Damage Caused by Faulty Assembly
Under this heading are included:
Fig. 6 Fretting between back of bearing and housing due to inadequate interference fit. Could also be due to flimsy housing design
Fig. 7 Overheating and fatigue at joint faces due to excessive interference fit causing bearing bore distortion. Could also be caused by joint face stagger on assembly or flimsy housing
Fig. 8 Fretting at joint faces of connection rod due to inadequate bolt tension.
Fig. 9 Uneven wear of overlay plated bearing due to misalignment.
Fig. 10 Fouling between shaft radius and end of bearing, causing overheating.
Fig. 11 Severe scoring of whitemetal-lined compressor bearing, due to wrong direction of shaft grinding.
Fig. 12 Back of tin aluminium bearing showing “flat” on steel shell caused by swarf entrapped between shell and housing.
Fig. 13 Bore of bearing shown in Fig. 12. Entrapped swarf has deformed bearing bore resulting in flexure and fatigue damage.
Fig. 14 Angular misalignment of shaft or housing, or dirt trapped behind carrier ring, causing damage to pads on one side only.
Investigate and if necessary
correct interference conditions
and housing design.
Scrap bearings and fit new
bearings or pads.