Mercury Mariner V-250 V-275 Outboard Service Shop Manual 1990, Page 119Get this manual

Mercury Mariner V-250 V-275 Outboard Service Shop Manual 1990, Page 119

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52 Remove 13 bolts from crankcase cover 54 Remove bolts from bottom end cap
56 Remove both rod cap bolts evenly or rod cap will cock preventing socket from engaging opposite rod bolt