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TM 9-2815-226-34-1
(3) Measure inside diameter of all bearing bores vertically, horizontally, and diagonally. Mark specific bores for
oversize boring if diameters exceed 4.7505 in. (120.6627 mm) or bore is out-of-round. Refer to para 3-9g
for boring procedures.
n. Check main bearing bore alinement.
ST-1177 is both a bore alinement checking tool and boring tool. Allow tool and
block to stabilize to room temperature before using.
(1) Remove no. 1 and no. 7 main bearing caps. If those caps are damaged, remove two undamaged caps
preferably one from each end of block or as far apart as possible.
3-68 Change 1


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