1978 Evinrude Outboards 9.9/15HP Service Manual, Page 85Get this manual
GEAACASE DISASSEMBLY
121 1NOTE See "GEARCASE REMOVAL Remove oil level and fill plugDrain gearcaseRemove cotter pin, nut, thrust washer, propeller, and thrust bushingSee Figure 6-22Remove driveshaft "0" ring, four screws and lift impeller housing, cup, impeller, pin, and impeller plate from gearcaseSee Figure 6-23Remove cup from impeller housingSee Figure 6-24Figure 6-26Removing Bearing Housing 5IMPELLER HOUSINGCUP
Remove propeller shaft and reverse gear from gearcaseAvoid loss of two detent balls and springSee Figure 6-27