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Typical Main engine bearing failures

Typical bearing failures 
fatigue failure,
tin oxide encrustation,
wiping damage,
tearing of overlay,

acidic corrosion,
cavitation erosion(cavitation : vapourisation due to oil pressure falling below vapourisation goes to high pressure region and collapses causing heavy impingement Causes: High temperature, low pressur, contamination, vibration ) ,
dross inclusion,
spark erosion,
bacterial action(honey coloured deposits)
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