Turbo defective?

Hi,

"I experienced something very strange on the highway today. Three times, when I briefly took my foot off the gas, I had no power, and there was also a cloud of black smoke behind me."
Wait a few seconds and the performance was back to normal... does it definitely have to be the turbo?

In addition to that, it refused to start twice in the last 10 days.
(came on after about 10 seconds of organ music).
He had never done that before. It's possible that, on one occasion, he didn't have enough fuel.
(stood slightly crooked)

I have no idea if these two incidents are related.

Hi,

Quote:

I have no idea if these two incidents are related to each other???

rather less.

The black smoke likely indicates a problem with the EGR system. If it's producing blue smoke, you should be more concerned about the turbocharger (worn bearing, faulty seal -> lubricating oil is leaking out).

Best regards, Rainer.

I can't say for sure if it was blue; it was still a bit dark in the morning. But it wasn't white...

The rear also looks a little black.
I simply disconnected it 50,000 km ago (I removed the hose and inserted a screw into the hose).

I initially thought the KV gear might look like that, but I already have the new screw, and the injection start timing is correct (in the basic settings).

Take a look inside the turbocharger.

Okay, so disconnect the suction hose (made of hard plastic) from the top to the bottom of the turbo (there are 3 10mm screws). Then you can manipulate the shaft (rotate it, feel for axial and radial play) and potentially identify any damage. (You can insert a small digital camera to get a better view).

Perhaps the N75 (boost pressure control valve) is faulty - it might be loose or malfunctioning, causing incorrect boost pressure regulation...

m;

You're right! I hadn't even thought of that...

I'm currently at work, which is a bit inconvenient, but maybe I can during my lunch break...
They seem to be quite stiff, don't they?
The play should be minimal, due to bearing interference...

It would be foolish to do that so close to the engine rebuild.

What's up? / What's going on?
"So, you want to spin the impeller, right?"
But only at -10 degrees Celsius with very old 15W-40 oil!


It doesn't tighten properly when you turn it, but you shouldn't need a wrench to tighten it; your fingers (specifically, the small ones...) should be enough to get it into the housing.

That's where they need to go.

Okay, sorry, I described it wrong. I meant that you can turn them with your finger, but they just don't turn.