According to UK company Marine Sealing Systems, during the 1980s and 1990s, system oil contamination was a problem on the majority of two-stroke diesel engines.rnThis resulted from the gland box design and the inability of the original equipment manufacture (OEM) scraper/seal rings to prevent the under-piston detritus from finding its way into the engine sump; also the transmission of system oil through the housing, to end up being deposited in the under-piston area.
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