Mercury Mariner 200, 225 Optimax Outboards Service Manual, 90-855348, Page 464Get this manual
3Insert Forward Gear Installation Tool (91-815850) into forward gearbearing adaptor assembly Final Installation (Ratcheting and Non-Ratcheting)
1Ensure that the top of the bearing adaptor is clean and install the small thrust race on top of the bearing adaptor
55221Forward Gear Installation Tool (91-815850)Forward GearBearing Adaptor Assembly
4Install tool with adaptor assembly over propeller shaft and into gear housingApplying downward pressure to bearing adaptor, remove installation tool from assembly