2009 Yamaha F40 Outboard Service Manual, Page 263Get this manual
Lower unit
Installing the propeller shaft housing assembly
1Install the washer and the propeller shaft assembly into the propeller shaft housing c
3Install the Woodruff key f
4Align the key way on the impeller with the Woodruff key f, and then install the impeller g
2Install the shift plunger and the propeller shaft housing assembly e