Mercury Mariner 200, 225 Optimax Outboards Service Manual, 90-855348, Page 451Get this manual
8Install the forward gear bearing adaptor using hook tool (which was fashioned when the adaptor was removed) as shownEnsure that the adaptor seats evenly against the thrust race 10Install the bearing carrier over the propeller shaft pushing bearing carrier down until it is fully seatedb-
55429 55430 Hook Tool Forward Gear Installation Tool (91-815850) Forward Gear Bearing Adaptor Thrust RacePropeller ShaftBearing Carrier
9Remove the hook tool and while holding down on the forward gear remove the forward gear installation tool