Mercury Mariner 200, 225 Optimax Outboards Service Manual, 90-855348, Page 445Get this manual
Drive ShaftBearing Preload Tool INSTALLATION
NOTE: Ensure that the top nut and the bottom nut of the bearing preload tool are screwed as close together as possible prior to proceeding with the following step
3Measure distance (a) and increase that distance by in(2S.4mm) by turning bottom nut away from top nut
1Install the components from the Bearing Preload Tool Kit (91-14311A1), over the drive shaft in the order shown
aMeasure distance and increase by in(25.4mm)Bottom Nut [screwed down by approximately in(25.4mm)]