Patent ID: 8534245

Claim:
A method of assembling a valve operating system for opening and closing a poppet valve mounted on an engine cylinder head, the system having a carrier, a camshaft having an axis, at least two coaxial cams rotatable about the camshaft axis, at least two cam followers, each associated with a corresponding cam, a summation lever coupled to the followers, a control spring acting on the summation lever to urge one of the cam followers into contact with the associated cam, and a valve actuating rocker acting on the valve to open and close the valve in dependence upon the sum of the instantaneous lifts of the two cams, the valve actuating rocker being pivotably connected to the summation lever and pivoted about a hydraulic lash adjuster, the method comprising the steps of: journaling the camshaft in a carrier; tensioning the summation lever towards the carrier by coupling the control spring between the carrier and the summation lever: and securing the carrier to the engine cylinder head, the control spring and the carrier serving to maintain the position of the cam summation lever during assembly such that the valve actuating rocker is aligned to engage with the valve and the hydraulic lash adjuster.