CM871 Turbo on CM2250

[Rawze]

(08-14-2022 )Aleeex Wrote:  I’m not afraid to show the good and the bad. Lasted a decent amount. I think I found the issue and if I don’t forget I’ll show you why it failed when I get home

taking the turbo apart on your own throws it out of balance. That outcome shown is expected if ya ask me. You will be lucky if you do not destroy the entire engine before its over with. Where do you think those impeller shavings/pieces went?... they did not turn into fairy dust.. they ended up in your CAC and valve train!.

You will also be lucky if those tiny pieces do not make their way into the exhaust impeller of the new turbo, weakening, or destroying it too.

I HOPE that someone took apart the CAC, intake, exhaust manifold, etc.etc.etc.. and cleaned out the shavings!.

A person has to be absolutely insane to risk a $40,000 commercial engine just to save a bit of moneys by trying to fix a turbo that you should have never taken apart because of inadequate tooling or the lack of a proper balancing machine. WHY??. to save a few bucks?. .. I call that risking $40,000 dollars worth of engine just to save a few dollars ... that is What I call it.

Also,.. did you ever have your questionable delete programming looked at?.. reviewed?.

(your earlier pics of the oil in the CAC boots) ...
Just a related FYI: Oil seeping from the face of a turbo is almost always a problem with crank case pressure buildup, or the turbo not spinning fast enough at idle, creating a vacuum at the intake. The face seal in the turbo is NOT supposed to be 100% oil tight. It relies on positive pressure at its face + no Crank case pressure, to keep it from seeping oil into the CAC.

Don't get me wrong.. I am not trying to pick on anyone here.. I am making statements for others that read this thread so they don't attempt to take apart their own turbo and expecting everything will be ok. The turbine on a turbo spins at close to 100,000 rpm's.. and even the slightest imbalance at those speeds becomes hundreds of pounds of side-loading of the turbine blades.. and will cause it to eventually snap!. It is very difficult to balance a turbocharger, requires a balancing machine, once someone has taken it apart.