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Discussion Starter #1
1997 2.5 tdi t4 has a sqeal from 2200rpm to 2400rpm. have been told it might be the gate opening on turbo?
 

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Squeal or whistle?
Turbo is a "whine or whistle"...
Belts "squeal".....
Try removing the air filter (diver's helmet) and see if you can hear better.
 

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Def sounds like a squeal.All belts have been renewed?
There are several variants in the belts. Even vans which look the same may have a different length. It depends on who made your alternator there is only a few mm in it. etc.
Have you checked the automatic belt tensioner for strength & function? Use a spanner on the flats to test it. It should be relatively hard to move but not seized. Also try a little WD40 on the belt to see if that stops the slip. That'll point you in the right direction if the squeal goes.
 

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Remove the alternator belt....eliminates one of them....and you can run the engine without it...
If you have PS and/or aircon, will also eliminate those too.

"COULD" even be a faulty battery, and the alternator is working overtime to charge it....NOT likely, but I've had it on smaller cars/engines (Mercedes Smarts, 450 and Roadsters.....where the alternator can actually seize, and consume 80% of the engines power!!!...actually prevents you from starting those 700cc petrol engines.)
 

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Remove the alternator belt....eliminates one of them....and you can run the engine without it...
If you have PS and/or aircon, will also eliminate those too.

"COULD" even be a faulty battery, and the alternator is working overtime to charge it....NOT likely, but I've had it on smaller cars/engines (Mercedes Smarts, 450 and Roadsters.....where the alternator can actually seize, and consume 80% of the engines power!!!...actually prevents you from starting those 700cc petrol engines.)
I join this forum for some sensible help and I find you here as well:LOL::ROFLMAO::LOL::ROFLMAO:

Nice to see you are still kicking around old friend. (y)
 

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Discussion Starter #9
Squeal or whistle?
Turbo is a "whine or whistle"...
Belts "squeal".....
Try removing the air filter (diver's helmet) and see if you can hear better.
Replace squeal with chain jingling,no problem with power and it stops above 2400rpm.
 

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You might laugh but is it more of a "Tinkling" than a chain. If so it's probably turbo endfloat problems.
Grab the turbines on the cold side of the turbo and feel for any up & down or side to side movement.
There shouldn't be any but if there is you know what you are looking at.
The hot end turbines interfere with the casting if you have excess endfloat. The cold side is permanently trying to fly through the offside wing, dragging the hot side with it hence the interference.
 

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Discussion Starter #11
You might laugh but is it more of a "Tinkling" than a chain. If so it's probably turbo endfloat problems.
Grab the turbines on the cold side of the turbo and feel for any up & down or side to side movement.
There shouldn't be any but if there is you know what you are looking at.
The hot end turbines interfere with the casting if you have excess endfloat. The cold side is permanently trying to fly through the offside wing, dragging the hot side with it hence the interference.
Sounds like a turbo repair?
 
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