| Item name | Spare part number | Description |
| 1 | - | Drive chain |
| 2 | - | Tensioner assembly |
| 3 | - | Equalizer assembly |
| 4 | - | Chain guide |
A 60-degree V6 engine is often referred to as internally balanced because first-order forces can be compensated by crankshaft counterweights. However, in the V6 4.0L engine, second-order unbalanced forces are created at double the crankshaft speed.
The V6 4.0L engine has a unique counter-rotating counter-rotating balance shaft to ensure smooth operation. It is driven by a chain from the crankshaft and rotates at twice the speed of the engine crankshaft. The shaft creates a second-order counterforce that eliminates internal imbalance.
The balance shaft is located at the bottom of the cylinder block on the right side and is fixed with 4 bolts. Since the unit is close to the engine oil level, it is enclosed in a steel tube to prevent oil aeration. The balancing system shaft is attached to the engine as a complete assembly, including an integrated gear and lubrication system. The transmission ensures that the shaft rotates in the same direction as the unbalanced force.
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