ARMY TM 9-2815-260-24
AIR FORCE TO 38G1-126-2
MARINE CORPS TM 09244A/09245A-24
Visually inspect cylinder liner (11) as follows:
Inspect cylinder liner outer diameter (11) for pitting and erosion as follows:
If liner pitting has occurred, check condition of coolant.
Refer to Figure 5-78. Inspect exterior length of liner for pitting (A). Check
packing step for erosion (B). If pitting or erosion is observed, measure depth of
pits with a fine wire or needle. Replace piston liner if depth of any pit is one-
half or more of liner thickness (C) or depth of erosion is one-half or more of the
packing step (D).
Refer to Table 5-10 for cylinder liner specifications.
Measure cylinder liner thickness at several points. Refer to Table 5-10 for specifications.
Replace piston and cylinder liner if out of specifications.
Measure packing step dimension at several points. Refer to Table 5-10 for specifications.
Inspect cylinder liner inner diameter for crosshatch honing pattern. Replace piston and
cylinder liner if crosshatch honing pattern is not visible immediately below top ring turn-
Inspect cylinder liner inner diameter for pitting or deep vertical scratches that can be
detected by the fingernail. Replace piston and liner if pitting or deep vertical scratches
Carefully examine cylinder liner under magnification for signs of fatigue such as fine
cracks in the flange area and cracks in the ring travel area. Replace piston and cylinder
liner if signs of fatigue are observed.
FIGURE 5-78. INSPECTING CYLINDER LINER PITTING