Mercury Mariner 4, 5, and 6HP 4-Stroke Factory Service Manual, Page 169Get this manual

Mercury Mariner 4, 5, and 6HP 4-Stroke Factory Service Manual, Page 169

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CYLINDER BLOCK AND CRANKCASE
aLiftersCamshaftAlignment Marks 19 Reinstall the cylinder head
NOTE: Be sure cylinder head and cylinder block gasket surfaces are clean and free of oilCylinder