Isx15 2250 turbo squeal

[JasonD5746]

Hey guys.. truck has boost, pulls strong, no codes.. but bad squeal on hard acel, and above 20psi boost. Sounds like a balloon releasing air slowly... You know, when u do that as a kid to make noise..
Put boot on turbo, hecked for boost leak at 40psi shop air, no squeal. Turbo seems to have normal amount of play, not leaking any oil into air charge. My 99th guess is that leak is between x manifold and turbo. Anything else that I should check.? I'm waiting for truck to col down atm. Ty

[tree98]

I think your 99th guess will be correct. You could always pressurize the whole engine and find it like that.

[JasonD5746]

On closer look, I see aluminium powder on turbo vane...

[tree98]

Uh oh

[Moose]

(12-02-2019 )JasonD5746 Wrote:  On closer look, I see aluminium powder on turbo vane...

Pull the compressor housing off and post some pictures of both ends. I'm leaning towards CAC boots or manifold/turbo mtg gasket.

[JasonD5746]

Yea, it's the gasket. One rear nut was missing, other was finger tight. One front nut was tight, other looks like it was replaced with a bolt which somehow was bent. Had to use universal wrench to get it off. Anyways, metal gasket was blown to the rear(backside next to engine). I have a few specs of aluminium powder on impeller. This thing has 575,000 on it. Go ahead and replace turbo while it's off or run it..?

[tree98]

(12-02-2019 )Moose Wrote:  

(12-02-2019 )JasonD5746 Wrote:  On closer look, I see aluminium powder on turbo vane...

Pull the compressor housing off and post some pictures of both ends. I'm leaning towards CAC boots or manifold/turbo mtg gasket.

^^^^^Do this first^^^^^