2003+ Mercury Mariner 225 HP EFI 4-Stroke Service Manual, Page 346Get this manual

2003+ Mercury Mariner 225 HP EFI 4-Stroke Service Manual, Page 346

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CYLINDER HEAD
a -"1TDC" timing mark -Timing pointer -Driven sprocket timing marks -Cylinder head timing marks 9 Install the spark plugsTighten to specified torqueSpark Plug Torque 25 Nm (18.5 lb