6.4 turbo squeal

TheLeffert · Feb 18, 2015

I just got done installing new wicked wheels and cleaned my VGT while I had it apart. Put it all back together made sure to spin both turbo wheels, no play no catching. Installed and started the truck, It idled fine but once I increased the RPMs it started to have a loud squeal comming from the turbos. Turned the truck off and started it again and the squeal comes and goes at an idle and gets louder as RPMs increase. Any ideas what it could be ??

sootie · Feb 18, 2015

sounds like the wheel contacting the housing.

fbilly420 · Feb 18, 2015

Sounds like exhaust leak. Pre turbo

TheLeffert · Feb 18, 2015

I'm going to try and pull it back apart but when I put it in the wheels weren't rubbing or hitting anywhere. I just installed new pipes it dosent sound like its comming from there. Would the VGT have anything to do with it ? If I mess with the actuator the tone of the squeal changes.

DEEZUZ · Feb 18, 2015

Yep. Your wheel is hitting the vanes

ckrueg · Feb 18, 2015

The vanes are on the exhaust side. I'd bet the reason the squeal changes is because the rpms change when the vanes do, ie. closed vanes increase rpm

TD-5 · Feb 19, 2015

Does it sound like something mechanical rubbing or more like a pressure leak, Its possible one of the seals in the transition/crossover tube between the turbos is leaking, or the outlet boot from the HP turbo.

TheLeffert · Feb 26, 2015

Thanks for the help guys found the issue. Some how the exhaust vains are contacting the VGT vains. I unhooked the VGT and held the vains closed and the sound stops.