Abstract
This analysis aims to determine the severest engine operating condition for deterioration of oil film lubrication around the crankpin journal, and to clarify the reason why minimum oil film thickness (M. O. F. T.) occurs during engine operation. As a result, that operating condition is experimentally found to raise the surface temperature of the crankpin at 7400 rpm and no/load or deceleration. According to the narrow bearing theory for dynamic loading, a decrease in M. O. F. T. is caused by the following factors: the first is a deformation of the connecting rod and crankshaft, the second is an increase in oil temperature and the third is an increase in the weight of reciprocating moving parts.
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