1979 Evinrude 4 HP Outboards Service Manual, PN 5424, Page 67Get this manual
REMOVAL OF GEARCASE It is possible to remove the gearcase without removing the powerhead or exhaust housing aRemove the screws attaching the gearcase to the exhaust housingSee Figure 6-3bWithdraw the gearcase carefully to avoid damaging the driveshaft and water tube
bRemove plate from impeller housing coverRemove impeller from impeller housing cupRemove spacer from inside of water pump cavitySee Figures 6-7 and 6-12Remove and discard water tube grommet from impeller housing coverSee Figures 6-4 and 6-7Inspect components for wear and deterioration, and replace as necessarycReassemble impeller into cup with blades positioned as shown in Figure 6-6
1Weedless 2Standard