Mercury Mariner V-250 V-275 Outboard Service Shop Manual 1990, Page 210Get this manual
7Total up and down movement of driveshaft should be .002".006" (.OSlmm.152mm) indicated on dial indicatorIf, for exampletotal movement of driveshaft is indicated as .050"the sum left.046" (1.17mm) wou ld be the amount of shims placed under lower tapered roller bearing race BTo install shims, remove dial indicator assembly from gearcase9Install Driveshaft Holding Tool (91-12362) over crankshaft end of driveshaft10Use socket and flex handl to hold pinion nut (pad area where flex handle will contact gear housing
11 Remove pinion nut and washer from pinion gear while rotating driveshaft12.Remove pinion gear from gear housing13Use Collar Tool (91-93227) to remove driveshaft collar from gear housing
"'MCollar Tool (91-93227)