1988 Johnson Evinrude CC 60 thru 75 outboards Service Repair Manual P/N: 507662, Page 234Get this manual
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Installation
5 Apply Gasket Sealing Compound to threads of the trim tab screwInstall the trim tab and align it with marksTighten the retaining screw to torque of 120-144 inIbs(14-16 Nm)