1998 Johnson Evinrude "EC" 90, 100C, 105C, 115, 150, 150C, 175 60 deg. LV Service Repair Manual, P/N 520210, Page 226Get this manual
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Disassembly
Inspect the drained lubricant for water or burned odorWater in the lubricant will give it milky appearanceOverheating will give the lubricant black color and burned odor