2003+ Mercury Mariner 225 HP EFI 4-Stroke Service Manual, Page 64Get this manual

2003+ Mercury Mariner 225 HP EFI 4-Stroke Service Manual, Page 64

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GENERAL INFORMATION

c- "3TDC" timing mark TDC for Cylinder #3d- Timing pointer

NOTE: Spark plug hole is 14 mm diameterUse Snap-On Tool MT26J300 adapter with valve core remove