Cambelt Centre Idler Pulley - Mitsubishi Legnum/Galant VR4 EC5W EC5A This should be changed along with the Cambelt Tensioner. The reason you should change is that if you leave it then your asking it to do over 100,000 miles as the cambelt change is approx every 54,000 miles. See HERE for exploded diagram Mitsubishi Part Number MD179597
