Dynamic Balancer System
| ITEM | DESCRIPTION |
|---|---|
| 1 | Crankshaft rear dynamic balancer drive sprocket |
| 2 | Idler sprocket |
| 3 | Rear dynamic balancer |
| 4 | Crankshaft timing chain sprocket |
| 5 | Accessory drive belt tensioner |
| 6 | Front dynamic balancer |
| 7 | Auxiliary drive chain |
| 8 | Oil pump sprocket |
| 9 | Auxiliary shaft sprocket |
| 10 | Auxiliary shaft |
| 11 | Drive chain |
Dynamic engine balancing is performed by 2 weighted dynamic balancers, located at the front and rear of the cylinder block. The dynamic balancers neutralize vibrations created by the engine's rotating components.
The front and rear dynamic balancers comprise of a sprocket with an offset weight.
Both dynamic balancers are installed with 2 needle roller bearings. A threaded shaft passes through the needle roller bearings and bolts through the rear main bearing cap for the rear dynamic balancer and idler. A threaded shaft passes through the needle roller bearings and screws into a threaded hole in the front main bearing cap for the front dynamic balancer. A shoulder on the shaft maintains the correct lateral position of the dynamic balance. Thrust bearings on either side of the dynamic balancer control lateral movement.
The rear dynamic balancer is driven by a dedicated drive chain which is driven by a sprocket which is integral with the crankshaft. An non-weighted idler sprocket, supported on needle roller bearings, is installed in the same way on the opposite side of the crankshaft main bearing cap. The drive chain connects the 2 sprockets and the drive gear on the crankshaft.
The front dynamic balancer is driven by the auxiliary drive chain, which also drives a camshaft used to operate the 2 high pressure fuel pumps. The auxiliary drive chain is driven from the crankshaft sprocket, and also drives the oil pump.
The dynamic balancers rotate at crankshaft speed in opposite directions. The weights, which are the same size, rotate to counteract vibrations caused by the engine in the horizontal and vertical planes.
The auxiliary shaft is located on a carrier with 3 machined bosses and secured with 8 bolts. It has 2 cam lobes, with each lobe operating a high pressure fuel pump, via a tappet. The drive sprocket is a press fit on the shaft and timed with the cam lobes to match the pump delivery strokes.
For additional information, refer to: FUEL CHARGING AND CONTROLS