Mercury Mariner 200, 225 Optimax Outboards Service Manual, 90-855348, Page 440Get this manual
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 5Press the bearing adaptor into the gear housing using the installation tool as follows:
IMPORTANT: Be sure that the bearing adaptor is positioned as straight as possible to avoid cocking it in the bore while pressing it in
aLubricate the threads of the installation tool with 2-4-C wTeflon (92-825407 12)bTurn the hex-head screw of the installation tool until the bearing adaptor bottoms out on the gear housing shoulderDO NOT continue to turn the tool once the screw resistance goes up noticeably50885