COOLING SYSTEM - M.3 Fig. M.3. Separating the Front and Rear Pump Body Sections. loaded   carbon-faced   seal   which   registers   against   the inside (back) face of the impeller. To Remove and Refit Fresh Water Pump Description 1. Remove  the  dynamo/alternator  and  water  pump driving belt. 2. Disconnect  the  inlet  and  outlet  connections  to the water pump. 3. Unscrew  the  five  setscrews  which  pass  through the  pump  and  rear  pump  body  into  the  cylinder block.  Withdraw the pump from the engine (see Fig. M.2). 4. Separation   of   the   front   and   rear   pump   body sections  is  achieved  by  removing  the  securing nuts   and   washers   and   gently   tapping   with   a hide-faced hammer. 5. Refit the pump rear body and water pump in the reverse   sequence   ensuring   that   all   joint   faces are clean, and that new joints are fitted between the   cylinder   block   and   pump   rear   body,   and between the rear body and water pump. 6. Refit   the   dynamo/alternator   and   water   pump driving belt as detailed on Page M.1. Fresh Water Pump Seals Where  ceramic  counter  face  water  pump  seals  are fitted, if the engine is run without coolant, even for a few seconds, the heat build-up between the carbon seal and ceramic   counter   face   is   very   rapid,   resulting   in   the cracking    of    the    ceramic.        This    often    creates    the misunderstanding that the cause of leakage is due to the incorrect   assembly   of   the   sealing   arrangement   of   the water pump. Fig. M.4. Removing the Water Pump Pulley. To Dismantle the Water Pump 1. Unscrew  the self locking nut securing the water pump  pulley  to  the  pump  shaft  and  remove  the nut with plain washer. 2. Using   a   suitable   withdrawal   tool,   remove   the pulley from  the shaft (see Fig. M.4) and remove the pulley driving key from the shaft. 3. Press    the    water    pump    shaft,    complete    with impeller,  out  of  the  water  pump  body  from  the front of the pump. 4. Using a suitable press, remove the impeller from the pump shaft. 5. Remove the water seal from the pump shaft. 6. Remove   the   bearing   retaining   circlip   from   the front of the pump body using circlip pliers. 7. Press the two bearings and distance piece out of the pump body. 8. Finally,    remove    the    front    grease    seal,    seal retainer and flange from the pump body. Inspection 1. Thoroughly wash all the water pump components in cleaning fluid and dry off. 2. Examine  the  pump  body  for  cracks,  damage  or corrosion. 3. Examine  the  drive  shaft  for  wear  ensuring  the inner  diameters  of  the  bearings  are  a  perfect  fit on  the  shaft.    The  shaft  should  be  renewed  if wear  in  this  area  is  sufficient  to  allow  the  races to rotate on the shaft.