1990 Johnson Evinrude "ES" 40 thru 55, P/N 507872, Page 198Get this manual
1221 20Remove the forward gear, thrust bearing and thrust washer1231 21Inspect the water screen for blockageRemove the screens by removing both water screen screws22Inspect the pinion bearing for damage without removing itIf bearing is damaged, remove and discard the pinion bearing from the gearcaseIf the bearing is removed for any reason, it must be replaced Remove the bearing retaining screw from the gearcaseDiscard the seal from the screw Assemble the following components of OMC Pinion Bearing Remover and Installer PIN 391257 and OMC Pinion Service Kit PIN 433033 PIN
PIN 334987 Guide Plate (from PIN 433033) -20 inHex Head Screw in0.0Flat Washer -20 V2 inHex Head Screw