Description And Operation
The 2.4L Multiair engine uses a Single Over Head Camshaft (SOHC). The camshaft is in the standard position of an exhaust camshaft in a Dual Over Head Camshaft (DOHC) engine. The camshaft has six bearing journal surfaces and three cam lobes per cylinder. The camshaft is built up on a hollow tube with cam lobes, thrust rings, a camshaft position sensor pick-up wheel, and end caps pressed into position. The front end cap includes the camshaft sprocket mounting. The number 4 bearing surface has thrust rings pressed onto the tube on both sides of it to control end play. The rear has a camshaft position sensor pick-up wheel and also drives the vacuum pump.
The camshaft is driven by the crankshaft via a drive sprocket and a chain. The camshaft has precisely machined lobes to provide accurate valve timing and duration.