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TABLE 4-2 TM   9-2815-202-34 NOTE If one bearing shell is less than minimum thickness shown in Table 4-2, replace both bearing  shells  (upper  and  lower). (c)  Using  a  micrometer  and  ball  attachment,  measure  thickness  of  bearing  shells  (4)  at point   "C",   90   degrees   from   parting   line. (1) l l (2) (3) Using  micrometer,  measure  piston BEARING   SHELL   CONNECTING   ROD   THICKNESS skirt  outside  diameter  parallel  and BEARING *NEW    BEARING MINIMUM    WORN perpendicular  to  piston  pin  bore, SIZE THICKNESS THICKNESS obtain  measurements  at  room STANDARD .1240"/.1245" .1230" temperature   (70°F-21°C).   Diameter .002”    UNDERSIZE .1250'/.1255' .1240' must be 4.2428 to 4.2450 inches .010”    UNDERSIZE .1290'/.1295' ,1280” (Diameter  above  and  below  pin  bore .020"    UNDERSIZE .1340'/.1345" .1330” may be 4.2414 inches). .030”   UNDERSIZE .1390"/.1395" .1380” ‘Thickness  90°  from  parting  line  of  bearing. NOTE Use feeler gage to check piston skirt to liner clearance. Use a spring scale attached to feeler gage to measure amount of force in pounds required to withdraw feeler gage  from  between  piston  and  liner.  Select  feeler  gage  with  thickness  that  will require six pounds pull to move. Piston to liner clearance will be 0.001 inch greater than thickness of feeler gage used. For example, a 0.004 inch feeler gage indicates 0.005  inch  clearance  when  withdrawn  with  a  six  pound  pull. Feeler gage must be perfectly flat and free of nicks and bends. With cylinder liner (1) installed in cylinder block, hold piston skirt (14) upside  down  in  liner  and  check clearance  in  four  places  90  degrees apart. Clearance must be 0.0045 to 0.0083  inch  with  new  parts.  Maximum clearance  of  0.012  inch  is  allowed  for used parts. If binding occurs between piston and liner,  remove  piston  and  examine piston and liner for burrs. Remove burrs with fine flat hone and recheck clearance. Change 1 4 - 1 37


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