thomasz
Member Since: 01 Oct 2021
Location: Kulmbach
Posts: 109
  
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| humming or whirring noise when accelerating |
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Hi!
D4, 2.7L, manual gearbox, MY 2010
Have a humming or whirring noise when accelerating.
I can easily feel that on the steering wheel.
Ideas where to start looking?
Thomas
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 6th Nov 2021 4:04 pm |
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M3DPO
Member Since: 22 Sep 2010
Location: Notts.
Posts: 8244
 
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Could be any number of things, most common wheel bearing(s), cv joint, front diff. It can when others can't,
It will when others won't,
It goes where others don't.
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| 6th Nov 2021 6:34 pm |
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thomasz
Member Since: 01 Oct 2021
Location: Kulmbach
Posts: 109
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Can I check the parts when they are installed, or do I have to start replacing them until the noise is gone?
Start with the cheapest -> bearings then shafts and hope not the differential?
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| 7th Nov 2021 7:09 am |
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M3DPO
Member Since: 22 Sep 2010
Location: Notts.
Posts: 8244
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I would drain the oil out of the front diff and check it for metal fragments first, if there are any present that could be your problem, refill with new correct grade oil.
Jack front wheels up and turn them by hand feel for any uneven resistance or vertical play in them, a worn wheel bearing can be very difficult tell which one is faulty, they are usually worse when cornering not accelerating. It can when others can't,
It will when others won't,
It goes where others don't.
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| 7th Nov 2021 9:24 am |
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thomasz
Member Since: 01 Oct 2021
Location: Kulmbach
Posts: 109
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I have changed all oils except engine oil some days ago.
I did not find anything worrying in the oils, not even in the oil from front diff.
It is difficult to turn the front wheels because you move the entire drive with them.
Maybe wait until it gets worse or start with the bearings. 
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| 7th Nov 2021 5:38 pm |
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thomasz
Member Since: 01 Oct 2021
Location: Kulmbach
Posts: 109
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Last week, there was additional a louder humming.
Chassis Ear say: Diff front.
Okay - we renew the front diff, the front drive shafts left an right an both wheel bearing on front axle.
Louder humming is gone - perfect.
But the vibration on accelerate is still there. 
You can feel it on the floor, pedals an steering wheel.
Vibes are only on acceleration..... not to much, but anoying.....
Any ideas?
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| 30th Nov 2021 8:54 am |
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eightfoot
Member Since: 12 Apr 2015
Location: sunny essex
Posts: 810
  
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whats the condition of your front arm rear bushes as i had a very similar thing also with occasional brake /steering wheel wobbles turned out to be the lower arm rear bushes shot please excuse any grammer/punctuation mistakes,i'm thick,thankyou
current vehicles 2005 d3 2013 d4
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| 30th Nov 2021 9:38 am |
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grzesiul
Member Since: 11 May 2008
Location: UK
Posts: 6415
 
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thomasz -- vibration on acceleration is also very prominent sign of badly worn front tires or uneven wear of them
had that with present bus new tires fixed it
good luck solving issues
G
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| 30th Nov 2021 9:40 am |
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thomasz
Member Since: 01 Oct 2021
Location: Kulmbach
Posts: 109
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Alle the arms/bushes on front axles are new.
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| 30th Nov 2021 9:40 am |
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thomasz
Member Since: 01 Oct 2021
Location: Kulmbach
Posts: 109
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There are new winter-tires on the car..... Nokian WR SUV 4
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| 30th Nov 2021 9:45 am |
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M3DPO
Member Since: 22 Sep 2010
Location: Notts.
Posts: 8244
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Front prop shaft centre bearing? It can when others can't,
It will when others won't,
It goes where others don't.
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| 30th Nov 2021 9:48 am |
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thomasz
Member Since: 01 Oct 2021
Location: Kulmbach
Posts: 109
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Center bearing FRONT propshaft?
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| 30th Nov 2021 9:49 am |
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M3DPO
Member Since: 22 Sep 2010
Location: Notts.
Posts: 8244
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Front prop shaft and rear Center prop shaft Center bearing. It can when others can't,
It will when others won't,
It goes where others don't.
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| 30th Nov 2021 9:59 am |
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thomasz
Member Since: 01 Oct 2021
Location: Kulmbach
Posts: 109
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ahh okay 
will check it
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| 30th Nov 2021 10:12 am |
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barbelist
Member Since: 21 Dec 2015
Location: Leeds
Posts: 13
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thomasz wrote:There are new winter-tires on the car..... Nokian WR SUV 4
That’ll be it surely?
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| 6th Dec 2021 6:20 pm |
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