Mercury Mariner 4 and 5HP 4-Stroke Outboards Service Shop Manual 1999, Page 185Get this manual

GEAR HOUSING
3Remove nut (a), washer (b), propeller (c) and thrust hub (d)

Gear Housing Removal

1Remove (and isolate) spark plug lead from spark plug

• ATV
• Jet Ski
• Outboard Motors
• Personal Watercraft
• Snowmobiles
• Stern Drives