1995 Johnson/Evinrude Outboards 40 thru 55 2-Cylinder Service Repair Manual P/N 503148, Page 240Get this manual
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Jet Drive Servicing
5 Bend tab-Iock washer ears and remove impeller nut Remove tab-Iock washer and discard
6 Note the number and placement of impeller shimsRefer to Impeller Clearance Adju