Prelube Pumps Extend Equipment Life According to ESE, pre-lubing before every start is an inexpensive way to extend the life of engine-driven equipment. When an engine is running, the engine's oil pump supplies pressurised oil into the centre of the bearings to create a cushion that separates the bearing surface from the crankshaft. Once the engine is running, the surfaces never touch because they ride on this film of oil. As soon as the engine shuts down, however, the oil that comprises the cushion begins to drain away and the film thins. After only a few seconds, the film thins to the point that 'metal-to-metal' contact can begin to occur. In other words, the cushion is gone and the crankshaft is resting directly on the bearing. Pre-lubing the engine before every start can extend engine life by eliminating metal-to-metal contact during the first several seconds of running. Those few seconds after cranking the engine can be suspenseful for the operator as the oil press...
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