CRANKSHAFT AND MAIN BEARINGS—H.4 3. Clean  the  bearing  housings  and  place  the  top  half bearings  in  position.    Liberally  oil  the  bearings  with clean oil. 4. Place the crankshaft in position. 5. Oil  the  two  upper  thrust  washer  halves  and  slide them  into  the  recesses  provided  on  either  side  of the center main bearing housing. 6. Fit  the  lower  halves  of  the  main  hearings  to  the hearing caps.  Oil the hearings and place the caps in their respective positions ensuring that the lower halves of the thrust washers are correctly positioned on either side of the center main bearing cap.      When   replacing   the   main   bearing   caps, ensure    that    they    are    fitted    in    their    respective positions,  also  that  they  are  fitted  the  correct  way round.  The caps are numbered, No.  I commencing at the front of the engine.  Each cap is also marked with  a  serial  number  as  stamped  on  the  cylinder block bottom face.  These should read in line (See Fig. H.3). 7. Examine   main   bearing   setscrews   for   damage   of threads,  etc.,  replace  where  necessary.    It  is  no longer necessary to fit tab washers to main bearing setscrews. 8. Evenly   tighten   the   main   hearing   setscrews   to   a torque wrench setting as given on Page B.1. 9. Check   the   crankshaft   end   float   to   ensure   that  a clearance  of  0.002/0.015  in  (0,05/0,38  mm)  exists. Oversize   thrust   washers   may   be   fitted   (see   Fig. H.5) 10. Refit the connecting rod caps and big end bearings (See Page F.4). 11. Refit   the   rear   main   bearing   bridge   piece   to   the cylinder  block  together  with  new  joints  and  sealing rubbers (see Fig. H.6).  Ensure that the rear face of the bridge piece is in alignment with the rear face of the cylinder block (see Fig. H.7). 12. Fit  new  sealing  strips  to  the  rear  main  bearing  oil seal housings and refit the hous- Fig. H.5 Checking the Crankshaft End Float. ings  as  described  in  Rope  Type  Crankshaft  Rear End   Oil   Seal.      With   lip   type   seals,   refit   oil   seal housing  as  described  in  Lip  Type  Crankshaft  Rear End Oil Seal. 13. Refit   and   correctly   align   tile   flywheel   housing   as described   on   Page   P.3.      Refit   the   flywheel   and starter motor. 14. Refit  the  oil  pump,  timing  case  and  timing  gears (see Page L.5 and K.,3) 15. Refit  the  sump,  sump  strainer   and   the   oil   pump suction and delivery pipes. ROPE TYPE CRANKSHAFT REAR END OIL SEAL The housing  consists of two halves bolted around the rear   of   the   crankshaft   which   has   a   shallow   spiral   oil return groove machined in it to a depth of 0.004/0.008 in (0,10/0.20 mm).  The bore of the housing is machined to accommodate  a  rubber  cored  asbestos  strip.    The  strip consists of two sections, one for each half of the oil seal housing. When fitting the seal the following procedure should be adopted:— 1. Set   up   a   half   housing   in   the   vice   with   the   seal recess uppermost.