Description And Operation: Engine: Description: Crankshaft
| ITEM | DESCRIPTION |
|---|---|
| 1 | Thrust washers (2 off) |
| 2 | Main bearings - Upper (5 off) |
| 3 | Crankshaft |
| 4 | Crankshaft pulley/Mass damper location |
| 5 | Roll pin - Crankshaft pulley/Mass damper |
| 6 | Main bearing - Lower (4 off) |
| 7 | Main bearing - Rear lower |
| 8 | Dynamic balancer drive gear |
| 9 | Timing chain drive sprocket |
| 10 | Roll pin - Drive plate |
The crankshaft is manufactured from forged carbon steel C38 MOD with induction hardened main and large end bearing journals. The fillets of the main and large end bearing journals are fillet rolled to improve the strength of the crankshaft.
A five counterweight design has been used to reduce bearing loads as well as to give class leading vibration levels.
An oil groove in the upper half of each main bearing transfers pressurized engine oil into the crankshaft for lubrication of
- The main bearings
- The connecting rod bearings.
There are two different lower main bearing designs. The first four lower main bearings do not have oil grooves. The fifth (rear) lower main bearing has partial grooves at each end.
The crankshaft assembly comprises the bare crankshaft and a dynamic balancer system drive gear. This gives direct drive at a ratio of 2:1 of the two counter rotating dynamic balancers.
Two individual thrust washers are located on either side of the central main bearing journal panel of the cylinder block to control crankshaft end float.