Engine System - Doosan D20G Service Manual

Engine System

Bearing, Connecting Rod
Diesel Engine
Normally, worn bearings can be detected by reduced
oil pressure, but if this wear goes undetected, the
excessive clearance will increase the impact between
the bearing and crankshaft, causing a distinct
knocking sound.
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A connecting rod noise occurs when the engine is not
loaded. Check by first applying a load, and then
unloading and listening for the noise.
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The connecting rod bearing shells are identified by
steel-stamped characters on the back of the bearings.
The characters indicate either standard (STD) or the
amount of oversize (OS).
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Use a barring tool to rotate the crankshaft to the
bottom dead center (BDC) position of the connecting
rod.
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95 Engine System