1987-1993 Mercury Mariner Outboards 70/75/80/90/100/115HP 3 and 4-cylinder Factory Service Manual, Page 275Get this manual
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Striker Plate Replacement Visually inspect striker plates (a) and replace if worn excessively
51344 Fill Plug and O-ring (remove to fill system, tighten securely)Oil Can (fill system with Quicks