Mercury Mariner 4 and 5HP 4-Stroke Outboards Service Shop Manual 1999, Page 147Get this manual

Mercury Mariner 4 and 5HP 4-Stroke Outboards Service Shop Manual 1999, Page 147

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CYLINDER BLOCK AND CRANKCASE
If 0.962 in(24.96 mm) or less requires
replacement
Measuring Oil Clearance at Big End of Connecting Rod Using Plastigauge
Standard Value