Mercury Mariner 30/40 4-Stroke Outboard Service Manual 1998, Page 207Get this manual

Mercury Mariner 30/40 4-Stroke Outboard Service Manual 1998, Page 207

CYLINDER HEAD
Cylinder Head
1Inspect the cylinder head for mineral depositscorrosion in the water passage ways, clean any depositscorrosion observed2Inspect the cylinder head for carbon deposits In combustion chamber (use round scrap er to clean away deposits)Be careful not to scratch or remove material
3Using straight edge and thickness gauge inspect cylinder head for warpage Re place cylinder head If out of specification

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