2003+ Mercury Mariner 225 HP EFI 4-Stroke Service Manual, Page 374Get this manual

2003+ Mercury Mariner 225 HP EFI 4-Stroke Service Manual, Page 374

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CYLINDER BLOCKCRANKCASE
2 Measure the piston at point 0.51 in(13 mm) from the bottom, 90 to the piston pinReplace pistonconnecting rod assembly if out of specification

a- Piston Dia