TM 5-4320-300-146-7. CYLINDER HEAD AND BLOCK (CONT)Location/ItemActionRemarksREPAIR/REPLACEMENTOF CYLINDER BLOCK64. Cylinder blockReplace if:Block shows cracks or leaks of any type duringthe pressure test.Seal rings or grooves are seriously pitted orcorroded.Cylinder bores exceed 4.5235 inches(114.897 mm) at position A.Cylinder bores exceed 4.490 inches(114.046 mm) at position B.Cylinder bores exceed 4.3595 inches(110.731 mm) at positions C and D.Block leaks, even if bore dimensions are belowthe maximum.Bore taper or out-of-round dimension exceeds0.0015 inch (0.0381 mm).Top varies more than 0.003 inch(0.0762 mm) transversely, or 0.006 inch(0.1524 mm) longitudinally.Cylinder liner counterbore dimension depthis not within 0.300 to 0.302 inch (7.620 to7.67 mm).There is more than 0.001 inch (0.0255 mm)difference between any two adjacent cylindercounterbores when measured along the cyl-inder longitudinal centerline.Main bearing bores are outside of the 3.251 to3.252 inch (82.57 to 82.601 mm) range.Crankshaft cannot be turned freely by handIf the crankshaft can-after installing new bearing shells, and installingnot be rotated bythe bearing caps, bolts, and tightening them tohand, an out ofthe specified torque.alinement conditionexists between theBlock has seriously corroded or rusty machinedmain bearing bores.surfaces.65. Cylinder blockClean and retap, or use threaded inserts in,threaded holesany damaged threaded hole in the engineblock.6-45
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