Mercury Mariner Outboards 2.2 / 2.5 / 3.0 Service Shop Manual, Page 47Get this manual

Mercury Mariner Outboards 2.2 / 2.5 / 3.0 Service Shop Manual, Page 47

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Install piston ring (a) using Piston Ring Expander Tool (91-24697) as shown IMPORTANT: Piston ring must be installed so that the grooved end of the piston ring is toward top side of piston as shown