Quantcast REPAIR  -  CONTINUED - TM-5-2815-241-34P_254

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TM  5-2815-241-34&P PISTON AND CONNECTING ROD - CONTINUED ACTION LOCATION ITEM REMARKS REPAIR  -  CONTINUED NOTE Perform  steps  38  thru  41  for  connecting  rods  tagged  for  crankpin  bore  resizing. 38. Connecting  rod  (1) a. Make  sure  bearing  cap  (2)  is  torqued correctly. See  step  11. b. Using  ST-870  mandrel  and  block,  push out old piston pin bushing (3). c. Using   ST-561   connecting   rod   checking fixture,  recheck  connecting  rod  length. If  connecting  rod  length  is  11.991 inch  (304.57  mm)  or  less,  connect. ing  rod  cannot  be  resized.  Discard. d. Using  1/2-inch  drive  15/16-inch  socket and hinged handle, unscrew and take off two  nuts  (4),  two  bolts  (5),  two  washers (6), and bearing cap (2). NOTE The maximum amount of material that can be ground and lapped off connecting rod and bearing  cap  mating  surfaces,  can  be  determined  by  subtracting  11.991  inch  (304.57 mm) from the actual length of the connecting rod to be repaired, as measured using the ST-561  connecting  rod  checking  fixture. During  grinding  and  lapping  operation,  parts  must  be  clamped  securely  to  ensure proper contact of entire mating surfaces and proper alinement of bolt bores when assembled.  Boltholes  must  remain  perpendicular  to  machined  mating  surfaces. e. Using  surface  plate  and  cutting  fluid, lap  connecting  rod,  bearing  cap  (2), and  mating  surfaces  (7). f. Using  prussian  blue,  check  seating  of mating  surfaces  (7). Seating  pattern  must  show  a  minimum of  75  percent  contact. Seating  pattern  in  area  outside  bolt center  line  (area  farthest  from  crank- pin  bore  center  line)  must  indicate 100  percent  seating. 2-232


 


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