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TM9-2815-202-34 4-33.   PISTON   AND   CONNECTING   ROD   MAINTENANCE   (CROSS-HEAD)   (Cent) (3) Connecting Rod (a) Check connecting rod for visual damage. Scrap rod if it is bent, had previous bearing l failure.  was  overheated  {blue) at to~ or bottom end, is fretted at split line between rod and cap, or has excessive pound-in of bolt head or nut. (b)  Check  for  cracks  by  magnetic  particle  method. (gqjgg&!.,,.,.. RODS WITH INDICATIONS OVER  .DD5  DEEP SECTION    A-A VIEW   A - A / =qg WA EXAMPLE   OF   A   TRANSVERSE   INDICATION EXAMPLE   OF   AN   INDICATION THAT   DOES   NOT   FOLLOW   LONGITUDINAL FOLLOWING LONGITUDINAL FORGING  FLOW  LINES  CAN  SE  EITHER  A FORGING   FLOW   LINES. FORGING  LAP,  HEAT  TREAT  CRACK,  OR START  OF  A  FATIGUE  CRACK. * VIEW   A ~—Not+.i3,T,cALAREA-+ CRITICAL    AREA ACCEPTABLE   LIMITS + INDICATIONS   IN   NON-CRITICAL   AREAS ARE  ACCEPTABLE  UNLESS  THEY  CAN   BE OBSERVED   AS   OBVIOUS   CRACKS WITHOUT    MAGNETIC    INSPECTION. LONGITUDINAL INDICATIONS TRANSVERSE    INDICATIONS    (ACROSS    FLOW    LINES). GRINDING    NOTES FOLLOWING   FORGED   FLOW   LINES   ARE HAVING  A  MAXIMUM  LENGTH  OF   1/2,   WHICH  CAN  BE uSUALLY  SEAMS  AND  ARE  NOT CARE  SHOULD  BE  TAKEN  IN  GRINDING REMOVED  BY  GRINDING  NO  DEEPER  THAN   1/64.  ARE CONSIDERED   HARMFUL   IF   LESS   THAN oUT   INDICATIONS   TO   ASSURE   PROPER ACCEPTABLE    AFTER    THEIR    COMPLETE    REMOVAL 1/32   DEEP   DEPTH   CAN   BE   DETERMINED BLENDING  OF  GROUND  AREA  INTO AN  EXCEPTION  TO  THIS  ISA  ROD  HAVING  AN BY  GRINDING  A  SMALL  AREA  NEAR  THE UNGROUND  SURFACE SO AS TO FORMA INDICATION  WHICH  EXTENDS  OVER  THE  EDGE  OF   W CENTER   OF   THE   INDICATION. SM~TH  CONTOUR. SECTION  AND  IS  PRESENT  ON  BOTH  SIDES  OF  THE FLANGE.   IN   THIS   CASE,   MAXIMUM   ALLOWABLE ~~ DEPTH  IS  .005  (SEE  SECTION  A-A). POOR    PRACTICE GOOD    PRACTICE (c) Inspect connecting rod bearing bores for burrs or foreign particles.  Clean  up  minor  burrs with  crocus  cloth  using  circular motion. (d) If new connecting rod is required, stamp  cylinder  number  on connecting rod (5) and cap (3). (4) Connecting  Rod  Bearings (a) (b) Inspect  bearing  shells  for  scoring, pitting,  flaking,  etching,  and  dirt grooving. If any of these defects are  present,  discard  bearing shells. Discard bearing shells with bright spots  on  backs  indicating movement  in  bearing  caps  or supports. 5 3 4-136


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