CRANKSHAFT AND MAIN BEARINGS - H.6 Fig. H.10. Three Positions for Lip Type Rear Main Oil Seal. 7. Spread    a    film    of    graphite    grease    over    the exposed inside diameter surface of the strip. 8. Assemble the half housings around the crankshaft  rear  journal  and  fasten  together  by the two setscrews (see Fig. H.9). 9. Swivel the complete seal housing on the shaft to bed   in   the   strips,   and   to   establish   that   the assembly turns on the shaft. 10. Bolt  the  seal  housing  in  position  on  the  block and  the  rear  main  bearing  cap  bridge  piece  and finally tighten with setscrews and spring washers. LIP TYPE CRANKSHAFT REAR END OIL SEAL On  some  engines,  a  circular,  spring  loaded,  lip  seal is  fitted,  which  locates  on  the  periphery  of  the  flange  of the crankshaft.  On production, this seal is fitted with its rear  face  flush  with  the  rear  face  of  the  single  piece housing. This  type  of  seal  is  easily  damaged  and  extreme care  should  be  taken  when  handling  and  fitting  it  to  its housing or to the crankshaft.  Any visual damage across the  lip  of  a  new  seal  will  cause  leakage  and  prevent bedding in of the new seal. The  seal  is  designed  to  function  correctly  with  the direction  of  rotation  of  the  engine  and  for  identification purposes, the seal is marked with an arrow. On   production   the   seal   is   fitted   with   its   rear   face flush with the rear face of the housing.  In service, when a new seal is to be fitted to a worn crankshaft, it should be  pressed  further  into  the  housing,  in  the  first  instance to  1/8  in  (3,2  mm)  or,  if  this  position  has  been  used,  to 1/4 in (6,4 mm) from the rear face of the housing — see Fig. H.10. If   all   three   positions   have   been   used,   it   may   be possible    to    machine    the    worn    sealing    area    of    the crankshaft  flange,  but  not  the  spigot  area  on  which  the flywheel  locates  —  see  Fig.  H.11.    When  a  new  seal  is fitted  to  a  new  or  reconditioned  crankshaft,  it  should  be fitted with its rear face flush with the housing. Before    fitting    the    seal    in    the    housing,    carefully examine  the  seal  for  damage,  especially  on  the  lip  and outside diameter. Using    clean    engine    lubricating    oil,    lubricate    the outside  diameter  of  the  seal  and  the  inside  diameter  of the housing. Press   the   seal   into   the   housing   to   the   required position, taking care that the seal is entered and pressed in squarely, otherwise damage to the outside diameter of the  seal  may  occur,  or  if  it  is  not  square  in  the  housing when fitted to the engine it may leak. The  seal  and  housing  should  be  fitted,  using  seal guide PD 145 (Churchill Tool) as follows: — Clean  the  faces  of  the  cylinder  block  and  oil  seal housing,   and   the   outside   diameter   of   the   crankshaft flange. Check  that  the  seal  and  the  outside  diameter  of  the crankshaft  flange  are  not  damaged.    Where  a  new  seal has been fitted, check that it is in the correct position as previously detailed. Ensure  that  the  two  dowels  are  fitted  in  the  cylinder block.      Coat   both   sides   of   the   housing   with   Perkins (Hylomar) Jointing Compound and position the joint over the dowels in the block. Using    clean    engine    lubricating    oil,    lubricate    the crankshaft   flange,   the   seal   and   the   seal   guide.      The lubrication  of  the  seal  is  necessary  to  prevent  damage that may be caused by initial dry running.