1990 Johnson Evinrude "ES" 40 thru 55, P/N 507872, Page 179Get this manual
Assembly
1Apply GMC Gasket Sealing Compound to both sides of EJ new adapter to exhaust housing gasket Place the gasket on the adapter2Secure the inner exhaust housinQ to the adapter
1101 3Slide one water tube grommet and the water tube cover
4 Slide the inner exhaust housing and the adapter into the outer exhaust housing Secure the adapter to the outer exhaust housing 5Install the two lower side mounts to the exhaust housingTighten the screws to torque of 18-20 ftIbs(25-27 Nm)Install the thrust mount to the housing and tighten the screws to torque of 60-84 inIbs(7-9 Nm)6Check condition of the shift rod seal and replace if necessaryInstallation
down the water tubePlace second water tube grommet in bore of the adapterAlign the water tube and secure the cover to the adapter