Mercury Mariner V-250 V-275 Outboard Service Shop Manual 1990, Page 273Get this manual
4Place continuity washer (if equipped) onto shoutder of rear thrust hub56Place rear thrust hub, lab washer and propeller nut on propeller shaftThread propeller nut onto propener shaft until nut is recessed into tab washer 7Torque propeller nut to 55 lbIt(74.6 Nm) 8Bend tabs of tab washer down into grooves of rear thrust hub to secure propeller nul(If tabs do not align with slots, continue to tighten propeller nut to obtain alignmentDO NOT loosen nut to align tabs
aContinuity Washer (I' Equipped)Rear Thrust WasherTab WasherPropeller Nut