Technical 2.8 2001 whistle

[Adie1023]

Hi All thanks for having me. I have a fiat ducato based 2.8 2001 hymer b584 have changed so many parts now losing the plot when driving at 2000 revs in 3rd 4th 5th gear all good as long as just tickling the accelerator as soon as apply pressure and go over 2100 revs I get like a loud whistle chirping chattering sound through the air vents as soon as ease off the noise goes. New timing belt water pump new clutch new crankshaft pulley new alternator new starter new exhaust new rear shoes new belts new air intake to turbo pipe anyone any advice please

 

[Eternal Optimist]

...new air intake to turbo pipe...

I'd be checking here first.

 

[bugsymike]

As @Eternal Optimist suggests check air intake, then as a test, take turbo pipe off at inlet manifold so it is just blowing free air under bonnet and try vehicle up the road, performance will be poor, but see if noise goes away.
Possible cause, leaking turbo hoses up to inlet manifold split/damaged intercooler, or maybe damaged turbo it's self.

 

[Communicator]

As a turbo is mentioned, the engine will be either a 2.8idTD, or a 2.8jtd. The air inlet systems for both engines are essentially identical.
I doubt that the problem will be with the replaced turbo inlet hose, but as Mike suggests, careful investigation of the intercooler and the connecting hoses that run across the front of the engine may reveal a leak or split.

 

[ZaphodB]

when driving at 2000 revs in 3rd 4th 5th gear all good as long as just tickling the accelerator as soon as apply pressure and go over 2100 revs I get like a loud whistle chirping chattering sound through the air vents as soon as ease off the noise goes.

You've def. got boost, but a small amount is leaking out hence the whistle.

 

[Adie1023]

You've def. got boost, but a small amount is leaking out hence the whistle.

Any idea where it would leak from as changed the on from the air intake box there is like a small u shaped one on turbo if you know what I mean thanks.

 

[ZaphodB]

Anywhere post-turbo output.

2100 rpm or thereabouts is where turbo boost kicks in, which is why you can't hear it until you're on boost. There's no real pressure 'til then.

 

[Adie1023]

As a turbo is mentioned, the engine will be either a 2.8idTD, or a 2.8jtd. The air inlet systems for both engines are essentially identical.
I doubt that the problem will be with the replaced turbo inlet hose, but as Mike suggests, careful investigation of the intercooler and the connecting hoses that run across the front of the engine may reveal a leak or split.

Hi as a total novice which pipe would that be i think mine is jtd is it at top of engine or bottom thank you.

 

[Adie1023]

As @Eternal Optimist suggests check air intake, then as a test, take turbo pipe off at inlet manifold so it is just blowing free air under bonnet and try vehicle up the road, performance will be poor, but see if noise goes away.
Possible cause, leaking turbo hoses up to inlet manifold split/damaged intercooler, or maybe damaged turbo it's self.

Hi just took pipe off air intake box and went for a drive whistle is still there hoping it's not new turbo need but running out of ideas and my knowledge is very limited thank you

 

[ZaphodB]

Hi as a total novice which pipe would that be i think mine is jtd is it at top of engine or bottom thank you.

Any of the blue area , ( the area marked "compressor inlet" is ambient air pressure - the air you breathe freely)
anything in blue beyond the turbo (if the turbo is boosting/on boost **) is pressurised air, so the slightest airleak here will result in squeal/whistle


** i.e. when you're pushing the acc. pedal after 2100rpm ish

 

[Adie1023]

View attachment 473469

Any of the blue area , ( the area marked "compressor inlet" is ambient air pressure - the air you breathe freely)
anything in blue beyond the turbo (if the turbo is boosting/on boost **) is pressurised air, so the slightest airleak here will result in squeal/whistle


** i.e. when you're pushing the acc. pedal after 2100rpm ish

Thank you for informative reply will try and see if I can suss it so maybe not a bad turbo just a leak somewhere

 

[Communicator]

Hi as a total novice which pipe would that be i think mine is jtd is it at top of engine or bottom thank you.

Either of the two pipes (reinforced rubber hoses) running across the upper front of the engine. There is a third short section of hose behind the intercooler roughly below the power steering reservoir, if that has not been moved by Hymer. In all six connections from reinforced rubber to metal, which are possible leak points. In addition hoses themselves can split. On my 2.8jtd the four clips closest to the intercooler were not the standard worm drive (Jubilee) type. These clips require a speciel tool. I have replaced mine with stainless steel worm drive clips, and carefully positioned screw heads so as to be accessible to a 7mm socket with extension.

 

[Adie1023]

Either of the two pipes (reinforced rubber hoses) running across the upper front of the engine. There is a third short section of hose behind the intercooler roughly below the power steering reservoir, if that has not been moved by Hymer. In all six connections from reinforced rubber to metal, which are possible leak points. In addition hoses themselves can split. On my 2.8jtd the four clips closest to the intercooler were not the standard worm drive (Jubilee) type. These clips require a speciel tool. I have replaced mine with stainless steel worm drive clips, and carefully positioned screw heads so as to be accessible to a 7mm socket with extension.

Hi can't see anything noticeable the only one thats not flush is pipe going to intercooler plastic but dont think that will be it all others look secure

 

[Adie1023]

View attachment 473469

Any of the blue area , ( the area marked "compressor inlet" is ambient air pressure - the air you breathe freely)
anything in blue beyond the turbo (if the turbo is boosting/on boost **) is pressurised air, so the slightest airleak here will result in squeal/whistle


** i.e. when you're pushing the acc. pedal after 2100rpm ish

Should you be able to hear it when not driving or will it just be under load.

 

[ZaphodB]

Should you be able to hear it when not driving or will it just be under load.

The turbo will only be generating pressure under load and beyond 2100rpm (ish)

So it's pointless looking over it at idle with no load, because it won't be on boost/boosting - and that turbo pressure just isn't there.)

The leak doesn't have to be large to generate a whistle/squeal.... indeed if it was a larger air leak you'd notice a drop in performance under load.

Highest pressure is when under load and anything over 2100rpm, which is why you only hear it as you described in first post.

All relevant hose connections as described above have to be double checked (or even just replaced/re-made as in post 12 by Communicator) , then if it's a plastic manifold check for cracks/splits or tightness of any fixings, and then the intercooler...

Every connection or item in blue in the diagram I posted

 

[Adie1023]

The turbo will only be generating pressure under load and beyond 2100rpm (ish)

So it's pointless looking over it at idle with no load, because it won't be on boost/boosting - and that turbo pressure just isn't there.)

The leak doesn't have to be large to generate a whistle/squeal.... indeed if it was a larger air leak you'd notice a drop in performance under load.

Highest pressure is when under load and anything over 2100rpm, which is why you only hear it as you described in first post.

All relevant hose connections as described above have to be double checked (or even just replaced/re-made as in post 12 by Communicator) , then if it's a plastic manifold check for cracks/splits or tightness of any fixings, and then the intercooler...

Every connection or item in blue in the diagram I posted

Did you see the photo of the small gap i posted earlier thanks.

 

[jackwhoo]

Hi can't see anything noticeable the only one thats not flush is pipe going to intercooler plastic but dont think that will be it all others look secure

Hose does not have to be "flush " the clamp band makes the seal

 

[Communicator]

The turbo will only be generating pressure under load and beyond 2100rpm (ish)

So it's pointless looking over it at idle with no load, because it won't be on boost/boosting - and that turbo pressure just isn't there.)

The leak doesn't have to be large to generate a whistle/squeal.... indeed if it was a larger air leak you'd notice a drop in performance under load.

Highest pressure is when under load and anything over 2100rpm, which is why you only hear it as you described in first post.

All relevant hose connections as described above have to be double checked (or even just replaced/re-made as in post 12 by Communicator) , then if it's a plastic manifold acheck for cracks/splits or tightness of any fixings, and then the intercooler...

Every connection or item in blue in the diagram I posted

The 2.8idTD, and 2.8jtd have cast aluminium inlet manifolds., so crack is unlikely. Checking the intercooler could be more of a problem. Perhaps examine with the aid of a mirror, or a more sophisticated device. I would expect the compressed air from the turbo to contain a trace of lubricating oil. This could come from the turbo oil seals, and/or blowby gases from the sump. Any oily patch on pipe connections and intercooler could be a pointer to the leak.

Hi as a total novice which pipe would that be i think mine is jtd is it at top of engine or bottom thank you.

Not important in current context, but worth knowing what you have! When time permits, check the VIN plate next to the heading "MOTORE" 2.8idTD is 8140,43, while 2.8jtd will be 8140,43s. Note the "s". 2.8jtd is acommon rail engine with electronically controlled injection.

 

[Adie1023]

The 2.8idTD, and 2.8jtd have cast aluminium inlet manifolds., so crack is unlikely. Checking the intercooler could be more of a problem. Perhaps examine with the aid of a mirror, or a more sophisticated device. I would expect the compressed air from the turbo to contain a trace of lubriating oil. This could come from the turbo oil seals, and/or blowby gases from the sump. Any oily patch on pipe connections and intercooler could be a pointer to the leak.

Not important in current context, but worth knowing what you have! When time permits, check the VIN plate next to the heading "MOTORE" 2.8idTD is 8140,43, while 2.8jtd will be 8140,43s. Note the "s". 2.8jtd is acommon rail engine with electronically controlled injection.

Mine is definitely 8150,43s thanks at a loss will start it up and see when someone revs if I can hear anything if not it will have to go to garage grr

 

[Adie1023]

Hose does not have to be "flush " the clamp band makes the seal

Ah okay was hoping it was easy fix grr