Abstract: A flywheel clutch mechanism interposed between the internal combustion engine crankshaft and the transmission of a motor vehicle wherein the clutch mechanism includes a flywheel mass, a separating clutch interposed between the crankshaft and the flywheel mass, and a starting and shifting clutch interposed between the flywheel mass and the transmission. In the assembly of the clutch mechanism, the flywheel mass, the separating clutch, and the starting and shifting clutch are all arranged to be initially mounted on the transmission side thereof and operatively supported thereat with the clutch disc of the separating clutch and the crankshaft being joined together so as to be nonrotatable relative to each other by a rotatively interlocking connection formed during the assembly of the combustion engine and the transmission.