Crankshaft And Main Bearings
| Item Number | Description |
|---|---|
| A | Thrust bearing - position 6 |
| B | Grooved main bearing - positions 2, 3 and 5 |
| C | Main bearing - positions 1, 4 and 7 |
The crankshaft is made of forged steel and has induction hardened bearing surfaces. There are 2 types of aluminum main bearing:
- With complete oil ducts for upper main bearings 2, 3, 5 and 6
- With short oil ducts for all lower and 1, 4 and 7 upper main bearings
Due to missing counter-weights for cylinders 1 and 6 and selected counter-balancing of the entire crankshaft, main bearings 1, 4 and 7 are exposed to greater loads than the others. To reduce the load on the bearings, bearing shells with short oil ducts are used. In addition, these main bearings have their own oil circuit where the oil is not distributed on to the connecting rod bearings. The 6th main bearing also works as a thrust bearing.
A gear wheel is crimped to the rear edge of the crankshaft. The gear wheel drives the oil pump and the Rear End Ancillary Drive (READ) timing gear.
The crankshaft has a viscous vibration damper located directly in front of the connecting rod pin for cylinder 1, i.e. located in the actual cylinder block.