A hydrokinetic torque coupling device includes a turbine wheel (3), an impeller wheel (2) able to hydrokinetically drive the turbine wheel (3), a cover (5) non-rotatably attached to the impeller wheel (2) so as to define an internal volume (6) accommodating the turbine wheel (3), and a seal (18) mounted to a radially external periphery of the turbine wheel (3). The turbine wheel (3) being able to be axially moved between an engaged position and a disengaged position. The seal (18) configured to engage one of a matching sealing surface (22) of the impeller wheel (2) positioned radially outside the turbine wheel (3) and the cover (5) in the engaged position and to be disengaged from one of the matching sealing surface (22) the impeller wheel (2) and the cover (5) in the disengaged position.