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  #1  
Old 11-14-2012, 09:57 AM
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Turbo Whine - W123

Is it normal to hear a little turbo noise under moderate acceleration? I hear a slight whining noise when pulling away. I tried to wiggle the turbo vanes but there's really not a lot of play. The heavy plastic connector from the turbo to the air cleaner is tight and has no cracks. No heavy smoking either. Not a terrible sound mind you, I just don't recall if I had been hearing it before. I was thinking the tranny too, but the pitch of the whine doesn't change much after the trans has shifted up a gear.
Thanks
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1985 300D 197K - Semi-Daily Driver Diesel
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  #2  
Old 11-14-2012, 11:53 AM
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What you describe isn't ABnormal, put it that way. The car didn't make that sound when it rolled off the dealer lot, but it comes to a greater or lesser extent with age, based on my experience.

My current car is an '85 like yours with 102k and I cannot hear the turbo. My '79 SD was like yours is now, all 8 years I owned it. On acceleration my '83 SD sounded like the highway patrol was about 10 seconds behind....

The only thing I would mention to check would be the turbo inlet hose, but as you looked at the vanes you've already had that off and on so it must be tight.
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Last edited by Zacharias; 11-14-2012 at 12:04 PM.
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  #3  
Old 11-14-2012, 03:39 PM
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Leaks in the Intake Manifold or other Turb Connections on the pressure side of the Intake can cause the Turbo to over speed.

I thin it is also possible for the Exhaust to make nose if there is a tiny split in the expansion Joint at the Turbo.

When the Engine is cold spray the intake down with a mix of Water and Dawn Dish Soap to make a mix that can bubble.
Unfortunately the Formula My Wife uses for Her Day Care Class is 1 gallon of Water to one cup of Dawn. I will let you reduced it to a more manageable amount.

If you a leak when you reve the Engine to produce boost it should bubble.
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  #4  
Old 11-14-2012, 04:10 PM
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Mine sounds like a 747 at full take-off....:-)
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Did you just pass my 740 at 200 kmh in a 300SD?????

1978 300SD 'Phil' - 1,315,853 Miles And Counting - 1, 317,885 as of 12/27/2012 - 1,333,000 as of 05/10/2013, 1,337,850 as of July 15, 2013, 1,339,000 as of August 13, 2013



100,000 miles since June 2005 Overhaul - Sold January 25th, 2014 After 1,344,246 Miles & 20 Years of Ownership
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  #5  
Old 11-14-2012, 08:03 PM
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It's a common for the '85 to have a whine because of an incorrectly functioning Air Recirculating Valve (ARV). The easy fix is to disconnect the vacuum line to the turbo and plug up the ends. This disable the ARV and should stop the whine.


.
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  #6  
Old 11-14-2012, 08:42 PM
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Thumbs up

i <3 turbo whine!

since i put in my hot air intake, i get to hear that sweet music at every take off.
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  #7  
Old 11-14-2012, 09:16 PM
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Quote:
Originally Posted by pgringo View Post
i <3 turbo whine!

since i put in my hot air intake, i get to hear that sweet music at every take off.
If you remove the Hood Pad it will be louder.
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  #8  
Old 11-14-2012, 09:29 PM
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Quote:
Originally Posted by Diesel911 View Post
If you remove the Hood Pad it will be louder.
long gone way before i ever got ahold of this car. like i've said before, i've seen nicer cars than mine in the junkyard.
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  #9  
Old 11-14-2012, 10:18 PM
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Double check your over boost protection, make sure your air cleaner is secure and all it's hoses and oil drainage is secure.

As the others have said, you may just have a loud turbo. Mine whines every so often when I romp on the accelerator at 2500 RPM.
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  #10  
Old 11-14-2012, 11:34 PM
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Quote:
Originally Posted by Diesel911 View Post
If you remove the Hood Pad it will be louder.
Does the hood pad make that much difference???? My folks bought me one for my recent birthday, but I am yet to install it....
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Did you just pass my 740 at 200 kmh in a 300SD?????

1978 300SD 'Phil' - 1,315,853 Miles And Counting - 1, 317,885 as of 12/27/2012 - 1,333,000 as of 05/10/2013, 1,337,850 as of July 15, 2013, 1,339,000 as of August 13, 2013



100,000 miles since June 2005 Overhaul - Sold January 25th, 2014 After 1,344,246 Miles & 20 Years of Ownership
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  #11  
Old 11-15-2012, 09:00 AM
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When I bought mine 7 years ago, I could only hear the turbo when cruising steadily at exactly 65 mph. Now I can hear it from 60 to about 70. I haven't checked for boost leaks, but if I have any, they must be small, since performance hasn't suffered.
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  #12  
Old 11-15-2012, 10:18 AM
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leaks will not affect performance, they will affect longevity. any leaks allow Dirt past the air filter...
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  #13  
Old 11-15-2012, 11:14 AM
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Quote:
Originally Posted by DeliveryValve View Post
It's a common for the '85 to have a whine because of an incorrectly functioning Air Recirculating Valve (ARV). The easy fix is to disconnect the vacuum line to the turbo and plug up the ends. This disable the ARV and should stop the whine.


.
Usually this manifests itself as more of a whistle but its worth checking!
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  #14  
Old 11-15-2012, 11:53 AM
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Quote:
Originally Posted by Doktor Bert View Post
Does the hood pad make that much difference???? My folks bought me one for my recent birthday, but I am yet to install it....
I have read that it doesn`t make any decrease in the noise level, however when I installed a new one on the 240, it really did make a noticable difference.

I have the Turbo pad on it and don`t hear the Turbo Whine now.

Charlie
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there were three HP ratings on the OM616...

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Anyone that thinks a 240D is slow drives too fast.

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  #15  
Old 11-16-2012, 12:58 AM
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I am going to get my new pad on next week and I will report back then!!!!
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Did you just pass my 740 at 200 kmh in a 300SD?????

1978 300SD 'Phil' - 1,315,853 Miles And Counting - 1, 317,885 as of 12/27/2012 - 1,333,000 as of 05/10/2013, 1,337,850 as of July 15, 2013, 1,339,000 as of August 13, 2013



100,000 miles since June 2005 Overhaul - Sold January 25th, 2014 After 1,344,246 Miles & 20 Years of Ownership
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