Meccano 4-Cylinder Machine with working pistons, camshaft and valves

This is the model of a four-cylinder combustion engine. Like its large prototype, it has a crankshaft with four cylinders, an overhead camshaft driven via a chain. There are also four valves on the intake side and four on the exhaust side, which are driven by the camshaft via rocker arms. A geared motor disguised as a Dynamo provides the drive.