Mercury Mariner 30/40 4-Stroke Outboard Service Manual 1998, Page 7Get this manual
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SPECIFICATIONS
2.55702.5578 in(64.95064.965 mm) 2.56692.5675 in(65.265.2 15 mm) 2.57682.5774 in(65.45065.465 mm) 0.0014.0026 in(0.0350.065 mm)
PISTON CLEARANCE
Ring End