1991 Johnson/Evinrude Models "EI" 40 thru 55 Service Manual, Page 21Get this manual
Gearcase LubricationAll Models i and remove all spark plug leads'" To avoid accidental starting of engine while servicing, twist
Remove oil drainfill plug and oil level plug from gearcaseWith motor in normal operating position, allow oil to drain completelyTo refill, place tube or pressure can nozzle of OMC Hi-Vis gearcase lubricant in drainfill holeIf OMC Hi-Vis gearcase lubricant is not available, OMC Premium Blend gearcase lube can be used as an alternate With motor in normal operating position, fill until lubricant appears at oil level hole Install oil level plug before removing lubricant tube or pressure can nozzle from oil drainfill holeDrainfill plug can then be installed securely without oil loss Torque plugs to 60-84 inIbs(7-9 Nm)