TM 10-3930-659-34 5-3. PISTON, CONNECTING ROD, AND CONNECTING ROD BEARING MAINTENANCE (Con’t). 11. Inspect  piston  pin  bushing  for  cracks,  breaks,  and  excessive  wear.  Using  inside  caliper  micrometer,  measure inside diameter of piston pin bushing. Inside diameter must be 1.626-1.627 in. (4.130-4.133 cm). 12. Inspect piston pin for cracks, bends, and breaks. Using outside caliper micrometer, measure outside diameter of piston pin. Outside diameter must be 0.624-0.625 in. (15.850-15.875 mm). 13. Subtract measurement taken in step 12 from measurement taken in step 11. Difference is piston pin-to-bushing clearance. Clearance must be 0.0008-0.0020 in. (0.0203-0.0508 mm). 14. Inspect  connecting  rod  for  cracks,  breaks,  and  damaged  threads.  Repair  damaged  threads  with  die  and  tap threading set. 15. Place connecting rod (9) in vise with jaw caps. 16. Apply  lubricating  oil  to  threads  of  two  bolts  (7). Install  main  bearing  cap  (8)  on  connecting  rod (9)  with  two  bolts.  Torque  bolts  to  55  Ib.-ft.  (75 N.m). 17. Using  inside  caliper  micrometer,  measure  bore diameter of connecting rod (9) and main bearing cap    (8).    Diameter    must    be    2.750-2.752    in. (6.985-6.990 cm). 18. Remove two bolts  (7)  and  main  bearing  cap  (8) from connecting rod (9). 19. Slide    upper    main    bearing    (12)    in    place    on connecting  rod  (9).  Ensure  that  tang  on  upper main bearing fits in locking groove on connecting rod. 20. Slide  lower  main  bearing  (11)  in  place  in  main bearing cap (8). Ensure that tang on lower main bearing  fits  in  locking  groove  on  main  bearing cap. 21. Apply  lubricating  oil  to  threads  of  two  bolts  (7). Install  main  bearing  cap  (8)  on  connecting  rod (9)  with  two  bolts.  Torque  bolts  to  55  Ib.-ft.  (75 N.m). 22. Using  inside  caliper  micrometer,  measure  bore diameter  of  lower  and  upper  main  bearings  (11 and    12).    Diameter    must    be    2.750-2.752    in. (6.985-6.990 cm). 23. Remove two bolts (7) and main bearing cap (8) from connecting rod (9). 24. Remove upper main bearing (12) from connecting rod (9) and lower main bearing (11) from main bearing cap (8). TA708141 5-28