Mercury Mariner 30/40 4-Stroke Outboard Service Manual 1998, Page 228Get this manual

Mercury Mariner 30/40 4-Stroke Outboard Service Manual 1998, Page 228

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PISTON RING (2 NO (.25mm OS) PISTON RING (2 NO (.50mm OS) PISTON OIL RING (STANDARD) PISTON OIL RING (.25mm OS) PISTON OIL RING (.50mm OS) PISTON