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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