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Flywheels rarely go bad. A flywheel is simply a balanced disc that helps keep the engine in balance and smooths it out. It is also a component where the drivetrain/transmission connects to the engine.

I have seen a few crack but it is rare. If that were the case, it would knock lightly, mostly at idle.

The gear for the starter to engage in sometimes has a problem with broken or rounded off gears or the bolts attaching it to the torque converter/drive train components can come loose causing a knocking sound.

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