1976 Johnson 4HP 4R76, 4W76 Outboards Service Repair Manual P/N JM-7603, Page 20Get this manual
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CORE PLUGS If leakage occurs at plug '; smart tap with hammer and f1at end punch il1 tlle cel1ter of the plug mll tl1is COl1ditiOIlSee Figure 3-10 If necessary, remove plug to out slow speed hol esSee