TM 5-4320-300-14
6-7. CYLINDER HEAD AND BLOCK (CONT)
Location/Item
Action
Remarks
REPAIR/REPLACEMENT
OF CYLINDER BLOCK
64. Cylinder block
Replace if:
Block shows cracks or leaks of any type during
the pressure test.
Seal rings or grooves are seriously pitted or
corroded.
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 below
the maximum.
Bore taper or out-of-round dimension exceeds
0.0015 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 depth
is not within 0.300 to 0.302 inch (7.620 to
7.67 mm).
There is more than 0.001 inch (0.0255 mm)
difference between any two adjacent cylinder
counterbores when measured along the cyl-
inder longitudinal centerline.
Main bearing bores are outside of the 3.251 to
3.252 inch (82.57 to 82.601 mm) range.
Crankshaft cannot be turned freely by hand
If the crankshaft can-
after installing new bearing shells, and installing
not be rotated by
the bearing caps, bolts, and tightening them to
hand, an out of
the specified torque.
alinement condition
exists between the
Block has seriously corroded or rusty machined
main bearing bores.
surfaces.
65. Cylinder block
Clean and retap, or use threaded inserts in,
threaded holes
any damaged threaded hole in the engine
block.
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