1968 Evinrude Big Twin, Big Twin Electric, Lark 40 HP Outboards Service Manual, Page 67Get this manual
Figure 6-36Checking Parallelism gInspect gearcase for nicks the machined surfacesRemove nicks and re-surface faces surface plateStart with Number 120 emery cloth and finish with Number 180 emery clothCheck parallelism plate with surface gage and scriberdril1 press table will also serve, using the spindle as gageFigure 6-36DO NOT attempt to straighten bent gearcase; replace ithRe-surface and inspect exhaust housing in like mannerReplace if bentNOTE bent exhaust housing cause upper driveshaft splines to wear excessively, and also damage crankshaft splinesiInspect water tubes for obstructions or kinks which restrict water flowjInspect water impeller and replace if vanes are damaged or worn excessivelyInspect housing for scoring and replace if damagedInspect impeller housing plate and replace if scored or pitted 25 14
Figure 6-37Checking Coils (forward and reverse) leads which could cause both coils to operate at The green lead is for the "Forward" gear range and tlie lead is for the "Reverse"ELECTRIC CLUTCH HUBS