I am writing a report, where I have to compare 2 used diesel engines (large, locomotive diesel engines) and decide on a purchase. I need to physically inspect the diesel engines and compare them, and write a report. I have inspected these engines, and gone over them, but to ensure that I have not forgotten anything, I am asking people here what I should look for when inspecting. I've checked oil valve lash air filters fuel filters overall condition of body coolant levels and condition. journal bearings rings flywheels, etc... Feel free to chime in and help. Thank you.