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Engine bearings today are operating under very harsh conditions. Consequently, a wear propagates for a short time and a fatigue sometimes occurs on the bearings. In present study, on the rig test machine, the operating conditions of engine bearing were simulated to reproduce the bearing damage. The bearing wear was measured until the fatigue crack occurred. The bearing wear increased at the edges of the bearing length and the crack also was observed near the edges. The experimental results were compared to the calculated results based on the elastohydrodynamic lubrication (EHL) theory. The correlations between the bearing damage and the bearing performances by the theoretical analysis were investigated.

Tests have been carried out to investigate the influence of parameters such as bearing clearance and oil grooving on the temperatures of crankshaft bearings in an automotive engine. Measurements were made in all main bearings and in one connecting rod bearing via a telemetry linkage. All bearing temperatures were found to be very dependant upon oil gallery temperature. Reducing the bearing clearances resulted in increased temperatures in those bearings. Using fully grooved main bearings, in place of partially grooved, produced much higher main bearing temperatures. Reducing the width of the connecting rod bearings resulted in a reduction in their temperatures.