If you’ve never seen a diesel run away, basically what happens is the engine starts to rev out of control due to a rare fueling issue. This can cause carnage of all sorts and in a situation like this, it’s important to act fast before the engine or body parts are lost!
As you can see here, this mechanicmanages to act in the nick of time when his diesel engine runs away as he manages to cover up the turbo’s intake and cut off the air to stop the engine.
Check out the video below as this situation almost turned catastrophic. Luckily the only thing lost here was the turbo compressor wheel.