Info Centre >> Fuel and Lube Oil Technical Manual >> 7. Lube Oil - Test Results >> 7.9 Directory of Bearing Failures >> Overload
1 - long term overload and resultant axial fatigue damage of a small end bush.
2 - thermal facetting of a white metal thrust pad (caused by severe alternate heating and cooling resulting in grain growth)
3 - fatigue damage due to interference between the bearing tang and the housing. The bearing was held away from the housing thus badly supported allowing it to flex.
4 - fatigue of the bearing overlay
5 - localised fatigue on a poorly supported bearing (design fault).
6 - central bore wiping caused by a differentially worn bearing journal. Typically only happens when new bearings are fitted as old bearings have worn with the journal.
7 - severely overloaded ball bearing pin showing plastic deformation, fatigue and scoring.
8 - fatigue damage to a roller bearing pin, less severe than 7.