2000-2005 Yamaha F40B Outboard Service Manual, Page 298Get this manual
PROPELLER SHAFT HOUSING ASSEMBLY
3Install: Reverse gear Reverse gear shim(s) Ball bearing NOTE: _ Before press-fitting the ball bearing, install the reverse gear shim(s)Install the ball bearing with its manufacturer's marks G) facing the reverse gearDriver rod YB-06071 Bearingoil seal attachment YB-06276-B90890-06659