1988 Johnson/Evinrude "CC" 40 thru 55 Models Service Manual, Page 128Get this manual
Installation of Flywheel
1Install the flywheel key with outer edge parallel to centerline of crankshaft and single upset mark facing down
2Clean the crankshaft and flywheel tapers with OMC Cleaning Solvent and let dryThese surfaces must be clean and dry to allow proper locking of the tapers
3 Align the flywheel keyway and install flywheelCoat the threads