1968 Evinrude Ski-Twin, Ski-Twin Electric 33 HP Outboards Service Manual, Page 55Get this manual
gCheck water intake screen and passages moving by-pass cover re-
hInspect 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 this indicate improper shifting operator of motor, or incorrect adjustment of remote controlsiWash bearings in clean solvent such as Solvasol and dry with compressed airReplace if worn or pitted
Figure 6-13Removing Shift Rod Bushing Inspect driveshaft splines for shaft if worn wearReplace
NOTE bent exhaust tube cause upper driveshaft splines to wear excessively, and also damage crankshaft splinesdInspect gearcase and exhaust housing for nicks the machined surfacesRemove nicks and re-surface faces surface plateStart with No120 emery and finish with No180Check parallelism plate with surface gage and scriberSee Figure 6-15drill press table will also serve, using the spindle as gageDo not attempt to straighten, replace if bentInspect water tube for obstructions or kinks which restrict water flow