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Already repaired.
Little history: Been hearing a some what screeching noise that sounded very similar to a heater blower motor with bad bushings. Other symptoms were stuff like not building boost as quick after 5ish with a slight loss on the top number, truck was sluggish and seemed a little down over all on power. Would also see my boost gauge flutter a little in the double digits. There was no extra smoke. Also had no noticeable difference in mpg's but I mainly run the truck in town.
I searched through a lot of failed turbo and hat seal leaking threads, they pretty much all ended up being not very useful as they had no similarities like they had no boost registering or some catastrophic failure of a oil seal or OP did not give a good description in the first place. Finally found myself with some time and enough motivation to dig out the step stool and start poking around. Turbo was fine but I saw just a bit too much rubber sticking out from under the hat. After resetting the gasket, no more screech owl under the hood, trucks back to it's former self and then some. With the sound that was coming from through the fire wall it was hard to imagine it was just that seal making all that racket. Just goes to show, start with the simple stuff.
The gap was about 1/4 inch. Shut down engine. A 5/16 socket on a 1/4 drive wratched fixed that. Did I ever say I hate working on hot engines in the middle of the hot desert....
