   and   below,   preheat   the engine.  For  instructions  on  preheating  the  engine using  a  blowtorch,  refer  to  paragraph  2-4. c.   Lubrication.   The   generator   does   not   require lubrication.   For   engine   lubrication   instructions refer   to   LO   5-2805-258-12   and   TM   5-2805-258-14. Additionally,  lubricate  the  ball  joints  at  each  end  of the  throttle  control  rod  with  a  light  oil  suitable  for use   at   0°F   to   -65°F;   order   NSN   9150-00-257-5449, MIL-L-10295. d.   Battery.   Keep   the   battery   fully   charged. After   adding   water   to   the   battery,   charge   the   bat- tery  by  external  means  or  by  running  the  engine  for a  period  of  at  least  one  hour. e.  Fuel  System.   When   not   in   operation,   keep fuel  supply  cans  or  other  containers  full  to  prevent condensation  of  moisture.  Be  careful  to  prevent  ice, snow,   and   moisture   from   entering   the   fuel   system. Accumulated  moisture  will  freeze  and  clog  the   sys- tem.  Inspect  the  fuel  filter  for  accumulated  mois- ture  after  each  operating  period  and  if  any  is  found, service  the  fuel  filter.  Refer  to  TM  5-2805-258-14 for   service   instructions. CAUTION Disturb   wiring   as   little   as   possible during   cold   weather.   Insulation   on wiring   becomes   brittle   when   cold   and will  break  easily. f.   Electrical   Systems.   Keep   wiring   and   elec- trical   components   free   of   ice,   snow,   and   moisture. g.   Operation.   Allow  the  engine  to  warm  thor- oughly   before   applying   load. h.   Protection.   Provide   as   much   protection   for the  equipment  as  is  practical,  at  all  times.  When  the equipment  is  not  in  use,  cover  it  with  canvas  or other   protective   covering. 2-6. Operation in Extreme Heat a.  General.  When  operating  the  equipment  at  a time   when   ambient   temperatures   are   high,   efficient cooling   and   adequate   lubrication   are   vitally   im- portant. b.  Cooling.  Provide   maximum   ventilation   at   all times.   Keep   the   equipment   clean,   paying   particular attention  to  the  engine  shrouds  and  cooling  fins  and the  generator  blower  cover.  See  that  all  air  passages are   free   of   obstructions.   Make   certain   the   air cleaner   shutter   (fig.   2-7)   is   in   the   SUMMER   posi- tion  and  that  the  oil  pan  baffle  rod  (fig.  2-7)  has been  moved  to  the  position  toward  the  rear  of  the engine. c.  Operation.   Do  not   load   the   generator   beyond its  rated  capacity.  If  possible,  keep  the  generator load   to   a   minimum.   Make   frequent   meter   readings to   detect   any   overload.   If   an   overload   is   indicated, reduce  the  load  or  stop  the  unit  and  take  corrective action. d.  Battery.  The   water   in   the   electrolyte   evapo- rates   during   normal   battery   use.   At   high   tem- peratures,   the   loss   of   water   is   accelerated.   Inspect the  electrolyte  level  more  frequently  and  add  water as   required   to   maintain   the   water   level   above plates. 2-7.  Operation  in  Dusty  or  Sandy Areas a. General.  When  the  unit  is  operated  in  dusty or  sandy  areas,  take  special  precautions  to  keep  the unit.   clean   and   adequately   lubricated. b.   Fuel   System.   Use  care  to  prevent  dust  and sand  from  entering  the  fuel  system.  Inspect  the  fuel filter  after  each  operating  period.   Refer  to  TM  5- 2805-258-14   for   filter   service   instructions. 2-19