Noisy Turbo

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Originally Posted by Roberto

I've had two noises.

The first was the turbo itself. A screaming noise under boost. Got a new turbo from UK for 450 pounds. I was advised to replaced turbo before it sprayed metal into the cylinders when the impeller disintegrated.

The second noise was a whistle under load. I thought it was rotational. Intermittent nature meant it was hard to pin down.Turned out to be manifold stud.

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Was the screaming distinctly different from the whistle? Also what other signs were there that the turbo was cactus? I am just tryimg to determine if mine is a scream or a whistle. (got me worried now)

You will get a scream if there is the slightest of leaks.

My old 300tdi was on gas and the hose was very slightly loose and it screamed up every dune on the border track and half way home, I thought it was my turbo on the way out but when checking all the hoses at home, tightened the lpg line into the turbo and no more scream.

Update:

After doing lots of research I came to the conclusion that the leak was in the intercooler pipes as this would explain the intermittant loss of power if one was breaking up on the inside. I bought a nice set of blue silicon tubes and replaced the 3 relevant pipes. Took about 2 hours so it was a pretty easy job.

Drove aorund the bloke and the noise is still there, quieter but still there. Every now and then it's really loud though.

A couple of points
1.There is a lot of black oil in the pipes from the blow pipe
2.There is also a lot of oil around the EGR (Could this have a leak?)
3.Make sure you tighten the tube coming off the turbo REALLY tight! Mine blew off after a day. Scared the S**t out of me!
4.I now think it is exhaust related but just can't see any evidence of it

Did you have the manifold "planed" ie. ground flat before you refitted it?
I had to do this on my old 360 cu inch jeep.
The exhaust guy said the all warp over time

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Originally Posted by simpin68

Turps

Can you update the thread once you replace the gaskets? Will be intersting to see what the result was.

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Yep I can do that. Well after a near catastrophe, as I forgot to re connect the oil line to the turbo. And proceed to dump 3lts of oil on the work shop floor.
But all is good. There is no noise now. Can just stand on the throttle and no whistle or high pitch whine.
Manifold needed to be machined flat. I replaced all the studs while it was off. Which is a good thing. As I broke the both studs on 1 and 5.

To a previous poster, The reason it goes away after a certain time of being on the throttle is that the turbo eventually spool's up and the pressure ins the exhaust drops off. Even though the turbo is still producing boost. But as soon as you get off the throttle then apply power again it will whine again.
When I brought my car. It was intermittent, so had only just started. Within a couple of hundred km's it pretty much did it all the time.

I thought it was the water pump or belt tensioner. Ended up being the exhaust manifold was warped and broken studs. Got the manifold machined and replaced the studs. All fixed.

The noise in mine has disappeared over summer just like it did last year, completely gone. As soon as it warmed up to above 15 - 18 degrees it stopped. I believe that mine is the exhaust manifold and that the larger temperature range from cold to running temp in Melbourne winter must warp it.

So out of hearing out of mind for the moment...until winter then I will be trying to fix it again.