Mercury Mariner 200, 225 Optimax Outboards Service Manual, 90-855348, Page 431Get this manual
REVERSE GEAR ASSEMBLYCOMPONENT DISASSEMBLY NOTE: Complete the instructions in this section only if the needle bearing in the gear has been found to be defective and the reverse gear is to be reusedBearings that have become dislodged may be snapped back into positionIf this is the only problem that exists it is not necessary to replace the needle bearing
IMPORTANT: The appearance of the forward and reverse gear is almost identicalThere are two ways to distinguish between the reverse and forward gearsThe reverse gear has shorter hub and it has groove cut into the back of the gear just inside the thrust bearing race
FORWARD
1Press the reverse gear needle bearing out using suitable mandrel