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Hollow whine at 45mph

Discussion in 'Engine, Drivetrain, Fuel and Exhaust' started by ABLDR, Nov 11, 2016.

  1. ABLDR

    ABLDR Member

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    Your Mercedes:
    Sprinter 906 2008 311
    Hi guys.

    This one is really bugging me.

    Got a 2006 56 plate 315cdi Sprinter. 240000 Miles

    Parts replaced on this car, well it's basically a new van if i am honest!!

    It's had:-

    2 NEW, not second hand, not refurbs, NEW engines, both from the main dealer
    New gearbox (Main dealer)
    New Alternator (Main dealer)
    4 new injectors (Main dealer)
    DPF (Main dealer)
    Cat (Main dealer)
    Propshaft (rebuilt..All new UJ's and both bearings)
    EGR (Aftermarket)
    Viscous
    Air con pump
    Rear half shafts
    etc etc etc

    So as you can see, we do not skrimp and scrap on it.

    However, over the past 2-3 weeks it has developed this funny whine and only at certain speeds and regardless of accelerating or de accelerating. In fact when the noise comes we can turn the engine off and coast and the noise is still there.

    When the vehicle is cold the noise starts at 20mph and stops at 35ish mph
    As the car warms up the noise then starts at 45 mph and stops at 55mph. If you go above these speeds the noise stops. I thought maybe it was the wind whistling through a vent or something first, but if i put my head to the back board whilst the noise is there it sounds as though it is coming from the rear. Could be wrong.

    Wheels up spinning each one, nothing seems to be the problem. Had a stethoscope on the hubs, no grinding noises

    All that is left is to disconnect the abs, jack up the rear and stick it in gear and drive it, but the fact that when the noise comes i can dip the clutch, turn the van off and the noise will still be there until it drops under the speed it usually comes at leads me to believe its not diff.

    Any takers?? LOL

    Cheers all

    Jason
     
  2. Taffy7hfa

    Taffy7hfa Senior Member

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    Your Mercedes:
    2004 ML350 Inspiration.2002 ML270 CDI Fully loaded.2019 Insignia SRI.2014 Peugeot 308 1.6 HDI.
    Wowza ! how did you manage to get through 2 engines and a gearbox in 24 K !! you are harder on machinery than my other half ;).
    No idea whats causing your noise btw, although if anyone says "whine" I always think diff.
     
  3. OP
    ABLDR

    ABLDR Member

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    Your Mercedes:
    Sprinter 906 2008 311
    240K, not 24K :D

    First engine went in Austria at 179,000
    Second engine went in Hungary at 225,000

    Second engine was out of warranty by just 1000K and Mercedes couldn't have given two craps about it!!! :) They did a Lewis Hamilton on me i think!! Gave me duff engines :D :D :D
     
    Last edited: Nov 11, 2016
  4. Taffy7hfa

    Taffy7hfa Senior Member

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    Your Mercedes:
    2004 ML350 Inspiration.2002 ML270 CDI Fully loaded.2019 Insignia SRI.2014 Peugeot 308 1.6 HDI.
    Aaaahh fair enough ! my mistake. Diesels are not indestructible, I lost a con rod on a 1 year old Nissan Navara with 40k on the clock, they were a bit perplexed but did replace it under warranty.
     
  5. OP
    ABLDR

    ABLDR Member

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    Your Mercedes:
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    Mercedes point blank refused to do anything. I was in a massive tackle with them for around 2 weeks waiting for them to do something. In the end we just bought a new engine from them and my colleague fitted it. From that day onwards we refuse to buy another Sprinter. We now use Crafters and although I hear some horror stories, our ones are running very well and only the usual problems. Egr, DPF that sort of thing.

    Oh also forgot to mention, we also had a new turbo fitted 2 years ago and 2 days out of warranty it blew up!!! Again they refused to do anything about it. Worst customer aftersales i have ever known in my life, honestly :)
     
  6. television

    television Always remembered RIP

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    Your Mercedes:
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    The only thing that I know that can make a whine is the diff, but these mainly whine when pulling lightly, and not on the over run.
     
  7. OP
    ABLDR

    ABLDR Member

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    Yes that was my thinking too. This happens even when you get to the speed it happens, then dip the clutch and turn the engine off. It continues the same sound until the speed drops below what it usually comes at. Very strange noise.
     
  8. television

    television Always remembered RIP

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    What causes the whine in a diff is when the pinion goes out of mesh with the crown wheel, I wonder if a bearing is damaged rather than worn and its out of mesh all the time
     
  9. OP
    ABLDR

    ABLDR Member

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    Would that not be at all speeds though??
     
  10. television

    television Always remembered RIP

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    These faults do not start to make any noise until about 40mph,,, I see that you have had new drive shafts, I wonder if a bearing in the axle.
     
  11. OP
    ABLDR

    ABLDR Member

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    The half shafts were done around 2 years ago by Mercedes in Austria.

    Recently the prop was done, around 1 month or so ago. I was wondering if it could have been a duff centre bearing or something like that. I do have a little vibration at 50mph, very slight. I'll jack this up tomorrow and get under with a stethoscope and see if i can hear any noise on it then. Problem being by jacking it up you take all the load off the axle, mind you, the load is also taken off when you dip the clutch and the noise is still there then
     
  12. television

    television Always remembered RIP

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    By leaving the car in P and jacking one wheel at the rear and rocking the wheel you will see if the prop shaft moves and for free play in the center bearing.
     
  13. LostKiwi

    LostKiwi Senior Member

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    Also check for lateral and axial motion in the pinion bearings.
     
  14. oigle

    oigle Senior Member

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    Think about tyres too. They will make noise regardless of in gear or on power etc.

    Ian.
     
  15. Wighty

    Wighty Senior Member

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    With all that work is it possible that a directional tyre has been fitted the wrong way round (rolling in the wrong direction ) ?
     
  16. kid-jensen

    kid-jensen Senior Member

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    My money's on the diff..

    Maybe damaged when the halfshafts were fitted?

    Always eliminate the tyres by swapping front-to-back before you open your wallet..
     
    Last edited: Nov 14, 2016

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