Mercury Mariner V-250 V-275 Outboard Service Shop Manual 1990, Page 123Get this manual
Pistons and Piston Rings IMPORTANT: If engine was submerged while engine was running, piston pin and or connecting rod may be bentIf piston pin is bent, piston must be replaced(Piston pins are nol sold separately because 01 matched fit Into piston If piston pin is bent, connectIng rod must be checked for straightness (refer toConnecting Rods", followingfor checking straightness)1Inspect pistons for scoring and excessive piston skirt wear2Remove piston rings
3Remove (and isca rd) snap rings
aSnap Ring (Discard After Removal)Snap Ring Removal Tool (91-52952A 1)
4Remove wrist pin