before  installing  in  the  pump  body. CAUTION Do  not  force  the  bearing  shaft  assembly into  the  pump  body  by  putting  pressure  on the  end  of  the  shaft.  Use  a  tool  which puts   the   force   on   the   outside   race.   This will  prevent  the  possibility  of  pitting  the races  of  the  bearing  by  the  balls  within it  when  more  force  than  required  is  used to  seat  the  bearing  in  the  pump  body. (3)  Position  pump  on  press  with  pulley  hub  end of  shaft  firmly  supported  on  the  press  base  plate. Position  impeller  on  upper  end  of  shaft.  Using  a collar   between   the   impeller   and   the   press   ram,   press impeller  on  shaft  to  attain  0.015  inch  maximum feeler   gage   clearance   between   impeller   and   body. CAUTION Seal  face  of  impeller  must  be  free  of  oil, grease,   and   fingerprints   before   installing impeller. (4)  Position  water  pump  on  a  press  with  the impeller  end  of  the  shaft  firmly  supported  on  the  press base   plate.   Use   a   collar   between   pulley   hub   and   press ram  because  the  end  of  the  shaft  protrudes  beyond pulley  hub;  press  pulley  hub  on  shaft  to  within  four inches  (±  0.010  inch)  between  bottom  of  pump  body and  the  fan  side  on  the  pulley  hub  flange. (5)  Rotate  pulley  hub  and  check  for  proper operation  of  the  water  pump  assembly. NOTE A  slight  drag  caused  by  mating  surfaces of   the   seal   assembly   and   impeller   is normal. b.   Pump   Installation. Refer   to   Operator   and   Organizational   Maintenance Manual. c.   Fan   Installation. Refer   to   Operator   and   Organizational   Maintenance Manual. Section XI. CRANKSHAFT PULLEY AND VIBRATION DAMPENER, AND ENGINE FRONT SUPPORT 14-60.   General. a.  The  crankshaft  pulley,  mounted  on  the  front end-of  the  crankshaft,  is  used  to  transfer  drive  power from   the   crankshaft   to   belt   driven   accessories   such as   the   water   pump,   fan   and   alternator. b.  Vibration  dampening  is  accomplished  by  bonding a  neoprene  compound  between  the  crankshaft  pulley and  the  crankshaft  hub. c.  The  engine  front  support  is  the  trunnion  type, and  mounts  to  the  skid  base. 14-61.   Removal   and   Cleaning. a.  Removal. — (1)   Remove   crankshaft   pulley   retaining   capscrew and  washer. See  figure  14-28. (2)   To   remove   crankshaft   pulley,   use   universal puller  kit  with  threaded  adapters  that  fit  into  tapped holes  on  face  of  pulley. CAUTION Do   not   use   gear   puller   that   applies   pressure to   pulley   outer   diameter.   TO  do  so  will result  in  damage  to  the  pulley. (3)  Remove  pulley  and  dampener  assembly,  and the  woodruff  key  from  the  crankshaft. (4)  Remove  the  two  screws  in  the  engine  front support  assembly  that  secure  the  bracket  set.  Re- move   the   liners.   See   figure   14-29. 14-62 (5)  Note  the  number  of  shimming  washers  re- moved  between  the  upper  and  lower  bracket. b. Cleaning. (1)  Clean  pulley  and  support  with  cloth  or brush   dipped   in   cleaning   solvent,   Federal   Specifica- tion   P-D-680. (2)   Ensure   that   neoprene   dampener   is   not exposed  to  cleaning  solvent. 14-62.   Engine   Front   Support   Inspection. Inspect  front  support  for  cracking  or  other  signs  of damage. 14-63.   Crankshaft   Pulley   and   Vibration   Dampener and   Engine   Front   Support   Installation. a.  Remove   any   burrs   from   crankshaft   with   a fine   mill   file,   if   necessary,   and   install   woodruff   key into   crankshaft   keyway. b.  Align  crankshaft  pulley  and  dampener  assembly keyway  with  the  crankshaft  keyway  and  install assembly   on   crankshaft. c.   Install   retaining   capscrew   and   washer   and tighten  capscrew  to  200  to  220  foot-pounds. d.   Insert   liners   in   front   support   brackets. e.   Install   bracket   on   cross-member   in   position   on main   frame.   Install   bracket   securing   hardware.