Mercury Mariner 4, 5, and 6HP 4-Stroke Factory Service Manual, Page 164Get this manual

CYLINDER BLOCK AND CRANKCASE
2Install the breather tubes and wave washers

aBreather Tube (2)Wave Washer (2) 3Install the breather cap

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