New sos

What friends, bother them again, my "rusito" tavria, makes a noise Ke looks like gasolo , notic that the water pump has a game, but my brother -in -law, that knows a lot of mechanics, told me that the noise seems to be the ruleman of the tensor of the distribution belt, could someone tell me if that can be that?
Thank you very much and a big hug, along with a backward greeting for the New Year !!!