Chamfer piston pin bore.

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Resize crankpin bore.

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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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Chamfer piston pin bore. (cont)

TM 9-2815-226-34-1

NOTE

Boring machine 3375115 is used to resize connecting rod bore and bore oversize

(thick wall) piston pin bushing (if required).

(12) Mount rod on boring machine.

Instruction book furnished with machine provides machine operating

procedures.

(13) Line bore crankpin bore to 3.3160 to 3.3165 in. (84.2264 to 84.2391 mm).

(14) Finished surface must be to 75 microfinish or better to ensure pr oper contact with connecting rod bearing

shells.

(15) Remove rod from machine.

c. Chamfer piston pin bore.

NOTE

ST-861 chamfering tool is only used on rods which do not have chamfers on piston

pin bushing bores. Piston pin bushing must be removed in order to chamfer bore.

(1) Place rod on ST-1242 block and secure rod in horizontal position.

(2) Place ST-861-4 special bushing into rod bore.

(3) Loosen two setscrews retaining tool bit to holder.

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