1990 Johnson Evinrude "ES" Cross V 88 thru 115, 150 thru 175, P/N 507874, Page 201Get this manual
12711291 4150,155 modelsPlace new plate to adapter gasket
on the adapterDo not use sealer on the gasketPlace the plate CD on the gasketPlace the megaphone on the plateApply OMC Gasket Sealing Compound to threads of the megaphone retaining screwsInstall and torque the screws to 60-84 inIbs(7-9 Nm)
1281 5175 modelPlace new megaphone to adapter gasket on
the adapterDo not use sealer on the gasketPosition the megaphone Apply OMC Gasket Sealing Compound to threads of the megaphone retaining screwsInstall and torque the screws to 60-84 inIbs(7-9 Nm)
1261 6Check the condition of the seal
on the inner exhaust housing and replace if necessaryApply OMC Adhesive Mto the seal surface of the housing before installing new seal
7Position the water tube and water tube grommet in the base of the inner exhaust housing to the adapter8Apply OMC Gasket Sealing Compound to new inner exhaust