TM   5-6115-323-14 Section Ill. OPERATION UNDER UNUSUAL CONDITIONS 2-5. Operation in Extreme Cold (Below 0°F. (- 18°C.)) a.  General.  The  generator  sets  are  designed  for use  in  outdoor  temperatures  as  low  as  –65°F. (–5°C.).  Even  so,  when  possible,  provide  shelter from   winds,   freezing   rain,   and   drifting   snow. Erect  a  wind  shield  or  position  the  unit  behind  a building,  equipment,  or  natural  wind  barrier  such as  a  rock  or  earth  mound.  If  possible,  operate  the unit  in  a  location  that  will  provide  protection  for the  operator  so  as  to  permit  easier  servicing  and better   observation   of   the   unit’s   performance. However, when the unit is operated in an inclosed area,  be  sure  that  proper  provisions  are  made  for removal   of   exhaust   gases.   Remove   accumulated snow  or  ice,  if  possible,  by  moving  the  unit  to  a heated inclosure and allowing the accumulation to melt   after   first   wiping   or   brushing   away   loose deposits.  When  use  of  a  heated  inclosure  is  not practical,  remove  the  deposits  by  wiping,  brush- ing,   or   carefully   picking   the   deposits   away.   Be careful  not  to  scrape,  scratch,  gouge,  or  in  any other  way  damage  the  unit.  Avoid  moving  wiring as  much  as  possible.  Any  time  ice  or  snow  is removed  by  melting,  as  described  above,  change the  oil  in  the  crankcase  and  dry  electrical  parts thoroughly. b .    E n g i n e   ( – 2 5 ° F .   to  – 6 5 ° F . )    ( 3 2 ° C . to –54°C.)). (1)  Lubricate  the  engine  in  accordance  with LO  5-2805-257-12.  Air  Force  will  use  the  lubrica- tion section of applicable T.O. 35C2-3-1-426 Series work  cards. WARNING Use extreme care, when using a torch, to keep flame away from the fuel tank. Do not use a torch, if any fuel leaks are evident, until leaks have been corrected and both the unit and the surrounding area is dry of fuel that has leaked. (2)  To  aid  in  starting,  apply  heat  to  the  en- gine  with  a  suitable  torch,  such  as  a  torch  that conforms to MIL–H–52112, Type I (para 2-4). Play the  torch  flame  back  and  forth  over  the  intake manifold,  oil  pan,  valve  covers  and  air  intake.  Do not  hold  the  flame  in  one  spot.  Keep  flame  and heat  away  from  nonmetallic  parts. (3)  When  the  engine  has  been  warmed,  at- tempt  to  start.  If  it  fails  to  start,  reapply  heat,  as necessary. 2 - 6 (4) After  the  engine  has  been  started,  keep  it running for at least 30 minutes in order to reduce condensation  of  moisture  in  the  crankcase.  Avoid operation for short periods of time. c. Generator  and  Controls. (1) Remove the end cover and clean the cover. (2)  Carefully  remove  any  accumulations  of  ice or  snow  from  around  the  rotor. (3) When using the generator in extreme cold, allow   at   least   a   15-minute   stabilization   period before applying load to the unit. (4)  Keep  generator  controls  and  instruments free  of  snow  and  ice.  Avoid  moving  wiring,  to prevent  cracking  of  insulation. d.  Fuel  System. (1) Keep snow and ice out of the fuel supply. (2)  Keep  the  fuel  tank  full  when  the  unit  is not in operation. (3) Use the proper fuel. (4)  Inspect  the  bowl  of  the  fuel  filter  fre- quently  for  accumulated  moisture  and  if  any  is seen, clean as necessary. (5)  Avoid  unnecessary  bending  of  fuel  hoses. 2–6. Operation in Extreme Heat a. General.  Whenever  possible,  operate  the  unit in  a  shaded  location  that  is  away  from  sources  of heat.  If  the  unit  must  be  used  in  an  area  that  is adjacent to a heat source, erect a heat shield or in some  way  block  the  direct  source  of  heat.  Provide plenty  of  ventilation  and  vent  the  exhaust  gases to  the  outside  when  the  unit  is  to  be  operated  in an inclosed area. b. Engine. (1)  Lubricate  the  engine  in  accordance  with LO  5-2805-257-12.  Air  Force  will  use  the  lubrica- tion section of applicable T.O. 35C2–3-1-426 Series workcards. (2)  Keep  all  engine  air  passages  clean  and free  of  obstructions. c. Generator.  Keep  the  end  cover  openings  clean and  free  of  obstructions. d.   Generator   Controls   and   Instruments.    Keep openings in the control box clean, so as to provide for  free  air  flow.  However,  operate  the  unit  with the  control  box  cover  installed. e. Fuel  System.   Fill fuel tank only to within one inch of the top to allow for expansion of the fuel.