1987-1993 Mercury Mariner Outboards 70/75/80/90/100/115HP 3 and 4-cylinder Factory Service Manual, Page 147Get this manual

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Check Valves DESIGN (MODELS WITH CHECK VALVE ONLY) Located in crankcase cover under center main bearingsThese can be damaged by hot combustion blow-by into crankcaseTo Check: Look through holeif you s

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