Yamaha Outboard F15A F9.9C, FT9.9D F15 Service Manual, Page 352Get this manual
LOWR PROPELLER SHAFT HOUSING ASS'Y (FT9.9D)
3Install: Ball bearing
Install the ball bearing with its manufacturer's marks facing towards the reverse gearDriver rod 1: 90890-06606 Ball bearing attachment 2: 90890-06632 2