1987-1993 Mercury Mariner Outboards 70/75/80/90/100/115HP 3 and 4-cylinder Factory Service Manual, Page 334Get this manual
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Reservoir Installation 1 Torque end cap screws to 13 lb in(1.5 Nm)
7 Insert manual release valve into manifold and tighten snugglyBack release valve out turns maximum allowing trim rod in