(3)   Remove   piston   and   connecting   rod   assem- blies. (para   14-81.) (4)   Remove   crankshaft   and   cylinder   sleeves (refer  to  paragraphs  (a)  and  (b)  above). (5)   Drive   camshaft   bearings   from   block.   (fig. 14-41.) 14-86.   Crankshaft,   Cylinder   Sleeves,   Camshaft Bearings   and   Cylinder   Block   Cleaning,   Inspection and   Repair. a.    Crankshaft. (1)   Clean   crankshaft   thoroughly   and   inspect   the journals   for   scoring,   chipping,   cracking,   or   signs of   overheating. If   crankshaft   has   been   overheated (usually   indicated   by   discolored   or   blue   bearing   jour- nal  surfaces),  or  is  scored  or  excessively  worn,  re- conditioning  or  replacement  will  be  required.  Exa- mine   bearing   journals   for   cracks   if   overheating   has occurred. (fig.  14-41.) (2)   Measure   the   crankshaft   main   bearing   and connecting   rod   journals   at   several   places   on   their diameter   to   check   for   roundness.   The   diameter   of main   bearing   journals   is   3.2465   to   3.248   inches;   con- necting   rod   journals   is   2.747   to   2.7485   inches.   The only   recommended   method   of   reconditioning   the   crank- shaft  is  regrinding,  as  required,  to  accommodate undersize   bearing. Chrome   plating   or   metallizing   the bearing   journals   is   not   acceptable. (3)  All  main  and  connecting  rod  bearing  journal surfaces   of   the   crankshaft   are   hardened   to   a   minimum depth   of   approximately   0.060   inch.   If   regrinding   of crankshaft  journals  becomes  necessary,  the  work should  be  done  by  a  reputable  machine  shop  that  has suitable  equipment  to  handle  precision  work  of  this type.  Main  bearing  shells  0.002,  0.010,  0.020  and 0.040  inch  undersize  are  available.  If  crankshaft  is ground,   the   diameter   of   main   bearing   journals   should be   reduced   in   steps   of   0.002,   0.010,   0.020,   or   0.040 inch  below  3.2465  to  3.248  inches  to  fit  the  undersize main   bearing   shells. (4)   If   out-of-round   or   taper   of   journals   exceeds 0.002   inch,   crankshaft   must   be   reground   to   a   standard undersize   or   replaced. (5)  Blow  out  all  oil  passages  in  crankshaft  with dry   compressed   air. (6)   Any   bearing   shells   that   are   scored,   chipped, pitted,  or  worn  beyond  the  specified  limits  given  below must   be   replaced. Inspect  backs  of  the  shells  for bright   spots. Bright  spots  on  backs  of  the  shells  indi- cate  shells  have  shifted  in  their  supports  and  are  unfit for   further   use. (7)   The   clearance   between   main   bearing   shells and  the  crankshaft  journals  is  0.  0019  to  0.  0046  inch. New   bearing   shells   must   be   installed   when   this   clear- ante  exceeds  0.  008  inch. (8)  With  crankshaft  removed,  measure  inside diameter  of  the  bearing  at  a  point  90°  from  the  parting line,  with  bearing  cap  installed  and  tightened  to  170- 190 foot-pounds. Bearing   shells   when   in   place   are 0.  002  to  0.  004  inch  larger  in  diameter  at  the  parting line  than  they  are  90°  from  the  parting  line,  and  do not   form   a   true   circle.   The   two   halves   of   the   shells have  a  crush  fit  in  their  bore  in  the  block  and  must  be tight  when  the  cap  is  secured  in  place.  Do  not  measure inside   diameter   at   the   parting   line. (9)  The  bore  of  new  main  bearings  installed  is 3.2499  to  3.2511  inches  and  any  reading  above  3.2511 inches   indicates   the   amount   of   bearing   wear. Measure diameter   of   the   crankshaft   journal   at   the   corresponding bearing   location   and   subtract   this   dimension   from   in- side   diameter   measurement   of   the   bearing   (as   deter- mined  above);  the  difference  between  these  two  meas- urements   is   the   crankshaft-to-bearing   clearance. (10)   Another   method   for   determining   amount   of wear  on  bearing  shells  is  by  measuring  each  shell  with a  micrometer  at  a  point  of  90°  from  the  parting  line. New   (standard   size)   shells,   should   measure   0.   1549-   to 0.   1554-inch   thick.   Bearing   shells   less   than   0.   153- inch  thick  are  worn  beyond  the  allowable  limits  and must   be   replaced. (11)   The   most   accurate   method   of   determining main   bearing   clearance   is   by   using   micrometer,   as described   i   n   the   preceding   paragraphs.   However,   if the   proper   size   micrometers   are   not   available   or   the crankshaft   is   installed   in   the   engine,   bearing   clearance must   be   measured   by   using   a   plastic   strip   manufac- tured   for   this   purpose. The   plastic   strip   must   be   used in   accordance   with   the   manufacturer’s   instructions. b.   Cylinder   Block   and   Cylinder   Sleeves. (1)  Thoroughly  clean  the  bores  in  cylinder  block for   the   sleeve.   Make   certain   bottom   surface   of   flange on   cylinder   sleeve   and   the   counterbore   in   cylinder block   are   clean   and   free   from   nicks   or   burrs. (2)   Before   installing   the   new   sleeves,   use   warm water  and  common  laundry  detergent  and  scrub  the  bore with   a   stiff   bristled   brush   to   insure   cleanliness   and   re- moval  of  any  possible  hone  dust  from  the  pores.  Dry and  protect  with  a  thin  coating  of  engine  lubricating oil . (3)   Before   installing   packing   rings   on   sleeve,   in- sert  sleeve  into  bore  of  cylinder  block  to  make  sure sleeve  can  be  pushed  down  into  place  and  turned  in  the bore   by   hand   pressure. If  the  sleeve  cannot  be  inserted and   turned   in   the   above   manner,   more   cleaning   is   nec- essary. (4)  Rotate  the  sleeve  with  the  contact  point  of  the dial   indicator,   contacting   the   bottom   of   the   counterbore. Total  indicator  reading  should  not  exceed  0.  002  inch. If   the   total   dial   indicator   reading   exceeds   the   specified limit,   reworking   of   the   counterbore   is   necessary. (5)   The   protrusion   (standout)   of   the   cylinder sleeve  flange  above  the  top  flat  surface  of  the  cylinder 14-93