Mercury Mariner 4 and 5HP 4-Stroke Outboards Service Shop Manual 1999, Page 143Get this manual

Mercury Mariner 4 and 5HP 4-Stroke Outboards Service Shop Manual 1999, Page 143

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CYLINDER BLOCK AND CRANKCASE
17 Remove the breather tubes and wave washers
aBreather Tube (2)Wave Washer (2)