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When the thickness of the film of lube oil in a hydrodynamic journal bearing is thinner than the size of particulate matter in the oil, the Babbitt bore and journal surface can be damage. The damage starts as individual grooves in the surface of the Babbitt bore and scratches in the surface of the journal. The grooves act as leak-off paths for the high pressure oil in the oil film and eventually increases the size and number of grooves, leading to performance degradation and eventual failure.
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Top 5 Problems that lead to Hydrodynamic Bearing Failure

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