Mercury Mariner V-250 V-275 Outboard Service Shop Manual 1990, Page 161Get this manual
Exhaust Adaptor Plate Components , '
DESCRIPTION Exhaust Adaptor Plate Grommet (2) Carrier (2) Poppet Relief Valve (2) Spring (2) Gasket (2) Plate (2) Diaphragm (2) Washer (2) Screw (2) Cover (2) Bolt (4) Elbow (2) Dowel Pin (2) Screw Gasket Seal Gasket Exhaust Plate Gasket Bolt (3) Lockwasher (3) Shift Shaft, Upper Bushing Leve Roll Pin Shift Link Bushing Wavewasher Nut Bolt Nut (516"-24) Wavewasher (2) Nut (14"-28)