The 6.0 Powerstroke unison ring and arm sometimes wears out and needs to be replaced. We have replacements here: 6.0 unison ring and 6.0 unison ring arm. The cause of the failure is from the 6.0 bearing housing rusting causing the unison ring to seize up on the bearing housing. For the repair to work properly, all of the rust needs to be removed before reinstalling the new unison ring and unison ring arm.
There are 2 ways I recommend fixing this: (1) remove rust and add paint or (2) remove rust and add anti-rust oil.
- The best way to fix this is to remove all of the rust and add some light coats of grill paint to the bearing housing surface. It’s also important to remove the rust from the turbine housing, and apply paint to it as well.
- The 2nd option is to remove all of the rust and add anti protective coating of anti rust oil to the bearing housing and turbine housing surfaces. Here is anti rust oil on Amazon.
Here is a video I made on rebuilding the 6.0 Powerstroke GT3782VAS turbo if you want to rebuild the turbo while you are fixing the unison ring problem.
When ordered replacement parts make sure if you changed the vanes that the vanes and turbine housing match. 13.2mm vanes fit the 2004.5 - 2007 turbo with the 13 blade turbines and 15mm vanes are for the 2003 - early 2004 turbine housings with the 10 blade turbines. If you put the 13.2mm vanes in the turbine housing machined for the 15 mm vanes the turbo will perform poorly because air is escaping around the vanes. If you put 15mm vanes in a turbine housing machined for 13.2mm vanes the vanes will be seized in the position that you assembled the turbo in causing poor performance.