1990 Johnson Evinrude "ES" 9.9 thru 30 Service Manual, P/N 507871, Page 252Get this manual
Gearcase Servicing10, 14, 25 Comm 28 i twist and remove all spark plug leadsRemoval0, 14
"" To avoid accidental starting of engine while servicing,
!Il lRemove the one retaining nut and lock washer!II 2Remove the four gearcase retaining screws f21
3Shift the motor to reverse gearLower the gearcase enough to remove the lower shift rod connector screw Remove the gearcase and mount in suitable holding fixture
5The impeller housing spacer may come out with the gearcase or stay in the exhaust housing Locate the spacer and discard the O-ringsUse new O-rings on reassembly