Crankshaft And Balancer Shaft
- Balancer shaft
- Crankshaft
The crankshaft is made of carbon steel with a nitride hardened surface. The crankshaft bearings have separate caps, the intermediate section of the cylinder block makes up the lower half of the bearing. The crankshaft has five main bearings where the third also acts as an axial bearing. The main bearings are aluminum bearings.
The crankshaft has offset pins. Two connecting rods are mounted on each crankshaft pin with an internal offset of 30°.
Big-end bearings and axial bearings are lead-free.
Two splined joints are located at the front end of the crankshaft, the inner one drives the oil pump. The timing chain gear is located on the outer joint.
The crankshaft has a three part vibration damper consisting of a hub and two active masses. The hub is located between the inner and outer masses. The crankshaft vibration damper drives the auxiliary belt.
The 60 degree angle between the two cylinder banks means that the engine is equipped with a balancer shaft. This is to give the vibration characteristic which corresponds to a 90 degree V8. The balancer shaft is located in the center of the engine, above the crankshaft. The balancer shaft rotates in the opposite direction to the crankshaft. It is driven by the crankshaft using the same chain that drives the intake camshafts. The balancer shaft rotates at the same speed as the crankshaft.
The balancer shaft is made of spherolitic cast iron (nodular iron).