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ARMY TM 9-2815-254-24 AIR FORCE TO 38G1-94-2 (2) Standard cylinder liner bore is 3.386 in. (86.0 mm) with a limit of 3.394 in. (86.2 mm) If bore exceeds limit, replace cylinder liner. N O T E Inside  of  dry  type  cylinder  liner  is  chrome  plated  and  cannot  be  rebored. N O T E If inside of cylinder liner is scored or scorched, cylinder liner must be replaced. c. Check cylinder liner projection as follows: (1) Hold a straight edge along top edge of cylinder liner to be checked. (2) Using a feeler gage, measure each cylinder liner projection. (3) Standard projection is 0.0 to 0.004 in. (0.0 to 0.10 mm). (4)   The difference in projection height between any two adjacent cylinders must not exceed 0.0012 in. (0.03 mm). d. Select piston grade as follows: (1) The term grade refers to piston diameter and cylinder liner bore combination. (2)   Grade  ‘A’  piston  diameter  is  3.3804  to  3.3812  in.  (85.864  to  85.883  mm)  and  a  Grade  ‘C’  piston  diameter is 3.3813 to 3.3820 in. (85.884 to 85.903 mm). These diameters are measured with a micrometer, 2.05 in. (52 mm) from top of piston. (3) Cylinder liner bore and piston clearance is 0.0057 to 0.0077 in. (0.146 to 0.196 mm). 3-167


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