Quantcast FIGURE 3-149.  Checking Piston Pin Clearance

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ARMY TM 9-2815-256-24 AIR FORCE TO 38G1-96-2 MARINE CORPS TM 2815-24/5 FIGURE 3-149.  Checking Piston Pin Clearance q. Check  piston  pin  and  piston  bore  specifications.    If  either  are  not  within  specification,  replace  pin  and/or piston/liner set. (1) Piston large pin OD should be 1.624 to 1.625 inches (41.27 to 41.28 mm). (2) Piston pin OD wear tolerance is 0.005 inch (0.13 mm). (3) Piston bore for large pin should be 1.625 to 1.626 inches (41.28 to 41.30 mm). NOTE Some  piston  pin  bores  are  elliptical,  the  width  being  0.0015  inch  (0.038  mm)  larger  than  the  bore specifications. r. Inspect exterior length of liner for pitting (A, FIGURE 3-150).  Check packing step for erosion (B).  If pitting or erosion is observed, measure depth of pits and erosion with a fine wire or needle.  Replace liner if (C) depth of any pit is one-half or more of liner thickness, or (D) depth of erosion is one-half or more of the packing step.  If no defects are found, proceed to next step. NOTE If pitting has occurred, check condition of coolant. NOTE Liners are reusable if depth of pits or erosion is less than amount specified.  When installing reusable liners,  rotate  90  degrees  from  original  position.    The  liners  should  be  deglazed  and  new  ring  sets installed on pistons, refer to paragraph 3-47.1. 3-198


 


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