2001 Mercury Mariner 50-60HP Factory Service Manual, Page 51Get this manual
![2001 Mercury Mariner 50-60HP Factory Service Manual, Page 51](051.jpg)
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GENERAL INFORMATION
NOTE: Spark plug hole is 12 mm diameterUse Snap-On Tool MT26-18 adapter with valve core removed
Analysis
Due to standard engine tolerances and engine wear, no cyl