1993 Johnson Evinrude "ET" 40 thru 55 Service Repair Manual, P/N 508283, Page 190Get this manual
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[!] 4 Remove the exhaust relief plateDiscard the gasketAssembly
'sl6.Apply OMC Gasket Sealing Compound to threads of the four
inner exhaust housing retaining screwsInstall and tighten the