Somewhat related, there's a series of German videos made for kids that show how a car is manufactured. It's mostly the bodywork and assembly, not engine stuff, but it's still a good overview. If you're interested in this stuff, it could be worth watching, even if you don't understand German.
Autobau Part 1: https://www.youtube.com/watch?v=vVNX--ROvtU
Autobau Part 2: https://www.youtube.com/watch?v=on-PhI5Rlyc
Autobau Part 3: https://www.youtube.com/watch?v=XeqY03HUmlU
Autobau Part 4: https://www.youtube.com/watch?v=l3cpM6jbqNA