Mercury Mariner 4, 5, and 6HP 4-Stroke Factory Service Manual, Page 121Get this manual

Mercury Mariner 4, 5, and 6HP 4-Stroke Factory Service Manual, Page 121

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CYLINDER HEAD
aWater PassagesCombustion Chamber 3 Using straight edge and thickness gauge inspect cylinder head for warpageReplace cylinder head If out of specification
Cylinder Head Warpa