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Discussion Starter #1
Hi there,

I`m writing this post because i have a weird noise (groaning / humming) after 30 mph and it gets louder with the incresing of speed, sometimes the noise is there other times isn't. I have checked the car out on a lift but no noise. Made a recording in the car at 65-70mph so please listen to it and if someone has heard the noise or something similar please reply.


Thank you.
 

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Not to get your hopes up, but I had a noise exactly like that and took months to figure out. But my noise was due to the Vertex solution having a thin amount of grease between the main bearing and aluminum casting. The bearing would then rotate inside the casting and make this exact noise (cleaned with brake cleaner and is now gone). If you don't have the Vertex, perhaps center main bearing itself...not the support I am talking about the bearings themselves. Also, it might not make noise on lift, because driveline tension would be gone, but a stethoscope to the main bearing area should still render the noise at a decreased volume...this is similar to how I found mine, but I put my phone on record and then placing under passenger's seat and there the noise was most pronounced... hope this helps...mine did sound like wind or like something stuck in the dash vents, I suspected this for the longest time...
 

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Discussion Starter #5
Not to get your hopes up, but I had a noise exactly like that and took months to figure out. But my noise was due to the Vertex solution having a thin amount of grease between the main bearing and aluminum casting. The bearing would then rotate inside the casting and make this exact noise (cleaned with brake cleaner and is now gone). If you don't have the Vertex, perhaps center main bearing itself...not the support I am talking about the bearings themselves. Also, it might not make noise on lift, because driveline tension would be gone, but a stethoscope to the main bearing area should still render the noise at a decreased volume...this is similar to how I found mine, but I put my phone on record and then placing under passenger's seat and there the noise was most pronounced... hope this helps...mine did sound like wind or like something stuck in the dash vents, I suspected this for the longest time...
Thank you for your detailed reply.
I don't have the Vertex solution still have the same OME type bearing support, don't know if it was ever changed because I bought the car with 101k couple of months ago.
Did listen whit the stethoscope the bearing but didn't hear any out of the ordynary noise when car on lift, will try to listen again with the car rewd at 40-50mph, hopefully i will hear something.
 

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Wonder if a wheel bearing could be the culprit?
That's were I am thinking it may be from. Somewhere in the drive line as you state that it is speed related. At the very least I would get the oil in your differentials and transfer case checked for metal. The noise sounds like a vacuum leak, that you may find in the engine bay, however this would be very obvious at idle.
 

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Couple odd questions: can you pinpoint where the noise is coming from driving left / right / front / rear or no direction? If you can't tell direction than it is most likely center...
Does turning left or right increase or decrease it? Does braking do anything to intensity or pitch?
Wheel bearings in my experience will change with turning left or right by either diminishing or getting louder...they also seem to need the weight of the vehicle to make noise so it would make sense that it wouldn't make it on the lift...
 

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Discussion Starter #9
So problem solved, it was the driveshaft central bearing!
I replaced it yestarday and no more noise, now I'm hoping that i managed to align the driveshaft the right way so i won't have any other wierd or strange noises.
 

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Well done. Classic, and very well known, issue!
 

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Excellent! I think you would know right away if the alignment was off because it would shake / have a vibration. Sounds like things are all good.
 

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Well done. Classic, and very well known, issue!
Interesting though. Normally centre bearing failures involve vibration without bearing noise, where in this instance, the OP had noise without vibration.

Just when you think you know all there is to be known about an issue with these vehicles something new pops up.

Stuart...
 

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Since we are on the topic of rumbling noises. I have a low frequency rumbling noise coming from my driveline in my 2009 Touareg. It increases as speed increases. I went under to check the center bearing and a new driveline assembly had been installed (I recently purchased this car). Could it have been installed incorrectly?

An additional note: The dealership where I bought the car mentioned that they had installed two new tires on the back of the car. I heard that Touaregs do not like unmatched tires (new & used) could this be a cause of the rumble?

Any ideas?

Thanks
 

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You MUST run 4 identical tires - same make, same model, same tread, same size, same wear.
 

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Regrettably you won't know for sure unless you replace those other two tires! But it's the cheaper option over a new shaft.
 

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driveline

Replaced the tires. So now I have all 4 of the same brand new Hankook on.
Still getting the rumbling noise at 55 mph on.
Checked the center support bearing and I can move it up and down with my hand about 13-20mm.
But the rubber support is not split or cracked anywhere that I can see.
This drive shaft has been replaced. It is a Spidan, Uni-Cardan LoBro unit from GNK. Which is supplied to all of the repair shops from what I can gather, so I am assuming it is a quality replacement unit.
My first question is, how much play is allowable in the center support bearing?

Second, is it possible that in 95k miles you could go through two rear drive shafts?

TIA
 

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Perhaps time for a lift such that you can listen underneath while noise is replicated. I have read of differential noise that some have had, does this sound likely? I do not think the OEM shaft bushing would be capable of making a rumbling noise...perhaps because it isn't OEM? Shaft wear sounded like a squeaky bird for me because the bushing had disconnected from the bearing allowing the bearing to somewhat freely rotate. Later this was replaced by a shuddering shimmy, then an all out flat tire feeling. I can not tell you the exact measurements on the amount of play (perhaps someone else can), but both my trucks are pretty snug when trying to wiggle the prop shaft by hand.
 

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Discussion Starter #19
Replaced the tires. So now I have all 4 of the same brand new Hankook on.
Still getting the rumbling noise at 55 mph on.
Checked the center support bearing and I can move it up and down with my hand about 13-20mm.
But the rubber support is not split or cracked anywhere that I can see.
This drive shaft has been replaced. It is a Spidan, Uni-Cardan LoBro unit from GNK. Which is supplied to all of the repair shops from what I can gather, so I am assuming it is a quality replacement unit.
My first question is, how much play is allowable in the center support bearing?

Second, is it possible that in 95k miles you could go through two rear drive shafts?

TIA
I had the same up/down moment on the driveshaft before changing the center support bearing.
The bushing sourounding the bearing at first look seamed ok but compering to the new one it was very very soft.
In my case the bearing was gone and had that horrible noise.
 

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I have a very similar noise to the whine in the video. It's intermittent and only seems to occur after a few hundred km's and above 50kmph. I had the drive shaft checked (by specialists) and was told it ok. It sounds just like a belt squeal but is coming from the centre (below the gear shift) and only when moving.

Think of repacking the bearing with grease and cleaning the rubber support as a starting point - any ideas welcome though?
 
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