Mercury Mariner 4, 5, and 6HP 4-Stroke Factory Service Manual, Page 155Get this manual

Mercury Mariner 4, 5, and 6HP 4-Stroke Factory Service Manual, Page 155

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CYLINDER BLOCK AND CRANKCASE

1 Subtract the piston pin diameter from the piston pin hole diameter
Measuring Piston Ring Side Clearance
Standard Value Top Second Oil 0.00150.00