TM 5-6115-585-34 NAVFAC P-8-623-34 TO-35C2-3-455-2 TM-05684C/05685B-34 CHAPTER  3 MAINTENANCE  OF  COOLING  SYSTEM Section  I.  DESCRIPTION  AND  FUNCTION 3-1.   GENERAL. ator   and   forces   it   out   openings   near   the   engine.   The engine   air   outlet   uses   a   shutter   assembly   to   control engine   temperature.   A   thermostatic   element   controls The   engine   has   a   pressure   air   cooling   system.   Fins shutter  opening  which  limits  air  flow  when  the  engine on  the  engine  blower  draw  air  into  the  front  of  the is   cold.   When   the   engine   air   temperature   reaches engine  housing  and  force  it  past  the  cylinders  and  out approximately  120°  F,  (49”  C)  the  shutters  begin  to the  right  side  of  the  engine.  A  separate  blower  on  the open.   The   shutters   are   completely   open   at   140°   F generator   rotor   draws   air   into   the   rear   of   the   gener- (60°  C)  under  full  rated  load. Section  II.  MAINTENANCE 3-2. ENGINE COOLING SYSTEM. a. Inspect  on  equipment  (see  figure  3-1).  On  ASK  equipped generators,  refer  to  Operator  and  Organizational  Maintenance Manual and remove cover assembly and exhaust plenum. (1)   Shutter   Assembly.   Inspect   shutter   assembly (1)   for   physical   damage.   Check   for   debris   within   as- sembly.   Check   for   smooth   operation   of   shutters   when moved   manually.   Check   for   chipped   paint   or   rusting. (2)   Bracket   Assembly.   Inspect   that   brackets   (2) are   securely   mounted   to   shutters   (3).   Check   that bracket   bearings   are   not   excessively   worn.   Refer   to Operator and   Organizational   Maintenance Manual (3)   Shutters.   Inspect   shutters   (3)   for   physical damage   and   secure   mounting   to   brackets   (2). (4)  Air  Housing  Panel  and  Door.  Inspect  air  hous- ing  panel  and  door  (5)  for  physical  damage. (5)   Grille.   Inspect   grille   (6)   for   secure   mounting to blower   housing   (7).   Check   for   physical   damage. (For units without ASK.) (6)  Blower   Housing.   Inspect   blower   housing   (7) for   physical   damage.   Check   that   blower   housing   is securely   mounted   to engine. b.  Removal.  Refer  to  Operator  and  Organizational  Maintenance Manual. c.   Disassemble.   Disassemble   repairable   com- ponents   of   the   cooling   system   per   Operator   and Organizational   Maintenance   Manual. Solvent,  Dry  Cleaning  P-D-680,  Type  II  is flammable  and  moderately  toxic  to  skin,  eyes and   respiratory   tract.   Eye   and   skin   protec- tion   required.   Good   general   ventilation   is d.   Repair. (1)   Shutter   Assembly.   Refer   to   Operator   and Organizational   Maintenance   Manual   to   remove   and replace   defective   components.   Repair   physical   damage by   removing   the   dents,   welding   breaks   in   shutter   as- sembly   box.   Clean   repaired   area   with   dry   cleaning solvent   Federal   Specification   P-D-680.   Paint   as   re- quired  with  MIL-T-704,  type  A,  semigloss,  olive  drab, color  no.  24087. (2)   Bracket   Assemblies.   Replace   bracket   (2)   or bearings   if   required. (3)   Shutters.   Bump   out   dents   and   straighten   shut- ters   (3)   if   required.   Clean   with   dry   cleaning   solvent and  repaint  if  necessary. (4)  Air  Housing  Panel  and  Door.  Clean  air  hous- ing   panel   and   door   (5)   with   dry   cleaning   solvent   and repaint   if   necessary. (5)   Grille.   Straighten   any   bent   wires   on   grille (6) or  weld  if  required  to repair. (For units without ASK.) (6)  Blower,  Housing. Bump  out  dents  in  blower housing   (7),   repair   cracks   with   welds   if   necessary and  clean  with  dry  cleaning  solvent.  Paint  as  required. e. Installation. Install engine cooling system. On ASK equipped generators,  install  cover  and  exhaust  plenum  assemblies  per Operator  and  Organizational  Maintenance  Manual. 3-3.  HIGH  TEMPERATURE  CUTOUT  SWITCH. a. Remove  (see  figure  3-1).  On   ASK   equipped   generators, refer  to  Operator  and  Organizational  Maintenance  Manual  and remove top panel assembly and exhaust plenum. (1)   Disconnect   electrical   leads   (10). (2)  Straighten  locking  tab  (12)  and  remove  switch (11). normally   adequate. Change   6   3 - 1