1987-1993 Mercury Mariner Outboards 70/75/80/90/100/115HP 3 and 4-cylinder Factory Service Manual, Page 25Get this manual
Ignition Components Removal and Installation Flywheel
REMOVAL 1Remove flywheel cover from engine
INSTALLATION
WARNING
Engine could possibly start when turning flywheel during installation; therefore, disconnect (and isolate) spark plug leads from spark plugs to prevent engine from starting1Disconnect spark plug leads from spark plugs2Place flywheel key into slot in crankshaft
WARNING
Engine could possibly start when turning flywheel during removal and installation; therefore, disconnect (and isolate) spark plug leads from spark plugs to prevent engine from starting2Disconnect spark plug leads from spark plugs3While holding flywheel with Flywheel Holder (91-52344), remove flywheel nut and washer