Mercury Mariner Outboards 2.2 / 2.5 / 3.0 Service Shop Manual, Page 60Get this manual
Propeller Shaft Removal
Remove bearing using suitable puller
13Pull propeller shaft (a) and shim(s) (b) from housing Replace shaft if: gear is chipped or worn shaft seal surface is deeply grooved, allowing water to enter gear housing shear pin hole (or impeller drive pin hole) is worn