2001 Mercury Mariner 50-60HP Factory Service Manual, Page 220Get this manual

CYLINDER HEAD
Camshaft Removal
1Hold driven gear using tool (91-83163M) and remove bolt and flat washerRemove driven gear2Remove camshaft retaining pinSlide camshaftoil seal out of cylinder head
NOTE: The cam can also be removed from the top without removing the cylinder head from engine

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