How heavy is a 5.9 cummins diesel?

The weight of a 5.9 Cummins diesel engine varies depending on the specific application and year of manufacture. There isn't one single weight. It can range from roughly 600 to 800 pounds (272 to 363 kg). This is just an estimate, and the actual weight could be higher or lower. To get a precise weight, you would need to consult the specifications for the specific engine model and year.