1990 Johnson Evinrude "ES" 40 thru 55, P/N 507872, Page 216Get this manual
16Inspect the pinion bearing for damage without removing itIf the bearing is removed for any reason, it must be replaced Remove the bearing retaining screw from the gearcaseDiscard the O-ring from the screw Assemble the following components of OMC Pinion Bearing Remover and Installer, PI 391257, in the gearcase PI 326586 PI 391260 PI 326582 CD PI 326580