The Flywheel is a heavy metal disc that attaches to the crankshaft and stores rotational energy, smooths out engine pulses, and helps crank the engine during start-up. It provides the surface that allows the clutch to grab. The Flywheel is attached to the rear of the crankshaft and spins every time the engine runs. Its weight evens out power flow so the SUV feels steady at every rpm. Turning the key engages the starter gear with the Toyota 4Runner Flywheel ring gear, which rotates the crank, thus drawing in air and fuel and igniting them. Once in operation, with the clutch disc clamped between the Flywheel face and pressure plate, the driver can connect or disconnect the gearbox without any harsh jerks. Throughout much of the history of the Toyota 4Runner, there have been two basic designs of Flywheel. One is the simple solid piece and the other is the more complex dual mass design. The latter splits the disc into two pieces, a primary and a secondary. Between the two discs is a set of spring dampers to soak up vibration. When the face of a solid unit becomes scored due to excessive clutch heat, it can usually be lightly resurfaced. However, many of the dual mass units applied in later model Toyota 4Runner must be swapped when their internal springs wear out or when runout exceeds limits because refinishing could upset their balance.
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