1987-1993 Mercury Mariner Outboards 70/75/80/90/100/115HP 3 and 4-cylinder Factory Service Manual, Page 138Get this manual
3Remove 10mm bolt from lower oil tank support (starboard side of engine, base)4Remove (8mm) Bolts from upper oil tank neck brace5Remove Air Box by removing nuts and pulling off of carburetor studs6Disconnect Oil LinesRemove Oil Reservoir c a
1-unit Removal Of Carburetor Assembly19546
10Remove Intake Manifoldssee below
19097Oil Tank SupportBolts (8mm)Nuts (6)