Method for assembling a module for a motor vehicle engine, which module comprises at least one supporting structure with bearing seats and at least one camshaft which is mounted rotatably in the bearing seats, the camshaft being constructed during the assembly of the module from a support shaft which is configured at least in sections as a hollow shaft and components which are to be connected to the support shaft at predefined joining positions, the cavity of the support shaft extending at least partially under the joining positions, and the components having through openings for receiving the support shaft, comprising the method steps: a) provision of the supporting structure with the bearing seats, b) positioning of the components to be fastened on the support shaft in a predefined sequence in such a way that the components are arranged with their through openings aligned with respect to the bearing seats of the supporting structure, c) pushing of the support shaft through the bearing seats of the supporting structure and the through openings of the components, characterized in that - the components are arranged in method step b) in each case at a preliminary position which does not correspond to the joining position which the components assume on the finally constructed camshaft, and, d) after the support shaft is pushed through the bearing seats and the through openings, the diameter of the support shaft is enlarged at least in a part region of the joining position by means of an internal pressure reshaping method in such a way that, at least in a part region of the joining position, the external diameter of the support shaft and the internal diameter of the through opening of the associated component have a predefinable overlap, e) the components arrive at their respective joining positions on the support shaft by way of axial displacement of the components along the support shaft and/or axial displacement of the support shaft relative to the components, the respectively required angular position of each component relative to the support shaft being set before the displacement of the components and/or the displacement of the support shaft. a) provision of the supporting structure with the bearing seats, b) positioning of the components to be fastened on the support shaft in a predefined sequence in such a way that the components are arranged with their through openings aligned with respect to the bearing seats of the supporting structure, c) pushing of the support shaft through the bearing seats of the supporting structure and the through openings of the components, characterized in that - the components are arranged in method step b) in each case at a preliminary position which does not correspond to the joining position which the components assume on the finally constructed camshaft, and, - the components are arranged in method step b) in each case at a preliminary position which does not correspond to the joining position which the components assume on the finally constructed camshaft, and, d) after the support shaft is pushed through the bearing seats and the through openings, the diameter of the support shaft is enlarged at least in a part region of the joining position by means of an internal pressure reshaping method in such a way that, at least in a part region of the joining position, the external diameter of the support shaft and the internal diameter of the through opening of the associated component have a predefinable overlap, e) the components arrive at their respective joining positions on the support shaft by way of axial displacement of the components along the support shaft and/or axial displacement of the support shaft relative to the components, the respectively required angular position of each component relative to the support shaft being set before the displacement of the components and/or the displacement of the support shaft.