2003+ Mercury Mariner 225 HP EFI 4-Stroke Service Manual, Page 377Get this manual

2003+ Mercury Mariner 225 HP EFI 4-Stroke Service Manual, Page 377

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CYLINDER BLOCKCRANKCASE

PISTON PIN BOSS BORE
1 Measure the piston pin bore diameterReplace the piston if out of specification
Piston Pin Bore Diameter 21.02-21.03 mm (0.8276-0