Friend is easy to determine where the noise is, take out the elements of elements (alternator, hydraulic, etc.) and you have walk the vehicle if the noise disappears is from the belt or from any of the elements, if the noise persists is of the distribution, now Conditioning, tensioning bearing and crazy bearings, everything that turns less the crankshaft obio, and you will easily hear which one that puts the noise. Mas há um ponto especial se o ruído não foi antes de você colocar a nova bomba que você instalou o cronograma mais causado, o rolamento disso é o problema.