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

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CYLINDER HEAD
VALVE GUIDE INSPECTION 1 Measure the valve guide bore (a)If valve guide wear is out of specification, replace the valve guide
Valve Guide Inside Diameter
Intake Valve E