Quantcast FIGURE 3-152.  Measuring Piston Skirt

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ARMY TM 9-2815-256-24 AIR FORCE TO 38G1-96-2 MARINE CORPS TM 2815-24/5 NOTE Inspect block for cracks or erosion in O-ring packing area.  Replace block if any of these defects are found. t. Measure piston skirt (A, FIGURE 3-152) 90 degrees to piston pin bore and 0.74 inch (19 mm) from bottom of piston (B).  Record measurement.  OD should be 4.188 to 4.189 inches (106.38 to 106.40 mm) FIGURE 3-152.  Measuring Piston Skirt u. Measure piston to liner clearance as follows: (1) Put piston (without rings) in matched liner with piston FRONT and liner FRONT aligned.  Move piston down until bottom edge of piston skirt is 1.00 inch (25.4 mm) above bottom of liner.  Refer to FIGURE 3-153 (1). (2) Use a feeler gage to measure distance (FIGURE 3-153 (2)) between piston skirt and liner 90 degrees to piston pin bore.  Record measured distance and compare with specifications given.  Clearance should be 0.003 to 0.006 inch (0.08 to 0.15 mm). (3) Turn piston 90 degrees in liner.  Use a feeler gage to measure distance between piston skirt and liner 90 degrees to piston pin bore.  Record measured distance and compare with specifications given. (4) The  difference  between  the  two  measurements  in  steps  (2)  and  (3)  is  distance  liner  is  out  of  round  at bottom. (5) Remove piston from liner.  Put piston in liner upside down with piston FRONT and liner FRONT aligned. Move piston so bottom edge of piston skirt is 1.00 inch (25.4 mm) (1) below top of liner.  Use a feeler gage to  measure  clearance  (2)  between  piston  skirt  and  liner  at  90  degrees  to  piston  pin  bore.    Record  the measured clearance. 3-200


 


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