Mercury Mariner Outboard 40/50/55/60 2-stroke Service Manual, Page 195Get this manual

Mercury Mariner Outboard 40/50/55/60 2-stroke Service Manual, Page 195

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CLEANING PISTON RING GROOVES IMPORTANT: The piston rings are half keystone rings (tapered on the top side) follow cleaning and inspection carefully! Chromed ring is installed on top.50 in(12.7 mm)