TM5-6115-593-34 NAVFAC P-8-631-34 TO-35C2-3-463-2 NOTE Low insulation resistance may be caused by dirt or excessive moisture.  Insulation failure may  be  caused  by  wrong  voltages,  induced voltages   caused   by   opening   field   circuits too quickly, oil and grease, high temperatures, or excessive vibration. Windings  may  be  dried  out  by  heat  from  a warm air oven, heat lamps, or strip heaters. The   temperature   should   not   exceed   167°F (75°C). WARNING WHEN  OVEN  DRYING,  USE  A  FORCED  AIR CIRCULATION     OVEN,     NOT     A     RADIANT TYPE.        RADIANT    TYPE    OVEN    WOULD OVERHEAT     SOME     GENERATOR     PARTS BEFORE     REMOTE     PARTS     REACHED     A SATISFACTORY TEMPERATURE. c. Replacement.  For removal and replacement of the exciter stator, refer to paragraph 11-6. d. Repair. (1) Replace or rebuilt all defective parts. NOTE To    remove    coils    from    core,    heat    in    a moderate oven temperature 302°F (150°C) to facilitate  removal.    Single  coils  should  not be replaced as adjacent parts of the winding may be damaged during coil removal. (2) Apply varnish to any damaged areas of insulation. (3) Replace damaged exciter stator. e. Rebuild. (1) Rebuild exciter stator as follows: (a) Single wires may be spliced by brazing. The splice is to be insulated by sliding sleeving over the wire prior to brazing and relocating the sleeving over the splice after completion. The sleeving is to extend a minimum of 1/2 inch (13 mm) beyond the bare uninsulated portion of wire.  The sleeving material is to be the same as that used for crossovers on the connection end. Splices shall be made in the end turn of the coil only and shall not be made in the straight leg.  Where more than one splice is required, the second splice must not occur on the same coil end and must not occur in adjacent coils.  Where more than one splice is necessary in the same coil or an adjacent coil, the splice may be made in the connection end of the coil. (b) Enamel is to be cleaned from coil extensions.      Cleaning   is   to   start   as   near sleeving  as  possible.  Clean  a  1/2  inch  (13 mm)  section  of  wire  end  projecting  from  a sleeving. Maximum uncleaned wire projecting from a sleeving section shall be 3 inches (76 mm) minimum to 5 inches (127 mm)   maximum.      Wire   diameter   is   to   be reduced a maximum of 5 percent.  Cleaned area  shall  have  enamel  removed  over  80 percent of the surface. (c) Slot tubes should be inserted with overhang equally   divided   on   ends.      Minimum   slot tube overhang (distance from core to end of slot    tube)    shall    be    1/4    inch    (6    mm). Position of the 11-32