Turbo trashed?

[spiffy926]

I finally got a chance to look into the oil consumption issues of my newly acquired 760. Sure enough, the compressor wheel has massive up and down movement. I've never seen anything like it, it moves probably a quarter inch.
Now I have to assume that the grinding type noises I heard a couple times on the drive home was the sound of the compressor wheel scraping on the sides of the turbo bore.
Should I even bother with a rebuild? Or should I assume that the turbo housing its self has sustained damage and just replace the whole thing?
Has anyone been so foolish to let a turbo get to this point? And had you been able to fix it?

I'll be pulling the turbo off the engine sometime in the coming weeks, and I'll be able to inspect the damage further.

[Ekus]

If that grinding sound is coming from your turbo, stop driving that thing!
Hard to tell without having parts removed, but normally a new shaft, bushing and comp wheel will be necessary, and a turbo balance after that. Way cheaper than a new one.
Remove that turbo and make a close up inspection of the parts and housing, surely housing is in good working order.
Good luck!

[spiffy926]

Thanks for the tip Ekus I hope it only needs a rebuild. Luckily the maiden drive from Maine was all the engine had to suffer through. Since then It has not moved until I get everything worked out.

So far I have test run the engine with the turbo disconnected, to verify that the plumes of blue smoke I witnessed on the drive home was indeed solely from the turbocharger. I was worried about poor compression because the engine also is hard to start. But sure enough, nothing but sooty diesel smoke once I had it running N/A.

Now I have the peace of mind to move forward with the project, which means I'll finally get that turbo off, and check it out.
I'm also going to change the fuel filter and clean out the injection system to try and remedy the hard starting.

[v8volvo]

That's probably only the second or third turbo failure on one of these engines I've ever heard of. Not that it can't happen but they seem to last virtually forever, for one reason or another.

Good news is that that means there are plenty of used spares around, making that probably your cheapest option (vs rebuilding), and you'll have every reason to expect that a used replacement will work fine. I have half a dozen of them kicking around that I'll probably never end up using.

PM me if you might be interested in one...

[spiffy926]

Cool thanks, I'll let you know.
The PO told me he found a mouse nest in the turbo so... I guess I shouldn't be surprised

[spiffy926]

So I just installed the new turbo, and at first it seemed to run great. It started easier than ever, and didn't seem to be burning any oil.
But then after I let it warm up for 20 mins or so, I tried driving it a little.
After a couple full throttle runs, to test how the boost was building, it hung at 4k rpm, and kept on dieseling. I had to chunk it into 4th to kill the engine.
It never really ran away, but rather just hung in the higher rpms.
I would describe the smoke coming out of the tail pipe to be white, maybe a tad blue-ish but also keep in mind the exhaust system is thickly coated with oily sludge.

Now I am worried my compression might be suffering.
I find it unlikely that the IP is mis-adjusted because I never had any issues of this nature running the old turbo, or running N/A.

Is it possible an intake, or exhaust leak could cause run-on?
I had to re-use gaskets when I switched the manifold and turbo.

Also would it be worth the time to flush out the fuel system before I investigate compression issues? I should also note that you can visibly see smoke coming out of the breather, and the oil cap will hop a little bit.
I'm not sure to what degree these two things are normal.

Any advice will be appreciated, thanks.