ARMY TM 9-2815-254-24
AIR FORCE TO 38G1-94-2
Remove dowel pins and fittings only if necessary.
Letters and numbers are stamped on top face of block at each cylinder
Letters (A or C) represent grade of piston installed during
production. Numbers (1, 2, 3, or 4) represent grade of cylinder liner
installed during production. However. when ordering a new cylinder liner
for service repair either a No. 2 or No. 3 grade cylinder liner will be
supplied. Either one may be used to replace whatever grade liner was
used in production.
Check cylinder block upper face warpage as follows.
If not removed, remove dowel pin.
Remove cylinder liner, refer to paragraph 3-32.1 step h.
Using a straight edge and a feeler gage, measure the four sides and two diagonals of cylinder
block upper face, refer to FIGURE 3-112.
Standard warpage is 0.002 in. (0.05 mm) or less. If measured value exceeds 0.008 in. (0.2
mm) but is less than 0.016 in. (0.4 mm), regrind the cylinder block. If measured value is
greater than 0.006 in. (0.14 mm), replace cylinder block.