FUEL SYSTEM - N.4 6. Remove  the  valves  from  the  upper  body  half  by carefully  levering  from  their  locations.    Remove the    valve    gaskets    from    the    bottom    of    the recesses. 7. Remove the pump cover and pulsator diaphragm   by   unscrewing   and   removing   the cover retaining screw. Inspection of Parts 1. Thoroughly wash all parts in cleaning fluid. 2. Check  the  diaphragm  for  hardening  or  cracking and  examine  the  pull  rod  for  wear  at  the  point where   it   connects   with   the   rocker   lever   link. Renew  the  diaphragm  and  pull  rod  assembly  if any of these signs are evident. 3. The diaphragm spring should be renewed if it is corroded  or  distorted.    Ensure  that  if  renewing the spring, the new spring has the same (green) colour identification. 4. The  valves  should  be  renewed  unless  in  perfect condition.  The two valves are identical and may be  used  for  inlet  or  outlet  (See  Fig.  N.5).    It  is advisable    to    renew    the    valve    gaskets    after dismantling. 5. Examine the rocker, arm, link, spring and pin for wear.    If  appreciable  wear  is  evident  new  parts must be fitted. 6. Check  the  pulsator  diaphragm  for  condition  and renew if necessary. 7. Replace   all   gaskets   and   washers   as   routine procedure. 8. Examine  the  flanges  of  the  two  pump  halves  for distortion.      If   distorted   lightly   linish   to   restore flatness. To Re-Assemble the Pump 1. Place  the  new  valve  gaskets  in  position  in  the valve  recesses  and  fit  the  valves  to  the  body. The  inlet  valve  must  be  fitted  so  that  the  valve can   open   to   admit   fuel,   i.e.,   the   spring   must protrude     into     pump     chamber     towards     the diaphragm.    The  outlet  valve  must  be  fitted  in the  reverse  position  to  the  inlet  valve,  so  that  it allows flow of fuel out of the pump.  To retain the valves  in  the  casting,  replace  retaining  plate  or stake  the  casing  in  six  places  with  a  suitable punch. 2. Place   the   pulsator   diaphragm   in   the   pulsator cover  and  secure  on  the  upper  casting  with  the washer and screw. 3. Insert  the  rocker  arm  pin  through  its  hole  in  the body, at the same time engaging the link and the rocker  arm.    During  this  operation  ensure  that the  rocker  arm  spring  is  located  properly  in  the pump body.  Tap the rocker arm pin in until it is flush  with  the  pump  body.    Stake  the  casting  in three places each side to retain the pin. 4. Place   the   diaphragm   spring   in   position   in   the pump body. 5. Place  the  diaphragm  assembly  over  the  spring, the  pull  rod  being  downwards,  and  centre  the upper  end  of  the  spring  in  the  lower  diaphragm protector washer. 6. Press   downward   on   the   diaphragm   and   make sure    that    the    downward    tag    on    the    lower diaphragm  protecting  washer  is  on  the  priming lever side of the body.  This tag is required to be in  the  hole  of  the  body  ready  for  fitment  of  the priming  lever.    Engage  the  diaphragm  pull  rod with  the  link  and  at  the  same  time  permit  the matching  up  of  the  holes  in  the  diaphragm  with those on the pump body flanges. 7. Push the rocker  arm  towards  the  pump  until  the diaphragm  is  level  with  the  body  flange.    Place the   upper   half   of   the   pump   into   its   proper position as shown by the file mark on the flanges made   prior   to   dismantling.      Install   the   cover screws  and  washers  and  tighten  only  until  the heads of the screws just engage the washer. Release the rocker arm and push on the spaded end of the rod so as to hold the diaphragm at the top  of  the  stroke,  and  while  so  held  tighten  the securing screws diagonally and squarely. NOTE:      After   assembling   in   the   manner described,    the    edges    of    the    diaphragm should  be  about  flush  with  its  two  clamping flanges.    Any  appreciable  protrusion  of  the diaphragm     indicates     incorrect     fitting     in which  case  especial  care  should  be  paid  to maintaining  pressure  on  the  pull  rod  while the diaphragm screws are finally tightened. 8. Fit primer to side of body and retain with the pin. Clip on priming lever spring. 9. Test the fuel lift pump to ensure that it is working correctly.