1970 Evinrude Ski-Twin, Ski-Twin Electric 33 HP Service Manual 4687, Page 58Get this manual
gCheck water intake screen and passages by removing by-pass coverhInspect clutch dog, drive gears, pinion gear, and thrust washers for wearReplace if wornIf shifter dog and drive gear engagement surfaces are chipped or excessively rounded off, this may indicate improper shifting by operator of motor, or incorrect adjustment of remote controlsiWash bearings in clean solvent such as Solvasol and dry with compressed airReplace if worn or pitted4234