TM 9-2350-256-34-1 1 Remove the four screws (1) which secure the air inlet louver (2) to blower housing assembly (3), and remove the louver. 2 Remove   the   setscrew   that   secures   the combustion  blower  wheel  (12)  to  the  end  of  the motor shaft; remove the blower wheel. Remove the two  nuts  (11)  and  remove  the  secondary  blower cover assembly (10) from studs of the motor. 3 Clip   and   remove   the   cable   assembly strap  (16).  Remove  the  three  screws  (9)  which  secure the  flange  of  the  motor  (7)  to  the  motor  mounting brackets (8). 4 Remove six screws (4) securing the motor mounting  brackets  (8)  to  the  mounting  flange  and blower  housing  assembly  (3).  Remove  two  of  the brackets; the resistor and cable assembly (items 14 through  22)  remain  attached  to  the  third  bracket. 5 Remove  the  four  screws  (4)  securing  the diode  mounting  assembly  (13)  and  voltage  limiter  (5) to the mounting flange and blower housing assem- bly.  Pull  out  the  connected  motor  (7),  diode mounting assembly, voltage limiter, and resistor to remove  them  from  the  flange  and  blower  housing assembly. 6 Loosen  the  setscrew  in  the  collar  of  the ventilation blower wheel assembly (6) and pull the blower  wheel  from  the  motor  shaft. 7.  Remove  the  screw  which  secures  the diode mounting assembly ground lead to the motor housing.  Remove  the  screw  (23)  which  secures  the motor power lead to the diode mounting assembly; disconnect  the  lead. 8 Disconnect  the  cable  assembly  (17)  and diode mounting assembly lead from the resistor (22) by removing the screws (18) and nuts (15). 9 Remove  nut  (14)  from  screw  (19)  that secures resistor (22) from screw (19). (2) Electrical inlet assembly (fig. 3-10.2) NOTE It is rarely necessary to remove the elec- trical inlet assembly unless the assembly itself  is  damaged,  or  the  heater  is  being completed overhauled. It is not necessary to  completely  remove  the  electrical  inlet assembly  to  remove  the  burner  or  heat  ex- changer. (a)  Remove  the  guard  assembly  (16)  by releasing  the  two  fasteners  attaching  the  guard  to the heater housing (28). (b)  Cut  the  two  cable  assembly  straps  (37) which   bundle   the   cable   assemblies   (38,   40,   43) together.   Remove   screws   (42)   as   necessary   to disconnect  the  wires  from  the  terminal  strip. (c)  Remove  the  igniter  ground  from  the  ter- minal (31 ) on the heater housing. Remove the nut (29) from the grounding stud on the heater housing and pull off the inlet assembly grounding lead, the lockwashers (30 and 32), and the terminal (31). (d) Remove  lead  from  connector  D  on  recep- tacle  to  terminal  on  flame  detector  switch  (21)  by removing  screw  (20)  in  the  switch  terminal. (e)  Loosen   two   fasteners   and   remove   elec- trical  inlet  assembly. (3) Igniter (fig. 3-10.2). (a)  Loosen  the  two  Dzus  fasteners  which secure  the  guard  assembly  (16)  to  the  top  of  the heater;  remove  the  guard. (b) Disconnect electrical cable at the heater. (c)  Loosen  the  two  Dzus  fasteners  which secure  the  electrical  inlet  assembly  (36)  to  the  heater housing  (28).  Pull  the  inlet  assembly  up,  disengage  it from the igniter leads and the fuel tube (5) and swing it out of the way without disconnecting any wires or removing the cable from the plug-in connector. (d) Push  down  on  the  top  of  the  igniter  (9), rotate it 1/8 turn counterclockwise, and pull it out to remove  it  from  the  heater,  The  igniter  can  be removed without disconnecting the leads. (e) Remove  the  seal  (35)  from  the  top  of  the heater  housing, (4) Flame detector switch (fig. 3-10.2). (a)  Loosen  the  two  Dzus  fasteners  which secure  the  guard  assembly  (16)  to  the  top  of  the heater;  remove  the  guard. (b)  Check  that  the  four  wires  to  the  flame detector switch (21) are labeled, and disconnect the wires  by  removing  the  four  screws  (20). (c) Use  an  open-end  wrench  to  unscrew  the compression nut (22) which secures the flame detec- tor  switch  to  the  heat  exchanger  (15).  Pull  the  switch straight out to remove it. (5) Ouerheat switch (fig. 3-10.2). (a)  Loosen  the  two  Dzus  fasteners  which secure  the  guard  assembly  (16)  to  the  top  of  the heater;  remove  the  guard. (b) Check  that  the  two  wires  to  terminals  9 and  30  are  labeled,  and  disconnect  them  from  the overheat  switch  (24)  by  removing  screws  (19). (c) Remove  the  two  screws  (18)  which  secure the  overheat  switch  to  the  top  of  the  heater  and remove the switch. (6) Fuel  control  value. (a)  Bleeding.  The  fuel  lines  and  fuel  control valve body must be bled whenever the fuel system runs dry, or if service is performed on the fuel lines or  fuel  filter.  Bleed  as  follows: 1 Bleed the fuel system up to the heater by loosening  the  fuel  connection  where  it  enters  the valve  body.  Let  the  fuel  drip  out  until  it  is  free  of bubbles,  then  reconnect  the  fuel  line. 2 Slide  a  piece  of  3/16  ID  tubing  over  the 3-18.4 Change   2