It works good from start up for about 10 min then it loses power and smokes a lot. There is a whistling noise from the first gasket after the turbo. The turbo has been replaced. Any suggestions would be appreciated.
It's very simple. Had the exact same problem and symptoms on my 8410 tractor. The air coming of of the turbo going into the motor is leaking out somewhere (whistling sound). Fix the leak and your problem will be solved. Chances are there was nothing wrong with turbo. Good luck.