appears to be iron rust, corrosion and flaking are occurring in the system. If corrosion exists, or if othersolid contaminants are present in the lube oil, clean the system and purify the oil as soon as practical. Rustand bits of metal will scratch bearings and mar thrust shoes, especially in Kingsbury thrust bearings. A suddenincrease in bearing temperature, followed by a return to normal temperature, generally indicates that aforeign substance in the lube oil scratched the bearing and was then carried to the strainer basket.f. Shifting filtration. If the propulsion machinery has 40 or 25 micrometer (micron) duplex filters installed in thelubricating oil system, the daily strainer shifting and inspection requirement does not apply. Filters may notrequire shifting for several weeks, but should be shifted when the differential pressure exceeds the value recommendedby the filter manufacturer. Where class 6 (40 micron) or class 8 (25 micron) filter elements arespecified to Military Specification MIL-S-17849, the strainer housing should be designed to accept interchangeablythe specified filter elements or alternately the standard 80 mesh strainer baskets. A supply of temporary80 mesh strainer baskets and muslin and nylon bags should be stored in the vicinity of each duplexstrainer unit. The intent is to provide a safety net for the event of unusual lubricating oil system contamination,for situations of repair or overhaul, when a lubrication oil system flush is required.
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