Why did you do the head gasket? Daft question but my mates audi dropped a valve and it ended up in the hot side if the turbo,

Can you freely turn the turbo?
Have you out the oil lines back on correctly?
Have you got the inlet and out let crossed on the turbo?
Have you reset the rockers / tappets?
When you have your foot down does it puff black smoke like its trying to spool the turbo?
Have you checked your pump timing is still correct?
 
warrior said:
Why did you do the head gasket? Daft question but my mates audi dropped a valve and it ended up in the hot side if the turbo,

Can you freely turn the turbo?
Have you out the oil lines back on correctly?
Have you got the inlet and out let crossed on the turbo?
Have you reset the rockers / tappets?
When you have your foot down does it puff black smoke like its trying to spool the turbo?
Have you checked your pump timing is still correct?
Click to expand...

Ok, so answers:
Yes
I did't remove the oil pipes
Don't think inlet and outlet are crossed!
I have set valve clearances, how do I reset rockers?
Can't really see much smoke when I drive it, seems ok.
Not sure how to check the timing, what do I check?

The head gasket was changed as there was a split in the gasket right at the back and it was making a noise. Nothing major, wasn't using any oil or water.
 
Rocker and valve clearance is the same,
It would be hard to cross the turbo pipes

YouTube 300 tdi timing it would be easier for you to see than me explain,

Just a thought, it's not your handbrake or brakes that seized is it with it been stood?

If you start it up engine running not in gear and rev it does it make the noise, and can you here the turbo?

If you carnt here it then remove the outlet of the turbo and try again you should here it this time, you would also be able to see the turbo spinning,
 
Last edited:
warrior said:
Rocker and valve clearance is the same,
It would be hard to cross the turbo pipes

YouTube 300 tdi timing it would be easier for you to see than me explain,

Just a thought, it's not your handbrake or brakes that seized is it with it been stood?

If you start it up engine running not in gear and rev it does it make the noise, and can you here the turbo?

If you carnt here it then remove the outlet of the turbo and try again you should here it this time, you would also be able to see the turbo spinning,
Click to expand...

Nah, it shouldn't be the handbrake, it goes fine and does accelerate, it just seems that the turbo doesn't kick in when it is supposed to. Either that or something is limiting the power higher up the rev range. Will try it tomorrow without an air filter to see if that is the issue.

No, it doesn't make the noise when it is not driving for some reason.

I'll have a look at timing, yeah I did set up the valve clearances.

How much air is the turbo supposed to kick out? It blows out quite a lot of air, and if I disconnect the intercooler top hose it blows the same amount there, which suggests the intercooler isn't blocked.

Will bring it down from the farm tomorrow after work so I can try out some stuff.
 
Just driven it back from the farm. It mostly drives ok, if a bit slow. but when I upped the revs there was the normal grinding noise, then a screech of some kind, like when an electric motor is screeching. Do you think this could be the turbo after all?
 
I would have thought the turbo would self destruct, try disconnect the turbo and go for a quick drive and see if the noise happens,
 
So, have just taken it a quick drive without the turbo connected. It is now obvious that the turbo does do something, as it was a lot slower without it.
I could also hear the turbo whistling quite loudly, but not the grinding noise.
I put the turbo back on, and it seems to have grown to a metallic squealing noise now. And there was some oil sprayed out while the turbo was disconnected. Not much though.
Any other thoughts?
 
Just been outside and had another mess around with it. There is the very smallest of movements on the bearings, would that be enough to make the noise?
If the turbo has gone now, I am seriously unlucky...
 
I would not like to say if its the turbo or not, the fact you can here it whistle is good and there was no noise without it connected,

Daft but you sure its not a intercooler pipe rubbing a belt maybe? My mates 200 does this sometimes, might not have done it with it not connected cause you had moved the pipe away, and it's only catching a full throttle when the engine moves slightly,
 
Warrior, what lubricates the vein in the turbo? The squealing noise sounds like a baring that's running dry. Don't hold out much hope if it has as the damage may have already been done.
 
hard to say from posts on this thread ,but id leave inlet to turbo pipe off and try it ,check the other hoses , for a turbo to screech providing it has oil feed ,it has to have turbine blades catch the housing not difficult to see damage to both ,split /damaged hoses can cause similar noise
 
Thanks for taking the time to help. Its got new intercooler pipes. Doesn't seem to squeal with the intercooler not connected which is weird.
Lots of oil about so not sure its lack of flow. Unless there is something else further in squealing.
Will get a mirror in the morning and see if I can see if there is any damage. I'm tempted to get a turbo repair kit and take the turbo off.
 
mick the builder said:
Warrior, what lubricates the vein in the turbo? The squealing noise sounds like a baring that's running dry. Don't hold out much hope if it has as the damage may have already been done.
Click to expand...

The fact it's not making the noise with the hose's off would suggest its not oil starvation and he said its passed a bit of oil aswell, and it should have brought the light on if there's no oil pressure,

If the impellers are rubbing the housing and stalling it would loose boost, and puff black smoke,

James, try move the impeller the way it had play and try turn it see if it catches,

If it was mine I'd be looking at what I had removed and refit to do the head gasket.
 
james6546 said:
Thanks for taking the time to help. Its got new intercooler pipes. Doesn't seem to squeal with the intercooler not connected which is weird.
Lots of oil about so not sure its lack of flow. Unless there is something else further in squealing.
Will get a mirror in the morning and see if I can see if there is any damage. I'm tempted to get a turbo repair kit and take the turbo off.
Click to expand...

Ok im no expert but just throwing some ideas into the mix. Before you start poking in the turbine, be aware that if you damage or even slightly bend one of the viens, it will self destruct when it gets up to speed.
Just a thought, im assuming it has a baring on the front and back of the turbine. Im also assuming that if you have the intercooler conected ,the turbine is pulling air so is being forced forward. As you say it dosent squeal when intercooler is dis connected, could it be that the pressure is off the front baring?? Maybe its the front baring thats damaged.
Apologies if this is all BS.:eek:
 
That would make sense, yes.
I will have another play with the turbine in the morning, its pouring now!
In terms of the turbo I didn't really remove anything. I took the intercooler off and cleaned it, and took the air box and all the piping out.
I left the manifold and turbo in place.
How easy would it be to take the turbo off to diagnose it better?
 
james6546 said:
I took the intercooler off and cleaned it
Click to expand...

Could the intercooler be damaged? If compressed air is escaping through the intercooler, that would explain the reduced power and I would imagine it would make a noise as well, but I would not like to speculate how it would sound.

How did you clean the intercooler? Recommended method is swilling it out with white spirit and allowing to dry.
 
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