1998 Johnson Evinrude "EC" 90, 115 SPL Service Repair Manual, P/N 520209, Page 219Get this manual
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9 Assemble remammg shims, new tab-lock washer, and impeller nut onto driveshaftTorque impeller nut to 16-18 ftIbs(22-24 Nm)Use new tab-lock washer each time, and bend tabs around driveshaft nut to sec