1989 Johnson/Evinrude 40 thru 55 HP Models Service Manual P/N 507755, Page 150Get this manual
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Installation 1 Position gasketnew powerhead gasket00 not use sealer
screws to 18-20 ftIbs(25-27 Nm)
5 Install the exhaust housing to powerhead nutTighten the nut to 18-20 ftIbs(25-2