Engine Operation 12 UENR4490-01 The camshaft rotates at half the engine speed. The fuel injection pump rotates at engine speed. Camshaft The engine has a single camshaft. The camshaft is made of cast iron. The camshaft lobes are chill hardened. The camshaft is driven at the front end. As the camshaft turns, the camshaft lobes move the valve system components. The valve system components move the cylinder valves. The camshaft gear must be timed to the crankshaft gear. The relationship between the lobes and the camshaft gear causes the valves in each cylinder to open at the correct time.
The relationship between the lobes and the camshaft gear also causes the valves in each cylinder to close at the correct time.