Lexus RX330 Flywheel smooths engine power by storing rotational energy for drivers to enjoy functionality and torque delivery. Across the production run, Lexus paired the RX330 clutch with a solid Flywheel that is solidly built and, on some editions, a dual mass Flywheel with the addition of internal springs for additional vibration damping. The Flywheel bolts on to the crankshaft and its inertia helps to balance the pulsed combustion strokes, its ring gear engages with the starter to spin the engine when it is being started up and its face provides the clutch friction surface. Solid versions can be resurfaced lightly when scoring does occur but Lexus often recommends replacement of any RX330 unit exhibiting heat cracks or excessive runout, especially the dual mass design whose spring pack cannot be machined. A worn Flywheel or damaged ring gear on the RX330 that has high mileage might produce grinding noises when the vehicle starts. Lexus reliability will depend on maintaining this part within specification.
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