Plain bearing failure index

2.0 Wear

Wear Index


2.5 Erosion damage to axial oil groove in journal bearing

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	Erosion damage to inlet oil groove caused by particles in oil too large to enter the oil film.
Main Characteristics	Edges of oil groove have been eroded away by particles trapped in oil groove as they were too large to enter bearing oil film.
Cause	Oil contamination. See wear summary for further information on causes and actions.
Note	Axial oil grooves should have dirt escape gutters cut at 45° at ends of groove. These gutters should be deep enough to discharge the dirt particles, but not so deep that they cause excessive sideways drainage of oil from the groove.
Possible Confusion with Other Types of Damage	None
Comment	This damage indicates inadequate filtration of the oil and poor bearing design.