To use a metaphor, a truck engine is like a precision factory.
Fuel is the raw material, cylinders are the machine shop, pistons are the workers, crankshafts
the crankshaft is the production line, and the other systems are auxiliary facilities that work together to make sure the work together to ensure that the engine runs efficiently.
Main engine components: cylinders; pistons; crankshaft; connecting rods; valves; fuel system; ignition system.Fuel system; Ignition system; Cooling system; Lubrication system; Starting system; Exhaust system and so on.