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GLE350d - OM642 Diesel - Turbo Whistle Under Acceleration?

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GLE350d - OM642 Diesel - Turbo Whistle Under Acceleration?

 
Old 07-30-2016, 11:10 PM
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GLE350d - OM642 Diesel - Turbo Whistle Under Acceleration?

Wondering if some whistle noise is normal for the OM642 diesel under acceleration? Notice is especially when accelerating between 80 and 110km/h.
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Old 08-01-2016, 04:26 PM
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I have zero whistle in my 350d.
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Old 08-02-2016, 09:55 AM
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No whistle at any speed. Like in all diesels I can hear a faint spooling sound when accelerating.
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Old 08-03-2016, 04:05 PM
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I haven't noticed any whistling either, sorry.
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Old 08-05-2016, 11:59 AM
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The dealer is replacing the entire turbo. They've already replaced a few turbo seals once, but that didn't eliminate the problem.

Hopefully this cures it. Car has 2,500KM on it.
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Old 08-07-2016, 12:27 PM
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Wow! Sorry to hear that.
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Old 08-11-2016, 11:48 AM
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Got it back... noise still there, although a bit muted. All seals have been replaced, new turbo, etc.

It can be replicated if you put the transmission in manual and pull hard from 60 to 100km/h (don't push the accelerator all the way to kickdown, just before, so it pulls only in gears 5 6 or 7).

I drove the managers GLE and it has the same whistle, although a bit quieter.

Everyone sure they also don't also have this issue? Starting to think it's just the way these engines are, unfortunately.
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