Mercury Mariner 4 and 5HP 4-Stroke Outboards Service Shop Manual 1999, Page 139Get this manual

CYLINDER BLOCK AND CRANKCASE
8Disassemble the oil pump

Bolt (2) M6 20CoverO-Ring SealRotorOuterRotorInnerPin

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