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ARMY TM 9-2815-255-24 AIR FORCE TO 38G1-95-2 MARINE CORPS TM 2815-24/4 NOTE Replacement bearing caps are supplied with bearing bore unfinished. g. Inspect piston cooling orifices as follows: (1) Inspect each cooling orifice to make sure it is not plugged or damaged. (2) Use a soft wire and compressed air to clean orifice.  Replace, if condition is questionable. CAUTION A  piston  cooling  orifice  failure  could  cause  damage  to  pistons,  piston  pins,  rod  pin  bushings, and liners.  If a piston cooling orifice Is left out of block during assembly, low or no oil pressure will result. (3) Install all the orifices and tighten to 84 in-lbs (10 Nm). 3-44.3.  Repair. If crankshaft is to be reground, use following recommended guidelines. CAUTION Crankshaft  grinding  should  be  done  only  by  experienced  personnel  on  equipment  capable  of maintaining crankshaft size and finish specifications. CAUTION If undersize bearings are used, check bearing clearance after bearing caps have been tightened to specified torque.  If undersize bearings are too tight and clearance Is not within specifications, Journal and bearing will be wiped clean of all oil.  This would result in premature wear of parts. CAUTION When grinding crankshaft, also grind fillet radii to specifications.  This is necessary to prevent stress risers in fillet areas during grinding. NOTE  In  addition  to  standard  size  main  and  connecting  rod  bearings,  0.002,  0.010,  0.020,  and 0.030 inch (0.05, 0.25, 0.51, and 0.76 mm) undersize bearings are available. NOTE The  0.002  inch  (0.05  mm)  undersize  bearings  are  used  normally  to  compensate  for  slight  even wear on crankshafts.  Regrinding is usually unnecessary when this size bearing is used. 3-179


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