Check main bearing bore alinement.

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Check main bearing bore diameter.

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TM-9-2815-226-34-1 Engine Diesel 6 Cylinder Inline Turbocharged Cummins NTC-400 BC2 Manual

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Check main bearing bore alinement. (cont)

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.

NOTE

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