The BMW X3 Flywheel is a small energy storage device that evens out power supply, assists in cranking the engine when starting, and provides a surface for the clutch to provide friction. Bolted to the crankshaft, the Flywheel's inertia smooths out the bursts from combustion. Its ring gear pairs with the starter to turn the crank, and its face has a teaming with the pressure plate that allows the clutch disc to grab or release torque. There are two main styles, a traditional solid Flywheel and a dual mass version. The solid type is a single heavy disc that can be resurfaced if signs of scoring or slight warpage are seen, but strict material limits often lead to replacement by owners. A dual mass Flywheel has the primary and secondary plates coupled with spring dampers that absorb vibration and dampen the rattle of gears, giving the BMW utility refined shifts. However, enclosed mechanisms cannot be machined and can fail internally. Replacing a Flywheel is common when the clutch surface cracks or when a DMF loses its springs, with the worn ring gear teeth also prompting swaps to ensure the X3 is still able to launch smoothly and BMW drivers can continue to enjoy their X3.
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