2009 Yamaha F40 Outboard Service Manual, Page 264Get this manual
Drive shaft and lower case
Installing the lower unit
Do not hold the propeller with your hands when loosening or tightening it Make sure to disconnect the battery cables from the battery and the clip from the engine shut-off switch When installing the lower unit with the power unit installed, make sure to suspend the outboard motorIf the outboard motor is not suspended, it can fall suddenly and result in severe injuries1Check that the pin is aligned with the alignment mark on the shift bracket a
When installing the water pump housing, apply grease to the inside of the insert cartridge, and then turn the drive shaft clockwise while pushing down on the water pump housing