TM5-6115-585-34 NAVFAC    P-8-262-12 TO-35C2-3-455-2 TM-05684C-34 If  pin  is  excessively  loose,  install  a  new  piston  and pin  assembly. NOTE Piston  and  pins  are  matched  sets  and  are  not procured    separately. (3)  Rings.  Place  each  piston  ring  into  its  cylinder bore   and   using   a   feeler   gauge   measure   gap   dimen- sions.  Gap  is  shown  in  Table  l-2  If  gap  is  under  0.010 inch,   file (a) (b) (c) as   follows: Place  file  in  vise. Grasp piston ring in both hands. Insert file into ring gap and move ring down the  entire  length  of  file.  Be  sure-to  apply  equal-pres- sure  on  the  ring. (4)  Connecting  Rods  (see  figure  7-17).  Clean  con- necting  rods  and  check  each  for  defects.  Check  con- necting  rod  bushings  for  proper  clearance  with  piston pin.  Clearance  is  given  in  Table  1-2.  If  bushings  (13, figure  7-14)  are  excessively  worn,  press  them  out  and install   one   new   bushing   from   each   side   of   bushing bore.  Press  new  bushings  only  until  flush  with  sides of  rod  to  leave  1/16  to  7/64  inch  oil  groove  in  center. Ream   bushing   I.D.   to   obtain   the   proper   clearance. Check   bore   in   connecting   rod.   Bore   must   be   open. Check  connecting  rod  alignment  on  a  standard  align- (5)  Connecting  Rod  Bearings  (see  figure  7-  17). Inspect  connecting  rod  bearings  for  burrs,  breaks, pits   and   wear.   Measure   clearance   between   bearings and  crankshaft  journal.  See  Table  1-2  for  clearance.  If necessary,   replace   with   new   standard   or   undersize precision   bearings. e.   Assembly   (see   figure   7-14). NOTE The  piston  witness  mark  (notch)  must  face front  of  engine  and  rod  witness  marks  (num- bers)   must   face   toward   camshaft   side   of   en- gine. (1)  Install  connecting  rods  (12,  figure  7-  14)  on each  piston  (7)  with  pins  (6)  and  retaining  rings  (5). If  new  bushings  (13)  were  installed,  check  to  see  that ends  are  flush  with  the  connecting  rod  (12)  to  provide for  oil  recess  in  the  center. (2)  Install  rings  and  oil  ring  expander  (1,  2,3  and 4)   on   each   piston   (7).   Compression   rings   will   be marked  TOP  or  identified  in  some  other  manner. Place   this   mark   toward   the   closed   end   of   piston. Space  ring  gaps  1/4  of  the  way  around  piston  from one another. No gap should be in line with piston pin. Oil the rings (1, 2 and 4) and pistons (7). NOTE ment   fixture. When  installing  old  bearings  make  sure  they are  installed  in  the  same  position  they  were removed   from. Figure  7-17.  Connecting  Rod  and  Bushings (3)  Position  a  bearing  half  (11)  in  connecting  rod (12) and cap (10). Be sure there is no dirt under bear- ing.   This   could   cause   high   spots   and   early   bearing failure. f.   Install, (1)  Hone  cylinder  walls.  Clean  and  oil  the  cylin- der  walls.  Install  each  piston  in  proper  cylinder  using a  suitable  installer.  Each  piston  assembly  should  be installed  with  notch  on  piston  toward  front  of  engine. The  notch  on  the  circumference  of  the  closed  end  of the  piston  should  be  located  closest  to  front  of  engine. (2)   Position   each   connecting   rod   on   crankshaft and  oil  the  journal  and  install  rod  cap  with  bearing half.  When  installing  rod  cap,  position  so  raised  wit- ness  mark  on  the  forging  matches  the  mark  on  con- necting   rod.   See   figures   7-17   and   7-18.   The   piston witness  mark  should  face  front  and  rod  witness  marks toward  camshaft  side  of  engine. (3)   Tighten   capscrews   to   specified   torque.   See table  1-1. (4)  Turn  engine  over  by  hand  to  see  that  all bearings   are   free. 7-18