Truck Repair: m11 fuel injector, engine brakes, locknuts

Question
Could you tell  me how to change an injector on a m11 semi diesel and do you need any special tools.  I would really appreiciate the feedback. and is there a quick way to tell which one is bad.

Answer
Well there is not a quick way with out a device of some sort.Being a computor or hand held interface.That is probably the only "special" tool.If it has engine brakes,you need a 10mm 12 pt socket,a 12mm 12 pt socket for injector hold down bolt.A 1 5/16 to turn engine to correct position.A 7/8 wrench for locknuts on valve.Maybe a 13mm for internal wiring harness.A heel bar to get injector out with.