Pulley device for a belt, installation method of such a device and motor vehicle equipped with such a device

A motor vehicle comprising:

• a pulley device having an eccentric adjusting member dedicated to be fixed on a support, an eccentric hub rotatably mounted on the eccentric adjusting member, a torsion spring between the eccentric adjusting member and hub so as to exert a biasing force in a belt-tightening direction, and a pulley rotatably mounted on the hub, wherein the hub further comprises an upper radial surface and the eccentric adjusting member comprises a radially outwardly projecting flange formed at an upper end of the eccentric adjusting member and forming an axial abutment for the upper radial surface of the hub, wherein the upper radial surface of the hub comprises a pair of axially projected stops that are formed integrally with, each stop being dedicated to come into abutment against a corresponding stop comprised by the radially outwardly projecting flange of the eccentric adjusting member when the hub rotates in one direction or the other, so as to couple in rotation the hub and eccentric adjusting member in the direction, and wherein the hub further comprises engaging means adapted to cooperate with an external tool, the engaging means being circumferentially located between the projected stops of the hub, and
• an engine, and wherein
• a fixed part, such as engine block, constitutes a support for that pulley device.