1990 Johnson Evinrude "ES" 40 thru 55, P/N 507872, Page 138Get this manual
Powerhead Servicing Removal '" 1To avoid accidental starting of engine while servicing, twist and remove all spark plug leadsOn electric start models, disconnect the battery cables at the battery2Remove the two lower engine cover screws:
Lower Rear Separate the two lower engine covers3Remove the shift rod screw 4Remove the nut from rear stud of the powerhead
[!] 5Remove the eight exhaust housing to powerhead screwsr:;] 6Using OMC Lifting Eye PIN 321537, pieces of OMC Universal Puller Set PIN 378103, and suitable hoist, lift the powerhead from the exhaust housing