2009 Yamaha F40 Outboard Service Manual, Page 252Get this manual
Propeller shaft housing
Assembling the propeller shaft assembly1Install the dog clutch onto the propeller shaft with the "F" mark facing toward the forward gear2Install the spring and the slider into the propeller shaft b
Driver handle (large) h: YB-06071 Bearing housing needle bearing remover i: YB-06112
Checking the propeller shaft
1Check the propeller shaftReplace if damaged or worn2Measure the propeller shaft runoutReplace if above specification