2001 Mercury Mariner 50-60HP Factory Service Manual, Page 227Get this manual

2001 Mercury Mariner 50-60HP Factory Service Manual, Page 227

CYLINDER HEAD
1Clean the carbon deposits from the valveDiscard any cracked, warped, or burned valves2Measure the valve stem to check for wearReplace valves if not in specification

Valve Stem Diameter "a" Intake Valve Exhaust Valve 0.21560.2161 in(5.4755.490 mm) 0.21500.2156 in(5.4605.475 mm)

3Check the valve face for pittingValves faces that are pitted must be refaced

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