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TM 10-6630-247-13&P 4-14. DISTILLATION UNIT MAINTENANCE- cont.   b. Cleaning.  Refer  to  figure  4-4. (1) Using  wiping  rag,  remove  fuel  deposits,  oils,  and  dust  from  refractory  (2). (2) Clean  sides  of  heater  housing  (8)  with  wiping  rag, c. Inspection.  Refer  to  figure  4-4. (1) Inspect  heater  housing  (8)  for  cracks,  dents  and  evidence  of  overheating. (2) Check  for  bent  or  cracked  control  knob  (10),  Knob  should  turn  smoothly  in  both  direction, (3) Inspect  power  cord  (9)  for  cuts,  torn  insulation  or  damaged  plug. NOTE Distillation  unit  heater  does  not  have  an  insulating  spacer  installed under  the  refractory. (4) Inspect  heating  element  (4,  figure  4-5)  for  burned,  broken  or  shorted  coils. (5) Inspect  refractory  (6)  for  cracks,  broken  or  missing  pieces,  and  loose  or  missing  terminal lugs (5). d. Repair.  Refer  to  figure  4-5. (1) Remove  two  screws  (1)  and  flat  washers  (2)  securing  heating  element  leads  (3)  to  lugs  (5). (2) Straighten  element  leads  (3)  and  pull  defective  element  (4)  from  top  of  refractory  (6). - NOTE It  will  be  necessary  to  stretch  the  coils  of  the  replacement  heater  element to  fit  around  refractory  dividers. (3) Place  new  heater  element  (4)  on  top  of  refractory  (6)  with  element  leads  (3)  positioned through  refractory  (6)  at  lugs  (5). (4) Stretch  coils  of  heating  element  (4)  around  dividers  (7)  as  shown. (5) Loosely install two flat washers (2) and screws (1) in lugs (5). (6) Wrap  element  leads  (3)  around  screws  (1),  then  tighten  screws, 4-14

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