The belt of the van is very loud. Why
Timing belt, Timing belt) is an important part of engine distribution system, through the connection with the crankshaft and comply with a certain ratio to guarantee the accuracy of the inlet and exhaust time. Using a belt rather than a gear is driven by low noise, accurate transmission, small variation and easy to compensate. Obviously, the belt must be shorter than a metal gear, so be sure to change your belt regularly.
Cars emit some crackers ring, should be a reason from the belt, belt tension is not enough, loose, may also be the comparison of belt and pulley jointing surface grinding smooth, cause and load belt friction between the gear is not enough, sliding friction noise, see if generators generators turn smooth. At this moment, do you want to take a look at the tensioner, is that kind of manual tension, no problem, if the belt can tight the bolt general generator generator beside a bolt tensioning, continue to make it tight.
It could be a belt loose or a crack. Belts have water, oil, pebbles, and aging, which can cause a belt to chirp.
