1987-1993 Mercury Mariner Outboards 70/75/80/90/100/115HP 3 and 4-cylinder Factory Service Manual, Page 292Get this manual
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TILT RAM REMOVALPOWER TRIM SYSTEM REMOVED FROM OUTBOARD
51364 51366 Cap (Turn counterclockwise to remove)Spanner Wrench (91-74951)Tilt RodPull to remove
2 Remove lower swivel pin