Camshaft, Engine: Operation
- The camshaft is driven by the crankshaft via drive sprockets and belt. As the crankshaft turns, the timing belt turns the camshaft. The camshaft has precisely machined lobes to provide accurate valve timing and duration.
- The exhaust camshaft lobes are located directly over the exhaust valves and are actuated through bucket style hydraulic lash adjusters.
- The third lobe on the camshaft functions as an intake lobe. This lobe drives a roller follower rocker arm mounted to the variable valve actuator assembly. The rocker arm drives a pumping element within the variable valve actuator that creates oil pressure needed to open the intake valves.
- The camshaft is supported by five bearing journals. The front and rear bearing journal caps are located to the camshaft housing with dowel pins.
- Camshaft end play is controlled by two thrust walls that border the nose piece journal.
- Camshaft bearing lubrication is provided via a oil supply passage through the camshaft bearing housing and from an orifice in the rocker arm ball socket.