Mercury Mariner V-250 V-275 Outboard Service Shop Manual 1990, Page 223Get this manual
4Place rear thrust hub, tab washer and propeller nut on propeller shaft5Thread propeller nut on propeller shaft until nut is recessed into tab washer6After propeller nut is recessed into tab washer, tighten nut securely [minimum of SSlbsft(75 N.m) torque) 7Bend of the tabs of tab washer down in grooves of rear thrust hub to secure propeller nut(11 tab washer tabs do not al ign with slots, contin ue to tighte propeller nut to obtain alignmentDO NOT loosen nut to align tabs