1990 Johnson Evinrude "ES" Colt/Junior thru 8 Service Manual, P/N 507870, Page 208Get this manual
[!] 5Slide the driveshaft up and out of the gearcase6Remove the two gearcase head screws f10l 7Using soft mallet, alternately tap each of the ears of the
gearcase head either clockwise or counterclockwise until the gearcase head is in the position shownThen tap the ears from behind alternately to disengage the gearcase head O-ring8Remove the propeller shaft componentsRemove the gearcase headDiscard the gearcase head O-ring 9Remove the pinion, thrust bearing and thrust washer
f13l 10Insert