The Kia Optima Flywheel keeps the engine running smoothly by storing rotational energy and connecting the starter and clutch in one tough steel disc. Bolted to the crankshaft, the Flywheel spins with every burst of combustion, its mass evening out power pulses to make the Optima deliver steady motion rather than jerky surges. When you twist the key, the starter gear meshes with the ring gear around the Flywheel rim, and it rotates the crank so the engine can fire up. Once the car starts moving, the clutch disc is pushed against the Flywheel face, transferring torque in the direction of the transmission. Over the years, two main styles have served the Kia midsize sedan, the traditional solid unit and the more complex dual mass version. The solid style is one piece and may occasionally be machined to eliminate shallow grooves or heat spots, and the dual mass type sandwiches spring-loaded sections between primary and secondary plates to soak up vibration but cannot normally be resurfaced if warped or noisy. Excess wear, warpage, or chipped ring gear teeth is an indication of replacement time as too much material removal would disturb balance and clutch height. A damaged dual mass damper spring can also cause vibration which is felt by the Optima driver at idle or shift points, so replacing the Flywheel unit with a fresh one restores quiet, smooth launches and protects the drivetrain of every Kia Optima on the road, keeping the reputation of Kia strong.
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