1997 Johnson Evinrude "EU" 40 thru 55 2-Cylinder Service Manual, P/N 507265, Page 199Get this manual
General Safety Warnings
Before working on any part of the gearcase, read the section called Safety at the end of this manualAvoid accidental starting of engine while servicing; twist and remove all spark plug leadsWhen using shop air for cleaning or drying parts: Be sure air supply is regulated to not more than 25 PSI (172 kPa) Be sure you use appropriate eye protection to avoid personal injuryReplace any locking fastener (locknut or patch screw) if its locking feature becomes weakDefinite resistance to tightening must be felt when reusing locking fastenerIf replacement is indicated, use only authorized replacement or equivalent