Honda Outboards BF40A/BF50A Service Manual, Page 141Get this manual
HONDABF35A45A IMPELLER
INSTALLATION: Check the impeller for wear or cracksInstall the impeller by turning it counterclockwise with the side where the groove reaches to the end toward up[1] GROOVE
7 mm WATER SEAL
[1] s.700L I
OIL SEAL REMOVER
REMOVALINSTALLATION: Removeinstall the water seals using the special toolsTOOLS: Oil seal remover Handle A