2003+ Mercury Mariner 225 HP EFI 4-Stroke Service Manual, Page 331Get this manual

2003+ Mercury Mariner 225 HP EFI 4-Stroke Service Manual, Page 331

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CYLINDER HEAD
1 Check free length limit "a" of each springReplace valve springs if out of specificationValve Spring Free Length 44.20 mm (1.740 in Minimum Valve Spring Free Length 42.60 mm (1.67