ENGINE DIVISION SERVICE MANUAL TM 5-4210-230-14&P-1 Distributors  with  tachometer  drive  have  one thrust washer (Figure 22). Distributors without tachometer drive have two thrust   washers   (Figure   21)   which   must   be installed  properly.    Install  outer  washer  (blue steel)   first   with   lip   of   washer   facing   toward lower end of shaft.  Install inner thrust washer (silver color) with lip facing lower end of shaft. Inner  (silver  color)  washer  should  seat  on  lip of outer (blued) washer. b. Lubricate distributor shaft engine oil. c. Slide distributor shaft into distributor housing. Use   care   to   avoid   damaging   lower   oil   seal where used, when installing shaft. 2. Position new lower thrust washer(s) on shaft. Distributors  for  V-537  engine  have  one  thrust washer (Figure 20). All   distributors   except   for   V-537   engine   have two  thrust  washers  (Figure  19)  which  must  be installed  properly.    Install  inner  washer  (silver color)   first   with   lip   of   washer   facing   toward distributor  housing.    Install  outer  washer  (blued steel)  with  lip  facing  toward  distributor  housing. Outer (blued) washer should seat in inner (silver color) washer. 3. Install   distributor   driven   gear   or   thrust   collar   as outlined below: If original distributor driven gear or thrust collar is being used: a. Position   gear   or   thrust   collar   on   distributor shaft  and  align  roll  pin  hole  in  gear  or  thrust collar with roll pin hole in shaft. b. Install driven gear or thrust collar roll pin. If  new  distributor  driven  gear  or  thrust  collar  is being installed: New   gear   or   thrust   collar   will   have   pin   hole drilled in one side only. Install as follows: a.     Position gear or thrust collar on distributor shaft and align hole with pin hole in shaft. b. Support   distributor   assembly   in   drill   press. Using existing hole in gear or thrust collar as a guide, drill roll pin hole in other side of gear or thrust collar. c. Install roll pin. If new distributor shaft and gear or thrust collar are being installed: a. Position   gear   or   thrust   collar   on   distributor shaft  and  establish  specified  shaft  end  play (See DISTRIBUTOR TEST SPECIFICATIONS). b. Support   distributor   assembly   in   drill   press. Using existing hole in gear or thrust collar as a guide, drill roll pin hole in distributor shaft and other side of gear or thrust collar. c. Install roll pin. 4. Install  electronic  control  unit  (circuit  board,  sensor and plate assembly) as follows: a. Lift  sensor  advance  plate  of  control  unit  and put a small amount of premium quality grease (Mobile No.  532 or equivalent) under each of the three thrust buttons. b. Position    control    unit    assembly    and    wiring grommet in distributor housing. c. Install distributor plate (control unit) mounting screws. 5. Position  vacuum  advance  diaphragm  assembly  on distributor housing and install mounting screws. 6. Install  felt  washer  on  diaphragm  rod  pin  of  sensor advance   plate   (Figure   13).      Oil   felt   washer   with engine oil. Connect    diaphragm    rod    to    pin    on    sensor advance   and   install   flat   washer   (where   used) and rod retaining "E" clip.  (Figure 12) 7. Adjust trigger wheel-to-sensor air gap as follows: a. Rotate trigger wheel until one tooth is aligned with  centerline  of  sensor  (trigger  wheel  tooth perpendicular    to    flat    surface    of    sensor). (Figure 43) b. Using feeler gauge, measure air gap between sensor and end CGES-145-U  Page 20 PRINTED IN UNITED STATES OF AMERICA