Mercury Mariner V-250 V-275 Outboard Service Shop Manual 1990, Page 299Get this manual
5Install upper end frame cap by inse rting thru studs thru ring terminals of wires and stud holes in field and frame assembly 9Install studs, coupling and "0ring 10Align coupling slot (shallow) with adaptor shaft by
inserting screwdriver into deep slot and turning coupling 1 turn (push down on screwdriver while turning) 11 Lubricate coup ling with Quicksilver Lubricant or Quicksilver 2-4-C