TUBE 3V1839 - Caterpillar

is one camshaft assembly on each side of the engine. Each camshaft is supported by nine bearings in the G3516 Engine. Each camshaft is supported by eleven bearings in the G3520 Engine. Each camshaft is driven by the gears at the rear of the engine.As the camshaft turns, each lobe moves a lifter assembly. There are two lifter assemblies for each cylinder. Each lifter assembly moves a pushrod and two valves. The camshafts are in time with the crankshaft. The relation of the camshaft lobes to the crankshaft position causes the valves in each cylinder to operate at the correct time.