I was a submarine electrician and we changed out bearings because they all had resistance temperature detectors that were wired. High speed steam turbines had journal and thrust bearings, and motors had ball bearings. Wiped bearings were very rare, but many hours of work to replace. Submarines had two turbines driving one reduction gear so we'd have to disconnect the turbine with the bad bearing to restore propulsion. No roller bearings, they were too noisy.
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