TM 10-3930-653-14&P Centrifugal advance mechanical parts When cause of engine trouble is traced to centrigual advance mechanical part. use distributor tester to check its characteristics. When    nothing    is    wrong    with    its    characteristics, conceivable  causes  are  faultiness  or  abnormal  wear  of driving part or other part. Do     not     disassemble     it.     In     case     of     improper characteristics, remove on-off switch part and check cam assembly closely. governor weights.  shaft and governor springs, etc. When    centrifugal    advance    mechanical    parts    are good,  be  sure  to  check  advance  characteristics  with  a distributor tester. 4-7-7-3.  DISASSEMBLY AND ASSEMBLY (1)   DISASSEMBLY To disassemble, follow the procedure below. (1)   Take off cap and disconnect rotor head. (2)   Remove vacuum controller. Fig. 4-210.  Disassembling Vacuum Controller (3)   Remove contact breaker. Fig. 4-211.  Removing Contact Set (4)   When  contact  breaker  is  disassembled,  be  careful not   to   lose   steel   balls   between   breaker   spring   and breaker plate. Fig. 4-212.  Removing Contract Breaker (5)   Pull  knock  pin  out  and  disconnect  collar  to  remove the entire rotating parts. Fig. 4-213.  Removing Knock Pin Fig. 4-214.  Removing Rotation Parts (6)   When cam is to be removed, first remove set screw since  shaft  head  is  fastened  by  the  screw  to  hold  cam down.  Put  match  mark  across  cam  and  shaft  so  that original combination can be restored at assembly. (7)   When governor weights and springs are disconnected,    be    careful    not    to    stretch    or    deform governor springs. After     disassembling.     apply     grease     to     governor weights. 4-117