Mercury Mariner 4 and 5HP 4-Stroke Outboards Service Shop Manual 1999, Page 104Get this manual
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CYLINDER HEAD
GASKET THERMOSTAT COVER GASKET THERMOSTAT 126 degrees (52 degrees C) BOLT IM8 90 mm) BOLT IM8 60 mm) SPARK PLUG INGKUDCPR6E) COVER GASKET BOLT (M6 20 mm) WASHER 70 18 18 13<