Mercury Mariner 4 and 5HP 4-Stroke Outboards Service Shop Manual 1999, Page 159Get this manual

CYLINDER BLOCK AND CRANKCASE
17Install the lifters at this time18Reassemble the camshaftAlign the mark on th camshaft with the mark on the timing gear
4-Stroke Oulboard Oil (92-828000A 12)

aLifters
bCamshaftAlignment Marks

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