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Overhead camshaft

Overhead camshaft Cam Camshaft Bucket tappet Valve Valve spring Cylinder Piston Connecting rod Crankshaft Crankshaft sprocket Toothed non-stretch drive belt Idler wheel for tensioning belt Camshaft sprocket

In this design the overhead camshaft is driven by an internally toothed belt, and the cam lobes act directly on tappets mounted over the valves.