TM  5-6115-584-34 NAVFAC P-8-622-34 TO-35C2-3-456-2 TM-0568C-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   engtne   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 flam- mable   and   moderately   toxic   to   skin,   eyes   and respiratory   tract.   Eye   and   skin   protection   re- quired.   Good   general   ventilation   is   normally adequate. d.   Repair. (1)   Shuttsr   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  and  on  ASK equipped    generators, refer   to   Operator   and   Organizational Maintenance   Manual   and   install   cover   assembly   and   exhaust plenum. 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). Change  6 3-1