1997 Johnson Evinrude "EU" 90 thru 115 90 CV Service Manual, P/N 507267, Page 167Get this manual
Disassembly
1To separate the adapter and the inner exhaust housing assembly from the outer exhaust housing, remove the front two rubber thrust mount screws and five retaining screws 2Remove the remaining thrust mount screwLift the mount plate and pry the mount from the adapter
3The inner exhaust housing and the water tube are attached to the adapter with five screwsIf necessary to disassemble, remove the five screws and lift the inner exhaust housing from the adapterDiscard the gasket4The water tube and water tube grommet can be removed from the base of the inner exhaust housingAssembly
1Place the upper thrust mount into the adapterPosition radius side of the mount facing aft and "TOP" mark facing up2Place the mount plate onto the thrust mount