1990 Johnson Evinrude "ES" 40 thru 55 Service Repair Manual, P/N 507872, Page 263Get this manual

1990 Johnson Evinrude "ES" 40 thru 55 Service Repair Manual, P/N 507872, Page 263

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General Safety Warnings

Replace any locking fastener (locknut or patch screw) if its locking feature becomes weakDefinite resistance to tightening must be felt when reusing locking fasten