Mercury Mariner 30/40 4-Stroke Outboard Service Manual 1998, Page 42Get this manual

Mercury Mariner 30/40 4-Stroke Outboard Service Manual 1998, Page 42

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GENERAL INFORMATION
NOTE: Spark plug hole is 12 mm diameterUse SnapOn Tool MT26 18 adapter with valve core removed
Analysis
Due to standard engine tolerances and engine wear, no cyli

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