How to remove an alternator from a 2012 Accord v6 engine. After you have safely secured your vehicle, you'll need belt tensioner tool, a 14mm short socket a 14mm long socket, a 12mm socket a large screw driver or leverage bar, and a 10 mm socket. My toughest moment in this job was removing the alternator after all of the bolts were removed, You are going to have to use the leverage bar or large screwdriver to work the alternator back and forth. P.S you don't need to remove the tensioner, all of your mounting bolts are visible, just remove the serpentine belt and the fan housing that's closest to the alternator.