Mercury Mariner Outboard 225 3 Litre Service Manual 1994, Page 251Get this manual
Gear LocationBacklashes Checking and Adjustment Drive ShaftBearing Preload Tool
INSTALLATION
,Install the components from the Bearing Preload Tool Kit (91 14311A1)over the drive shaft in the order shown
3Measure distance (a) and increase that distance by in(25.4mm) by lurning bottom nul away from top nut
bBottom nut (screwed down approximately in(2S.4mm)
Rotate the drive shaft at least three full turns in clockwise direction(i)