DAMAGE DUE TO OVERHEATING
Lining extrusion and cracking may be due to overheating with consequent reduction in strength of linings so that the material yields and cracks due to the effect of normal and shear forces transmitted through very thin oil films. Wiping does not necessarily occur under such conditions. Surface deformation can be caused in an anisotropic material by thermal cycling. 

TILTING PAD THRUST BEARINGS 
Fig. 39 - Cracking of whitemetal lining pad due to operation at excessively high temperatures. Note displacement of whitemetal over edge of pad due to extrusion. 

Fig. 40 - Cracking and displacement of whitemetal lining of pad due to overheating under steady load conditions.

Fig. 41 - Thermal “ratchetting” of whitemetal lining of pad due to thermal cycling through excessive temperature range in service.

RECOMMENDED ACTION 
Investigate and if possible reduce maximum operating temperatures. Fit new or reconditioned pads.