1987-1993 Mercury Mariner Outboards 70/75/80/90/100/115HP 3 and 4-cylinder Factory Service Manual, Page 368Get this manual

1987-1993 Mercury Mariner Outboards 70/75/80/90/100/115HP 3 and 4-cylinder Factory Service Manual, Page 368

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2 Apply marine sealer to shanks of mounting bolts (not threads) and secure engine to transom with bolts, flat washers and locknuts, as shownBe sure that installation is water-tight WARNING