This is a flywheel for the Isuzu FTR model truck. The flywheel provides mass for rotational inertia to keep your engine running. Otherwise, the engine will stall when you let your foot off the accelerator. It balances the engine. A flywheel is specifically weighted to the crankshaft to smooth out the rough feeling caused by even a slight imbalance.
A flywheel is a mechanical device specifically designed to use the conservation of angular momentum so as to efficiently store rotational energy; a form of kinetic energy proportional to the product of its moment of inertia and the square of its rotational speed.
For Isuzu FVZ & FVR model trucks with the 6HK1 engine.
A wheel cylinder is a component of a hydraulic drum brake system. It is located in each wheel and is usually positioned at the top of the wheel, above the shoes. Its function is to exert force onto the shoes so as to bring them into contact with the drum and stop the vehicle with friction.
The clutch disk or clutch plate is the rotating part of the clutch, to which the friction material is attached. Equal pressure on each side of the clutch disk disengages the clutch, allowing normal operation of the torque converter