TM 10-3930-671-24 Support  bottom  of  rotor  on  suitable  press,  using  driver that  contacts  inner  bearing  race,  press  assembled  front housing  and  bearing  on  rotor  shaft.    Use  only  sufficient pressure to seat bearing on shoulder of shaft (Figure No. 53). FIGURE NO.  53. INSTALLATION   OF   REAR   BEARING   -   Support   front rotor shaft in press, using drive that contacts inner race, press  rear  bearing  on  shaft  uo  to  the  shoulder  (Figure No.  54). FIGURE NO.  54. Install  new  rear  bearing  retainer  in  rear  bearing  cavity (Figure No.  55). FIGURE NO.  55. ASSEMBLE  HEAT  SINK  TO  REAR  HOUSING  -  The positive  rectifier  diode  heat  sink  is  electrically  insulated from the rear housing by fiber insulators and three mica disc  insulators.    The  carriage  bolts  used  for  stator  and ground  terminals  are  insulated  from  the  heat  sink.    The 1/4" output terminal bolt is a metal to metal contact with the positive heat sink (Figure No.  56). FIGURE NO.  56. Place   each   diode   terminal    screw    through    a    square molded insulator, position in  recess  of  heat  sink  (Figure No.  57).  Place fiber insulating washer, flat steel washer, lockwasher  and  nut  over  each  screw,  tighten  securely (Figure No..58). FIGURE NO.  57. FIGURE NO.  58. F-294