Originally Posted by jiggs
Company truck is a 07 F-650 6.0 psd. 56.000 miles. 4 new turbos and cleaned three other times. plus few more problems. Now the ford tech said a ring in the turbo is bad and can not get a replacement must get a new turbo. I don't know what the ring is called but it is real sluggish at take off and has a miss in it. If I am idealing in nutral and push the peddal it will blow tons of white or light blue smoke.
It has been said on this site to run it like you stole it. I have been taking a back hilly road to run the crape out of it. Why is it when I run it hard in all kind of rpm's I hear the turbo stick just for a brief second. I cann't run it any harder than this and many times I have 6.000 to 8.000 lbs in the bed
As posted above, it is called a unison ring and can be purchased/replaced separately.
Long idle times, shutting it off with the EGT's too high and a leaking egr cooler are the leading causes of turbo problems.
The long idle time problem (if long idle times are a necessity in your line of work) can be remedied by installing a high idle. This is VERY VERY easy to do on an 06-up truck. With just a flip of a switch, having the truck in park and setting the e-brake, the engine would idle up to 1200 RPM. That is high enough to keep the junk from building up.
To do this mod is very simple. Just above your e-brake pedal, there is a bundle of cut wires. In that bundle, find the purple wire with a green stripe. Get fused (5 amp) 12 volt power to that wire any way you choose. (preferably a power source that is switched on with the key...or you can install a toggle switch). Once you finish this, anytime that wire is live, you set the e-brake, have the trans in park and keep your foot of the regular brake, the engine will auto-idle up to 1200 rpm. Switch off the power, release the e-brake or step on the regular brake and place the trans in gear and the idle will drop to normal.
Solving the issue with shutting the truck off with high EGT's would require a pyromoeter (egt gauge). Shut the truck down with the egt's no higher than 400°F.
The leaking egr cooler, if minimal, can cause rust to form on the surface that the unison ring slides on. This rust scale will impede the free movement of the unison ring and cause the vanes to stick. Check for a slight failure of the egr cooler by parking the truck on a good decline. Yank the egr valve out, and leave it like that overnight (a good 6-10 hours). This is also a good time to clean the egr valve, which causes its own problems if clogged up with junk.
In the morning check the hole in the intake for the presence of any liquid. The soot should be a dry, packed powder. If the soot is greasy feeling, the egr cooler has failed. Be careful to not knock off any big chunks of soot and leave it in there. Vac out any chunks you can.
Now a question: Has the VGT solenoid been replaced? This could also be a source of problems.