Please watch this youtube video. About 5 seconds into video is when it starts. I was revving the engine to get the turbo to spin, once it does it makes that sound. Any ideas?

Mercedes Turbo Whine - YouTube

It does it with the air cleaner on also. It just started this yesterday. About a week ago the turbo whistle became louder (sounded more like exhaust leak) which I thought was due to an exhaust leak. The exhaust is not in good shape so that is why I assumed it was an exhaust leaking cause the turbo to get louder. But this new sound is something I've never heard from a Mercedes diesel (only been around 5 of these old diesels.)

Any help would be great!

Inspect the waste gate hose.

Doesn't sound exhaust related.

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83 SD

84 CD

I agree this does not. Before this sound the turbo sounded normal but louder so I figured exhaust.

Thanks, I'll check it next break.

Waste gate hose is fine, still making the noise. Any other ideas?

Have you checked for lateral play in the shaft?

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85SD 240K & stopped counting painted, putting bac together. 84SD 180,000. sold to a neighbor and member here but I forget his handle. The 84 is much improved from when I had it. 85TD beginning to repair to DD status. Lots of stuff to do.

No. Do I just reach in the intake side and try to move it?

Well I just went out and tried to move it. It moves a little bit, how much is ok? Any at all?

which way did you move it? in out or up down?
should be near zero in out, and little up down IIRC...

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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 190D 2.5Turbo
1987 190D 2.5-5SPEED!!!

1987 300TD
1987 300TD
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!

It doesn't move in and out, just up and down a little.

Its pulling in air around the inlet gasket from the air cleaner would be my guess like others here have said ,tighten the clamp up or get a new or better one.

You can make a boost boot to test for air leaks. Just push the google button a little & lots of info will appear.

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85SD 240K & stopped counting painted, putting bac together. 84SD 180,000. sold to a neighbor and member here but I forget his handle. The 84 is much improved from when I had it. 85TD beginning to repair to DD status. Lots of stuff to do.

It's not the inlet gasket. This is much different.

Edit: ....make a boot, pressurize the system and find out where it is leaking.

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85SD 240K & stopped counting painted, putting bac together. 84SD 180,000. sold to a neighbor and member here but I forget his handle. The 84 is much improved from when I had it. 85TD beginning to repair to DD status. Lots of stuff to do.

What year is the car? If its a newer 300D, it could be the ARV. Try pulling out the vacuum hose to the ARV and see if the the whistle goes away.

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'85 300D Cal 280,000 miles
'14 GLK 350 60000 miles

It's an 83. I did see on a thread something about the ARV but have no clue what that is. lol