The Mazda 3 Flywheel offers the essential advantage of even-ripple engine pulses and connects the starter, crankshaft, and clutch into a single hard-working unit. The inertia of the disc balances the discontinuous power strokes of combustion as the disc acts as a heavy spinning reservoir of kinetic energy that means the wheels are given uniform torque rather than bursts. Its rim is surrounded by teeth, which engage the starter motor to turn the engine until the ignition mechanism takes over, and the wide face provides the gripping part to which the clutch disc clamps itself every time the gears are changed. There are two predominant designs in Mazda production, namely the traditional solid steel Flywheel and the dual mass Flywheel, or DMF. The hard material is in the form of a single piece that may be occasionally lightly ground to eliminate heat scars or slight warpage, although Mazda restrictions on material removal must be followed. The primary and secondary plates are positioned in a DMF with a damping pack that is loaded in spring and filters the vibration, and a gear change will feel smoother, but this complicated design cannot be resurfaced and rattles or shudders as its internal springs wear out, so the only solution is replacement. Overscoring, hot spots, or chipped ring-gear teeth also require a new unit because Mazda requires accurate flatness of surfaces. Subsequent 3 editions embraced DMFs, and thus those wanting a Flywheel must check with their owners to know if their car has one.
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