Mercury Mariner V-250 V-275 Outboard Service Shop Manual 1990, Page 166Get this manual
lORemove upper mount bracket and upper mou ntsNOTE: Two dowel pins should remain in mount bracket when bracket is removed from exhaust plate11 Remove ex haust plate and gasket (below plate) 12Pull exhaust tube out of drive shaft housi ng
aDrive Shall HousingExhaust TubeSealWaler Tube
Upper Moun BracketUpper Mounts 80115, Bracket Retaining Exhaust Plate Botts and Lockwashers, Exhaust Plate Retaining