Mercury Mariner 4 and 5HP 4-Stroke Outboards Service Shop Manual 1999, Page 126Get this manual

CYLINDER BLOCK AND CRANKCASE
Special Tools
1Pislon Ring Expander (PIN 91-24697)
2Putler Assembly (PIN 91-83165M)

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