1987-1993 Mercury Mariner Outboards 70/75/80/90/100/115HP 3 and 4-cylinder Factory Service Manual, Page 330Get this manual
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3 Remove four screws securing reservoir to manifold Manifold Removal
51486 ReservoirDriver ShaftOil Pump
Manifold and Pump O-ring (3) Spring Sleeve Spool
POWER-T