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Discussion Starter · #1 ·
It has not been a great day. I finished the refit of the front diff just before 11pm last night and this morning's test drive yielded the same drone :mad:

This afternoon I pulled out the front left CV axle and hub carrier. Next target is both front wheel bearings and I may get the innards of the cv axles inspected too whilst they are off the car. I had initially ruled out wheel bearings since there was no discernible play when grabbing the tyres and giving them a good shake, but what do I know...

I suppose the re-built diff wasn't a total waste of time and money since the gear oil was full of glitter and the bearings were pitted upon inspection. I also console myself by saying that there is no harm in replacing wear components on a 19 year old, 100k mile car...

I will report back in a week or two when the new bits are fitted.

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Bearings are weird ones though... I've had wheel bearing drone even when there's only a little play in the wheel. Was there anything at all?
 

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Discussion Starter · #3 ·
There was a TINY bit of play in the front right wheel when I was shaking the tyre. However, my head was turned by the metal particles in the front diff oil so I went down the wrong path initially.

Anyway I now have both front hub carriers off and the right-side wheel bearing is definitely the culprit, being quite loose with a hint of grumble. Sod's Law that all the workshops are shut for the long weekend so I need to wait to get the bearings pressed out and new ones supplied and fitted.

Mods - thanks for starting this new thread. Please remove "2.5 TDI" from the Title.
Edit - Done 鉁 - Cass
 

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Discussion Starter · #4 ·
Just back from a test drive and new front wheel bearings have resolved the drone. Phew. I took both front hub carriers to my local VAG specialist and they pressed out the old bearings and pressed in the new ones. They said their bearing press registered 15 tonnes before one of the old bearings decided to come out!

The new bearings are made by NTN-SNR.

I also had one cv axle boot replaced since it had a tiny split.

Good to get that saga out of the way. The original front differential bearings and wheel bearings lasted for 100,000 miles so I cannot complain.

Mods - feel free to remove "TDI" from the thread title, my car is first generation and uses petrol.
 

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I think you can change your thread title yourself.
 
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When diagnosing suspect wheel bearing noises, focus on the grumble rather than free play, as most wheel bearing set-ups have a certain amount of free play built in, but grumbles are significant ;)
 

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I too have a broken bearing on front left. Could not feel any play shaking the wheel. At 60km/h the grinding noise could be heard way louder when steering right and almost disappeared when steering left. Removed the brake caliper and disc. With the hub alone suddenly a distinct vertical play can be felt. Vertical, as in up/down. No play horizontal / left/right.
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Just back from a test drive and new front wheel bearings have resolved the drone. Phew. I took both front hub carriers to my local VAG specialist and they pressed out the old bearings and pressed in the new ones. They said their bearing press registered 15 tonnes before one of the old bearings decided to come out!

The new bearings are made by NTN-SNR.

I also had one cv axle boot replaced since it had a tiny split.

Good to get that saga out of the way. The original front differential bearings and wheel bearings lasted for 100,000 miles so I cannot complain.

Mods - feel free to remove "TDI" from the thread title, my car is first generation and uses petrol.
15 tonnes - not something you could chap out with a hammer and chisel then... :p Glad you're sorted though. (y)
 

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Great photo of the hub which shows just how much larger the 3 wheel locating "tabs" are on Generation 1 Touaregs than on the Generation 2 cars which contributed to the SWS issues which, curiously, seemed more prevalent in the US for some reason!
 
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