The flywheel connects the engine to the clutch assembly and stores rotational energy to smooth engine pulses. Dual-mass flywheels (DMF) have become standard on modern diesel and turbocharged engines to reduce drivetrain vibration. A worn DMF causes rattling, vibration, and clutch judder. At CarParts247 we stock flywheels from LuK, Sachs, and Valeo.
DMF failure develops gradually. Early symptoms are subtle rattles at idle that progress to severe vibration, gear noise, and clutch problems.
DMF replacement should always be done alongside the clutch kit, as the labour is the same job. Some owners choose to convert to a solid flywheel, though this increases drivetrain noise and vibration.