Mercury Mariner 4, 5, and 6HP 4-Stroke Factory Service Manual, Page 156Get this manual
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CYLINDER BLOCK AND CRANKCASE
Measuring Side Clearance of the Big End of Connecting Rod
Standard Value 0.0080.016 in(0.2 0.4 mm) Out of the Limit If 0.027 in(0.7 mm) or more requires