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TM9-2815-202-34 6-34.  PISTON  AND  CONNECTING  ROD  MAINTENANCE (3) Connecting Rod (TRUNK  TYPE)  (Cont) (a) (b) Check  connecting  rod  for  visual  damage.  Scrap  rod  if  bent,  had  previous  bearing  failure, was overheated (blued) at top or bottom end, or fretted at split line between rod and cap. Check for cracks by the magnetic particle method. NOTE Overheated  bushings  may  become  loose  and  creep  together,  thus  blocking  off  supply of lubricating oil to piston pin and spray nozzle. (c) Check connecting rod bushings for indications of scoring, overheating, or other damage. Compressed  air  used  for  cleaning  purposes  will  not  exceed  30  PSI.  Use only  with  effective  chip  guarding  and  personal  protective  equipment (goggles/shield,  gloves,  etc). (d) Check spray nozzle at upper end of connecting rod for plugged holes. Blow compressed air through drilled oil passage in rod to insure spray nozzle holes are open. (e) Inspect connecting rod bearing bores for burrs or foreign particles. Clean up minor burrs with  crocus  cloth  using  circular  motion. 6-34


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