Honda BF8, BF9.9 and BF10 Outboard Motors Shop Manual., Page 81Get this manual
cWATER SEAL REPLACEMENT IRemove the water seal using commercially available oil seal remover
2) Apply soapy water the outside of the water seal(s), and install the water seal in the direction shown using the following tools
[and types 121 13 22 mm WATER SEAL MARINE GREASE
TOOLS: and types: Driver Attachment, 22 24 mm Pilot, 13 mm