Plain Bearing Failure - Wear - Scoring of lead-bronze journal bearing

PLAIN BEARING FAILURE

Plain bearing failure index

2.0 Wear

2.3 Scoring of lead-bronze journal bearing

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	Gross scoring damage to lead-bronze journal bearing.
Main Characteristics	Deep circumferential scoring of bearing surface in the direction of rotation.
Cause	Gross contamination of lubricating oil. See wear summary for further information on causes and actions.
Note	Note the continuous score marks and the dragging over of the bearing metal at the downstream end of the half bearing (right hand side in Photograph).
Possible Confusion with Other Types of Damage	Unlikely to confuse with other failure mechanisms.
Comment	This was a main bearing of a three-throw reciprocating pump. The damage occurred at commissioning because the crankcase was not cleaned out before starting.