Camshaft Chain Drive
The crankshaft drives the intake camshafts and the balancer shaft using a camshaft chain (1). The camshaft is tensioned by a hydraulic chain tensioner. The tensioner is supplied with oil from the normal lubrication system. The camshaft chain is lubricated with oil via a separate nozzle (2).
The intake camshafts in turn drive the respective exhaust camshafts via their chain (3). This intermediate drive means that the outer exhaust camshafts can have smaller pulley wheels which reduces the size of the engine. The intermediate drive chains each have their own hydraulic tensioner. The tensioner is supplied with oil from the normal lubrication system.
A cover seals the area for the camshaft chain drive.
The system requires no maintenance during the entire life of the engine. Both the chain guide and the chain tensioner have plastic inserts on the treads for quiet operation.