Mercury Mariner 4, 5, and 6HP 4-Stroke Factory Service Manual, Page 127Get this manual

Mercury Mariner 4, 5, and 6HP 4-Stroke Factory Service Manual, Page 127

CYLINDER HEAD
4Check the margin thickness (a) of the valves after the valves have been groundAny valve with margin thickness of less than the specification, should be replaced45

Margin Thickness "a" Intake Valve Exhaust Valve 0.0280.047 in(0.71.2 mm)

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