2001 Mercury Mariner 50-60HP Factory Service Manual, Page 259Get this manual
CYLINDER BLOCKCRANKCASE
6Use 516 in12 point socket and remove connecting rod bolts7Remove carbon ridge from the cylinder bore using burr knifePush out the pistonsKeep each piston, connecting rod, and cap together as an assembly
NOTE: Use piston ring expander tool to prevent rings from breakingIf reusing rings, mark their location (piston #1, #2, #3, or #4) for correct installationNOTE: Each connecting rod and cap are matched setThey must not be interchanged