2001 Mercury Mariner 50-60HP Factory Service Manual, Page 237Get this manual

CYLINDER HEAD
Rocker Arm Shaft Assembly
1Apply engine oil to the rocker shaft and arms2Locate the end of the rocker shaft that gets installed towards driven gear (oil holes will line-up with the mating oil holes in the cylinder head)3Slide the rocker arms onto rocker shaft as shown

aRocker ShaftRocker Arms

Rocker Arm Shaft Installation

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