Mercury Mariner 200, 225 Optimax Outboards Service Manual, 90-855348, Page 418Get this manual
10Form tool using 18 in(3 mm) wire as shown in the following figure and remove the forward gear bearing adaptor 12Remove the O-ring from inside the gear housing13Remove the forward gear, thrust race, and the thrust bearing (between the gear and the race)14Remove the forward gear shim
50786Wire ToolForward Gear Bearing Adaptor 50783Forward Gear Installation Tool (91-815850)
11Shift gear case into forward gearNOTE: The thrust race has tight fit in the gear housing boreUse the Forward Gear Installation Tool (91-815850) to remove the thrust race and the forward gear togetherIf this attempt fails, form small hook on the end of stiff piece of wire and while applying heat to the outside of gear case, pull the thrust race up and out of the gear housing