d.   Using   an   inside   micrometer,   measure   the   bore of   the   cylinder   sleeve. Using   an   outside   micrometer, measure   the   outer   diameter   of   the   piston   skirt   at   the right  angle  to  the  piston  pin  and  at  the  bottom  of  the skirt. The   difference   between   the   two   readings   is   the running   clearance. e. The  gap  between  ends  of  piston  rings  should  be measured   before   rings   are   installed   on   pistons. In- sufficient   end   gap   can   cause   scored   rings   and   scored cylinder    sleeves. Check  the  ring  gap  by  inserting each  ring  into  the  cylinder  sleeve  in  which  it  is  to  be used.  Use  a  piston  to  push  ring  squarely  down  in  the bore  of  the  cylinder  sleeve  and  far  enough  to  be  on  the ring   travel   area. Check  ring  gap  with  a  feeler The   ring   end   gaps,   using   cylinder   sleeves   of   4. 4.251   inches   bore   are: Top   compression   ring 0.013-0.027   inch Center   rings 0.013-0.024   inch Oil  control  ring  (3  pc.) 0. 013-0, 024 inch CAUTION The  piston  rings  should  never  be  filed  to open  the  gap  because  the  chrome  plating might  be  loosened  by  the  file  and  later distributed   through   the   engine   causing damage  or  scoring  of  the  piston  and  the cylinder   sleeve. gauge. 2495  - f.   Measure   ring-to-groove   clearance   (top   of   ring to   top   of   groove   in   piston).   The   ring   to   groove   clear- ances,   using   a   new   piston   and   new   rings,   are   as follows: Top   compression   ring 0.0040-0.0060   inch Center   rings 0.0020-0.0040    inch Oil  control  ring  (3  pc.) 0.0005-0.0030  inch g.   Install   one   of   the   piston   pin   retainers   in   one   end of  the  piston  pin  hole  in  the  piston. h.   Insert   upper   end   of   connecting   rod   into   piston. — CAUTION When   assembling   piston   to   connecting   rod, make  certain  top  of  piston  stamped  CAM  - SHAFT  SIDE  is  toward  side  of  connecting rod   stamped   with   numbers   identifying   the cap  with  upper  portion  of  rod. i. Lubricate  piston  pin  with  clean  0i1  and,  with  a piston   pin   remover   and   installer into  piston  and  connecting  rod. j.   Install   the   other   piston   pin posite  end  of  the  piston  pin  bore. NOT E After  piston  rings  have  been tool  tap  piston  pin retainer   at   the   op- properly   fitted, lubricate   piston   and   rings   with   engine   oil. Install  second  and  third  rings  on  piston  (with side   marked   "Top"   or   "T"  toward  top  of  piston) using   a   piston   ring   remover   and   installer   tool. Top   ring   may   be   installed   with   either   side toward   top. Install   each   piston,   with   rings   and   connecting   rods,   as an  assembly. The  lower  end  of  each  connecting  rod, as   well   as   the   connecting   rod   bearing   caps,   are   num- ber   1,   2,   3,   etc.   for   identification.   They   must   be installed   in   the   corresponding   numbered   cylinder   with the  numberedside  of  rod  toward  the  camshaft  side  of engine. k.   Stagger   piston   rings   gaps   180°   apart   and   in   line with  piston  pin  holes,    and  apply  clean  engine  oil  to pistons   and   rings. With   a   piston   ring   compressor (piston   inserted),   install   the   piston   and   connecting rod  in  the  cylinder  sleeve  by  pressing  on  top  of  pis- ton  with  wooden  hammer  handle. If  any  difficulty  is encountered,   however   slight,   the   piston   inserted   must be   removed   and   ring   set   inspected   for   correct   instal- lation   in   piston   grooves. Align  lower  end  of  connec- ting   rod   with   crankshaft   before   inserting   piston   into cylinder. 1.   Lubricate   and   install   a   bearing   shell   in   position in  connecting  rod,  with  tang  of  bearing  shell  in  the corresponding   slot   in   connecting   rod,   and   position   rod on   crankshaft   journal. CAUTION Make   certain   the   backs   of   the   bearing   shells are  free  from  dirt  and  grit  particles, m. Lubricate   and   install   a   bearing   shell   in   posi- tion  in  the  connecting  rod  bearing  cap,  with  tang  of bearing   shell   in   corresponding   slot   in   bearing   cap. Install   bearing   cap   and   shell,   making   certain   identi- fication   number   stamped   in   the   bearing   cap   is   located on   the   same   side   as   corresponding   number   stamped in  the  connecting  rod. n . Prior   to   installation,   thoroughly   clean   and   dry with   compressed   air   all   of   the   connecting   rod   cap- screws   (lock   bolts). o. Install  an  0i1  lubricated  piston  and  connecting assembly,   minus   bearing   cap   but   with   upper   bearing shell   in   place,   in   engine. NOT E Do  not  allow  the  rod  to  scratch  the  cylinder bore   nor   let   it   strike   the   crankshaft   webs   or thrust  faces  when  pushing  rod  into  place  on the   crankpin. p.   Check   rod   anti   cap   index   numbers   for   position anti   correctly   assemble   cap,   with   lower   bearing   shell in  place.   to  the  rod. q.   Generously   coat   the   capscrew   threads   and   their underhead   areas   with   engine   lubricating   oil. r. Install   connecting   rod   capscrews   and   tighten   to 8-12  foot  -pounds  torque,    (the   socket   head   capscrews require  a  male  3  8  inch  hex  wrench). s. Using  a  plastic  head  hammer  and  striking  the connecting  rod  cap  on  its  balance  pad  only,  align  the cap  to  the  rod  by  driving  it  first  against  the  crankpin forward  web  and  then  against  the  crankpin  rear  web. 14-91