Quantcast FIGURE 3-135.  Checking Piston Pin Bushing

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ARMY TM 9-2815-255-24 AIR FORCE TO 38G1-95-2 MARINE CORPS TM 2815-24/4 (5) Initially tighten capscrews to 41 ft-lb (56 Nm).  Tighten  screws an additional 90 to 100 degrees, refer to paragraph 3-50.3.i for Torque-Turn Method for proper torque. (6) Using an inside micrometer, measure rod bore at center of bore and record measurements as follows: (a) At right angle to rod/cap joint. (b) At 45 degrees left of measurement step (a). (c) At 45 degrees right of measurement step (a). (d) Rod bore ID should be 2.900 to 2.901 inches (73.66 to 73.69 mm). (7) Compare  measurements.    If  difference  between  greatest  and  least  measurement  is  more  than  0.0015 inch(0.038 mm), rod and cap are out of round.  Replace both connecting rod and cap. d. Inspect piston pins and bushings as follows: (1) Visually inspect piston pin for general overall condition.  Pin must be replaced if it shows signs of fretting. CAUTION Piston pin has a highly polished surface.  Do not attempt to polish or refinish. (2) Using outside micrometer, measure piston pin OD.  Replace if not within 1.624 to 1.62.5 inches (41.27 to 41.28 mm). (3) Inspect piston pin bushing for damage or excessive wear.  Lubrication hole must be open. (4) Compare pin bushing ID with pin OD for specified oil clearance. (5) Insert  pin  from  either  side  of  rod  bushing.    If  pin  is  free  on  one  end,  but  tight  on  other,  bore  could  be tapered (A, FIGURE 3-135).  If pin, enters freely from both sides, but is tight in center, bore is bell mouthed (B).  Pin-to-bushing  clearance  should  be  0.0008  to  0.0024  inch  (0.02  to  0.06  mm),  with  a  maximum  of 0.004 inch (0.10 mm). FIGURE 3-135.  Checking Piston Pin Bushing e. Replace connecting rod bushing. (1) Using driver (JD-286), remove connecting rod bushing (12, FIGURE 3-124). (2) Clean bore of rod with medium grit polishing cloth. (3) Inspect rod bore for cracks.  Ensure lube oil hole is open. NOTE If bushing has spun or it rod bore diameter is not within specifications, replace connecting rod. 3-196


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