PISTONS - RINGS - RODS Assembly TABLE NO. 3 PISTON PIN REJECTION SIZE BASIC MODEL SERIES PISTON PIN PIN BORE ALUMINUM CYLINDER Inch Mm Inch Mm 6B, 60000 .489 12.42 .491 12.47 8B, 80000 .489 12.42 .491 12.47 82000, 92000, 110000 .489 12.42 .491 12.47 100000 .552 14.02 .554 14.07 130000 .489 12.42 .491 12.47 140000, 170000, 190000 .671 17.04 .673 17.09 220000, 250000 .799 20.29 .801 20.35 CAST IRON CYLINDER Inch Mm Inch Mm 5, 6, 8, N .489 12.42 .491 12.47 9 .561 14.25 .563 14.30 14, 19, 190000 .671 17.04 .673 17.09 200000 .671 17.04 .673 17.09 23, 230000 .734 8.64 .736 18.69 240000 .671 17.04 .673 17.09 300000, 320000 .799 20.29 .801 20.35 Assemble Piston and Connecting Rod The piston pin is a push fit in both piston and connecting rod.  On models using a solid piston pin, one end is flat, the  other  end  is  recessed.    Other  models  use  a  hollow pin. Place a pin lock in the groove at one side of the piston. From  the  opposite  side  of  the  piston,  insert  the  piston pin,  flat  end  first  with  solid  pin,  either  end  with  hollow pins, until it stops against the pin lock.  Fig. 3.  Use a thin nose pliers to assemble the pin lock in the recessed end of  the  piston.    Be  sure  the  locks  are  firmly  set  in  the grooves. Assemble Rings to Piston In  Fig.  7,  are  shown  the  various  rings  and  the  proper position of each.  Note especially the center compression ring.  The scraper groove should always be down toward the  piston  skirt.    Be  sure  the  oil  return  holes  are  clean and carbon is removed from all grooves.  NOTE:  Install expander under oil ring, when required. Fig. 7.  Position of Rings Oil  the  rings  and  piston  skirt,  then  compress  rings  with ring compressor (part 19070 or 19230).  On all cast iron models,  use  ring  compressor  (19070)  as  illustrated  in Fig.   8.   Illustration   1.      On   all   aluminum   engines,   use compressor (19070) as illustrated in Fig. 8. Illustration 2. NOTE:    When  using  19230  (2  band)  ring  compressor, use as shown in Fig. 8, Illus. 1 on all engines. Fig. 8.  Compression Rings Turn   the   piston   and   compressor   upside   down   on   the bench and push downward, so the piston head and edge of    compressor    band    are    even    while    tightening    the compressor.      Draw   the   compressor   up   tight   to   fully compress  the  rings,  then  loosen  the  compressor  very slightly.        Do    not    attempt    to    install    piston    and    ring assembly without ring compressor. NOTE:    The  pistons  used  in  the  220000  and  250000 engines  have  a  notch  as  shown  in  Fig.  9.    The  notch must    face    the    flywheel    side    of    the    cylinder    when installed. Installing Piston and Connecting Rod Models 300000 and 320000 The piston has an identification mark "F" located next to piston    pin    bore.        When    assembling    piston    to    the connecting rod, the letter "F" on the piston must  appear on    the    same    side    as    the    assembly    mark    on    the connecting  rod.    Assembly  mark  on  rod  is  also  used  to identify  rod  and  cap  alignment.    Install  piston  rings  as illustrated in Fig. 9. Fig. 9.  Assemble Piston to Rod 3