E46 320 Whining noise before turbo
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  1. #1
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    Whining noise before turbo

    Hi guys, I've got an e46 320cd (2004) and last night its started to make this strange whining noise.

    The best way I can describe the noise is it sounds similar to electric power steering like on the mini cooper, but slightly deeper. The noise seems to come and go, but is louder when my foot is down more, but it only makes this noise until around 1700-2000rpm when the turbo comes in and then you can't hear it.

    Any ideas on what this could be?

    thanks for any help

  2. #2
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    Pretty hard to diagnose intermittent noises so if you can post up a video sound clip of this noise it may help?
    It won't do you any harm if you visually check all vacuum and charged air pipes/connections for splits and perishing and while the engine plastic covers are off make sure everything is tight and secure.
    Does it only happen when under load or if revved when stationary
    and whereabouts in the engine bay does the sound appear to be coming from? Also have the swirl flaps been removed or inspected?


    Sent from my GT-I9100

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    eagle90 (15-08-2012)

  4. #3
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    well, unfortunately before ive had chance to have a look at it the problem has got worse.

    Today the sound got worse and was more a scraping sound and the car lost power and wouldn't rev above 2k rpm, so i thought the car had maybe gone into some limp mode, I wasn't far from home so decided to drive carefully. But then it started to chuck out white/light grey smoke filling the whole road, so i pulled up and turned off. There seems to be some evidence of it burning oil as it looks wet on the exhaust pipes.

    Im assuming my turbo has said its goodbyes? But if someone could confirm that would be good thanks

    If it is, can anybody recommend a good refurbishment company in the UK that will either sell me an already furbed one or refurb mine?

    thanks

  5. #4
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    From reading the title I was going to say is it your misses whining you are going too fast

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    Jones (27-09-2012)

  7. #5
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    Sad to say it does sound like the turbo has gone or us going
    As a quick check you can remove the air tube that runs from the MAF to the turbo intake.
    Once off you will be able to waggle the turbos shaft, movement of 0.5mm side to side is acceptable but push & pull play should be nil.
    I suspect the front bearing is shot and the fins are rubbing on the bore of the intake!
    I can add pics if you think it'd help?

    Sent from my GT-I9100

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    eagle90 (15-08-2012)

  9. #6
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    Quote Originally Posted by Plumb View Post
    From reading the title I was going to say is it your misses whining you are going too fast
    Ha! I wish it was, would be a cheaper and easier cure :P


    Quote Originally Posted by simonsays View Post
    Sad to say it does sound like the turbo has gone or us going
    As a quick check you can remove the air tube that runs from the MAF to the turbo intake.
    Once off you will be able to waggle the turbos shaft, movement of 0.5mm side to side is acceptable but push & pull play should be nil.
    I suspect the front bearing is shot and the fins are rubbing on the bore of the intake!
    I can add pics if you think it'd help?

    Sent from my GT-I9100
    Ok, yes if you could please, would like to have a look so I can get one ordered and stop my car being a portable smoke machine!

    Can you recommend any good places that sell refurbished turbos?

    thanks

  10. #7
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    On a cold engine you can manually inspect the turbo shaft for excessive play by removing the air tube(#3 in image) that runs from the MAF sensor
    to the turbo intake then waggle the shaft side to side and front to back.
    A little play is acceptable but anything excessive is liable to be bearing wear and eventually failure.
    Be careful when refitting the air pipe rubber gasket (#6 in image) as it may get trapped as you refit the pipe.

    image taken from RealOEM page RealOEM.com * BMW E46 320d Mass air flow sensor/intake silencer



    To access the air pipe remove the plastic engine covers and unscrew the two allen screws from the Air Tube (no.2 in pic),
    remove any clipped on vacuum pipes from the Air Tube and pull the Air Tube towards the front of the engine (no.3 in pic)and it will come away from the MAF housing,
    then manipulate the lower part to separate from the Turbo, then pull the Air Tube clear. You should now be able to see the Turbo shaft and blades.

    Ignore notes 1) & 4) in the picture and use only notes 2) & 3).


    After you've removed the pipe you'll be able to see the turbo intake and its shaft as below & midland Turbo seem to offer good rates and have a decent reputation.
    You could always ask the advise of a local trusted garage and see who they'd preferably use?


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    eagle90 (19-08-2012)

  12. #8
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    thanks Simon, got it all off and its definitely the turbo! got plenty of play in it.

    So im now in the process of taking the turbo, but cant seem to get the banjo bolt off, i cant seem to get any tool in there to release it, do you have any tips?

    thanks

  13. #9
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    That's terrible news bout the turbo & sorry mate I've never actually had cause to remove one
    Is the bolt head rounded off or can't you gain access to it?

    Realoem diagrams may help or TIS? I'll edit the links in once I get home.

    RealOEM.com * BMW E46 320Cd TURBO CHARGER WITH LUBRICATION

    BMW TIS - 11 65 020 Removing and installing or replacing exhaust turbocharger (M47TU)

    hth

    Sent from my GT-I9100
    Last edited by simonsays; 18-08-2012 at 10:14. Reason: links added

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  15. #10
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    Sorry or hear this, mine went like that 2yrs ago, pain in the behind to change, I got mine grime euro car parts, around £600 refurb and had to give my old one in, I can just remember buying lots of little extension to get in all the gaps, I took it out from underneath, I think a few bolts went from 3/4 to 1/2 to 1/4 with extension bars and knuckle joints, i also replaced the vortex filter again and cleaned out the intercooler, not a great job, good luck with it,

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