Johnson Evinrude Outboard Motors 1956-1970 1.5-40hp repair manual., Page 211Get this manual
STARTER MOTOR for more than 3D-seconds without allowing the motor to cool for at least three minutesActually, this time can be spent in making preliminary checks to determine why the engine fails to startMost starter motors operate in much the same manner and the service work involved in restor ing defective unit to service is almost identicalTherefore, the information in this chapter is grouped together for the major components of the starter under separate headingsDifferences, where they occur, between the various manufacturers, are clearly indicatedTheory of Operation Power is transmitted from the starter motor to the engine flywheel through Bendix dr ive, This drive has pinion gear mounted on screw threadsWhen the motor is operated, the pinion gear moves up into mesh with the teeth on the flywheel ring gearWhen the engine starts, the pinion gear is driven faster than the shaft, and as result, it screws out of mesh with the flywheelA rubber cushion is built into the Bendix dr ive to absorb the shock when the pinion meshes with the flywheel ring gearThe parts of the drive MUST be properly assembled for efficient operationIf the drive is removed for cleaning, TAKE CARE to assemble the parts as shown in the accompanying illustrationIf the screw shaft assembly is reversed, it will strike the splines and the rubber cushion will not absorb the shock 6-23