Possible turbo bearing screech HELP!!

Hi guys
I have a 2000 GUII Patrol ZD30 auto and I'm having some trouble with a noise that sounds like it's coming from the turbo. It happens when the car is under boost and acceleration generally above 2000 rpm it sounds like really bad belt screech. I've read that it might be gaskets but I don't know. When I bought the car it made the noise for a while then it kind of faded away and the other day I put a boost controller on it and since then it has been making the noise.
Has this happened to any of you if so what was wrong.

Really hoping it's something small like a gasket or maybe the egr.
Any input is greatly appreciated
Cheers Jack

D'day mate, having just had this happen on a Merc Vito work van, I suggest you get it looked at as quickly as possible. It may just be sucking air somwhere but if the bearing is about to fail, the resulting disintegration can do heaps of bad thing to the motor hope it is a laek somewhere.

Have you noticed any decrease in power when this started?

Since I've owned the car it hasn't really changed. Only had a power increase since putting the boost controller on. And I haven't noticed any loss in power.

Not sure if the guy before has loss of power though

It doesn't lack on power when it is screeching. I took it to a mechanic and he says it's the turbo but to be honest with you I don't really wanna fork out 2500 or so for a new turbo I wanna try everything else first

Could be just air leaking from the IC or bad hose connections between the turbo, IC and engine intake. Tighten all your hose clamps (the clamp at the turbo output is especially difficult to tighten) and look for oil weaping around the intercooler, which indicates leaks.

All the hose clamps are tight and the ic isn't leaking. The noise is coming almost exclusively from the turbo.

Any other ideas

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Originally Posted by JackCollo

All the hose clamps are tight and the ic isn't leaking. The noise is coming almost exclusively from the turbo.

Any other ideas

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Take the inlet hose off from the airbox to the turbo compressor and feel if the shaft of the turbine has play and also inspect it.

Take a good photo even and put it on here.

Alright will do

My money is on a warped exhaust manifold. Quite common with these motors. Get a bright torch and check, if you can, around where the manifold meets the head and check for any soot spots.
Just thought. Is the intercooler the factory one? If so, remove it and check it for leaks, as this is also another common issue, factory leaks on the intercooler. Oily residue on the core of the cooler is a good tell tale sign of a holed IC. The noise just could be the boost leaking out.

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Originally Posted by mudski

My money is on a warped exhaust manifold. Quite common with these motors. Get a bright torch and check, if you can, around where the manifold meets the head and check for any soot spots. Just thought. Is the intercooler the factory one? If so, remove it and check it for leaks, as this is also another common issue, factory leaks on the intercooler. Oily residue on the core of the cooler is a good tell tale sign of a holed IC. The noise just could be the boost leaking out.

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Definitely possible too mate. Exact same thing happened on our work zd30 as well and it was a split IC too.

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Originally Posted by AB

Definitely possible too mate. Exact same thing happened on our work zd30 as well and it was a split IC too.

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I had the same thing happened to mine

Ok so I've checked the intercooler and there is nothing there. I've checked the air box. I've also check the turbo compressor wheel for any play and there is nothing. I decided to dial back the boost setting to a lower setting and the screech has stopped. But as soon as i dial the boost back up again the screech returns.
I'm starting to worry that it's the exhaust Side of the turbo.

Any other ideas.
Is it painful to pull the egr off the car.

Cheers

How did you check the intercooler? And also look at theexhaust manifold. Like i said. Its not uncommon for thess to warp.

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Ok so just an update. Last night leaving work I decided to turn the boost down on my hpd boost controller and after I did the the screech did not return. Being inquisitive I pulled over and turned the boost back up again. Sure enough under acceleration and revs at about 2000/3000 the screech came back. Pulled over and turned it back down.

I also pulled all the intake pre turbo off to see if it was leaking and found nothing.
Also checked the turbo to see if there was any movement which there wasn't.

Hopefully someone else can help but I would 100% confirm no leaks by running the engine and mix up some detergent and smear bubbles all over the exhaust manifold, IC and IC lines to eliminate that once and for all.

I reckon I'll try that tomorrow.

I feel like it's the egr but have no idea to be honest

https://youtu.be/qFTuwr-wHsU

Here is the noise I'm talking about guys

Remember a mate having a funny sound like that on his GTR.
Have a look at the crank case vent hose/system.
If it has a blockage OR is over restricted somehow (eg-poor designed,restrictive catch can) you can get a noise like that, & it does sounds like it comes from turbo.

Going by description, boost created noise, keep looking with the soap mix.
good luck.

Just had same problem about a month ago. .warped exhaust manifold common problem when i told our mechanic he said it straight up..shine a torch on the 3 bolt at the top and you will probably see soot

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How much soot are we talking I've breifly looked over and haven't seen anything unusual. I'll upload a video of the manifold and what not and you can tell me what I'm missing.

Did anybody mention a warped EGR pipe at the back? Had that on my 3L CRD. It's common. But unsure if your older Di models have that pipe? @mudski ??

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Originally Posted by Hodge

Did anybody mention a warped EGR pipe at the back? Had that on my 3L CRD. It's common. But unsure if your older Di models have that pipe? @mudski ??

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From my knowledge, a warp EGR pipe is pretty much unheard of in the Di's. Could be a split in the EGR pipe, but I still reckon its either a warped exh manifold or a holed intercooler.

Fair enough. Mine was split right at the back in a bastard of a spot. And like OP's symptoms, only screeched it's head off above very specific PSI, which was around 12 or so from memory ...

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Originally Posted by Hodge

Fair enough. Mine was split right at the back in a bastard of a spot. And like OP's symptoms, only screeched it's head off above very specific PSI, which was around 12 or so from memory ...

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Yeah more common on the CRD's as the exhaust does run a little hotter on a CRD to the Di. The symtoms the OP is having do point to intake, post turbo. or the exhaust manifold.

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Originally Posted by JackCollo

How much soot are we talking I've breifly looked over and haven't seen anything unusual. I'll upload a video of the manifold and what not and you can tell me what I'm missing.

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i meant the second one at the top,the black is slight,but it happens when the turbo boosts,plant the foot and you'd hear it...drive like a nanna nothing...take it somewhere and just tell them you think it's the manifold gasket,someone that fixes nissan they'll be straight onto it..
there is only a faint sign of black,but they diagnosed it straight up

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Originally Posted by JackCollo

It doesn't lack on power when it is screeching. I took it to a mechanic and he says it's the turbo but to be honest with you I don't really wanna fork out 2500 or so for a new turbo I wanna try everything else first

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Could it possibly be the turbo?

J/K

You say it's only started since you put the boost controller on it, how much extra boost are you flowing with the boost controller? You might be pushing your turbo beyond it's safe working limits.

Not much at all actually just enough till I can get it tuned by someone

How much is not much?
I think you are just hearing the sound of boost if you have an exhaust leak it going to be there regardless of the boost setting how ever if its a leaking IC you will hear it more as you up the boost