ARMY TM  5-6115-612-34 MARINE  CORPS  TM  6115-34/8 AIR FORCE TO  35C2-3-471-2 NAVY AG-320B0-MME-O00 CHAPTER 9 MAINTENANCE OF ENGINE EXHAUST 9-1. GENERAL. The engine exhaust (figure   9-1)   provides   the   means   for exhaust gases to be discharged from the generator    set. It     consists     of     an insulated  exhaust  duct  and  an  exhaust nozzle mounted in the exhaust fender of the  generator  set. The  exhaust  nozzle is secured to the engine exhaust with a clamp and extends from    the    engine exhaust   to   the   lower   entrance   of   the exhaust duct. The nozzle    directs exhaust  gases  from  the  engine  into  the exhaust  duct. As  the  hot  exhaust  gas passes from the nozzle into the exhaust duct, a   vacuum   is   created   that   draws cooler   air   from   outside   the   generator set  through  the  oil  cooler  housing  and the  exhaust  fender  louvers.  The  cooler air  mixes  with  the  exhaust  and  lowers the    temperature. The exhaust then travels   up   the   exhaust   duct,   out   the exhaust door, and  into  the  atmosphere. The exhaust duct has two baffles and is lined with sound/thermal insulation that  lowers  exhaust  noise  and  reduces exhaust  fender  temperatures. 9-2. EXHAUST  DUCT  ASSEMBLY. a. Removal. WARNING To  prevent  injury,  do  not  perform maintenance    on    hot    components. Allow adequate time for cooling. (1)  Remove  screws  (1,  figure  9-2) and  lockwashers  (2),  exhaust  door  (3). (2)    Remove    screws    (4),    washers (5), lockwashers (6), and exhaust fender panel (7). (3)    Remove    screws    (8),    washers (9),  and  exhaust  duct  liner  (10)  from exhaust  fender. (4)    Remove    bolts    (11),    washers (12), lockwashers    (13),    and    exhaust duct   end   panel   (14). Remove  sound/ thermal  insulation  (15). (5)    Remove    bolts    (16),    washers (17), lockwashers    (18),    and    exhaust duct inner   side   panel (19). Remove sound/  thermal  insulation  (20). (6)    Remove    bolts    (21),    washers (22), lockwashers    (23),    and    exhaust duct   outer   side   panel   (24). Remove sound/  thermal  insulation  (25). (7)    Remove    bolts    (26),    washers (27), lockwashers (28), and outer exhaust  baffle  (29). b. Inspection  and  Repair. (1)   Inspect exhaust duct for damage. Remove  dents  and  weld  cracks as necessary. (2)   Inspect   sound/thermal   insula- tion   and   replace   if   badly   torn,   com- pacted,  or  otherwise  damaged. c. Installation. (1)   Install   outer   exhaust (29). Secure   with   lockwashers washers  (27),  and  bolts  (26). baffle (28), (2)   Install   sound/thermal   insula- tion   (25)   on   front   of   exhaust   liner. Install  exhaust  duct  outer  side  panel (24). Secure   with   lockwashers   (23), washers  (22),  and  bolts  (21). 9-1