1980 Johnson 4HP Service Repair Manual P/N JM-8004, Page 70Get this manual
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DISASSEMBL OF GEARCASE
1 Driveshaft 2 Impeller key 3 Grommet 4 Screw 5 Impeller housing 6 Plate 7 Impeller 8 Cup 9 Spacer 100il seal 11 Pinion gear 12 Gearcase 13 Plug and washer 14 Prope