1991 Johnson/Evinrude Models "EI" 40 thru 55 Service Repair Manual P/N 507947, Page 243Get this manual
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9 AssembIe remaining shims, new tab-Iock washer, and nut onto driveshaftToque impeller nut to 16-18 ftIbs(22-24 Nm)Use new tab-Iock washer each time, and bend tabs around driveshaft nut to secue ;] :;