The Nissan Sentra Flywheel stores rotational energy to smooth engine pulses, making takeoffs and gear changes feel steady and predictable. This Flywheel, bolted to the crankshaft, has a ring gear which the starter motor engages to spin the crank when the key is turned. When the engine fires, the inertia of the Flywheel evens out power delivery, while the face acts as a friction partner to the clutch disc and a mount for the pressure plate. The Sentra models primarily follow two types of Flywheel, which are traditional solid and the complex dual mass Flywheel. The solid unit is a single disc which can often be resurfaced if minor heat checks appear. Meanwhile, a dual mass version sandwiches its primary and secondary sections around spring damping hardware to hush vibration. As this version can't be machined and may fail internally, a complete replacement is the only option. The presence of a ringing or grinding sound at start-up may be heard by drivers. This means that there is a chip on one or more teeth of the ring gear. The optimal advice is a Flywheel swap or a swap of just its gear. No matter the type, Nissan places strict limits on material removal, so if there is excessive scoring, cracks, or runout, a new part will typically be installed on every Nissan Sentra.
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