As stated above I have a 2008 case 450 series 3 with the Iveco 445 engine with 2400 hours. When I first bought the machine it smoked diesel rich white smoke during warm up then would mostly clear up after I ran the machine. Over time this issue has gotten progressively worse to the point where it won't rev up without spuddering and never stops smoking. Thinking it was a fuel or air issue I started by changing all filters and fluids no change. I then changed the lift pump and the suction lines to the lift pump. Still no change so I bought new injectors which had no effect and finally I had the Bosch fuel injection pump rebuilt which resulted in no change. What am I missing? Things I have checked and to be noted. The turbo shaft is tight and spins freely with no oil on the intake side. The Engine block vent valve is open and working as it should. The machine does not use oil and the smoke isn't blue or smell like oil. If this was your machine what would be your next step? Thinks to check? Thanks in advance