2003+ Mercury Mariner 225 HP EFI 4-Stroke Service Manual, Page 330Get this manual

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CYLINDER HEAD
3 Measure the valve stem diameterReplace valves if out of specification
Valve Stem Diameter (a) Intake Valve Exhaust Valve 5.477-5.492 mm (0.2156-0.2162 in 5.464-5.479 mm (0.

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