Mercury Mariner 4 and 5HP 4-Stroke Outboards Service Shop Manual 1999, Page 164Get this manual

CYLINDER BLOCK AND CRANKCASE
26Support oil seal housing and install two seals and spacerUse driver and mandrel as shown

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