Hello out there 

I v’e got a 2015 Yeti 4x4.  It has recently started making a noise from the rear while driving and gets louder the quicker you go 

It’s recently had rear wheel bearings both sides also  rear discs and pads fitted.

Oils in the Haldex & differential look good and are up to the fill mark.

I was wondering if the flexible coupling connecting prop shaft to diff is causing the trouble?

looks like an effort to change!

If anybody has any thoughts I’d be grateful to hear them.

Thanks 

Cliff 

If nobody has tried to do change the Haldex oil & possibly made the mistake that I and many others have then the most likely culprit will be premature failure of one of the new wheel bearings.

 

TBH I am surprised that the originals had failed.

I take it the wheel bearings, discs and pads have been fitted because of the noise and have proved to not be the cause?

When I bought the car the NSR bearing was shot and the car dealer replaced bearing before I took delivery 

A few months later I replaced OSR bearing thinking it was on its way out too.

Probably wasn’t just the start of this current noise.

Swap the wheels front to rear, see if that cures it.

Thanks for reply.

I'm just waiting for delivery of some haldex oil.

I'm going to change both diff and haldex oils, clean filter screen in pump and then as you suggest swap tyres. 

I'll post results.

The differential oil on a car that has not been run dry through mistaken draining will look as clear and smell like brand new oil after 80K miles, probably double that.

 

I know this through having mistakenly drained mine thinking it was the Hladex fluid & then compounding it by driving with it dry for a couple of hundred miles.

 

I filled the overheated diff with a 50/50 paraffin & oil mix & ran it on stands for 20 minutes then drained to flush out the metal particles, it came out black, I refilled it with the closest to correct grade of oil I could get during our first week of confinement & have done 8K miles since then and drained & refilled with the correct grade oil last week, what came out was discoloured & smelt of burning, no different really to draining a diff on a 70's or 80's car but very different to what came out when the Skoda diff had been unmolested.

 

Normally I would say don't bother to change your rear diff oil but in this instance its a good precaution (make sure you get the right drain plug!!!!) and if the oil that comes out is anything other than pristine then I would say you have a problem.

Thanks for your thoughts.

I have since your message; 

Changed the Haldex oil and cleaned the strainer. 

The oil was the colour of tea / coffee it also had some black particles in it.  The strainer also had quite a bit of gunk in and around it.  The Haldex was low on oil also.  I recovered about 600ml.

I have also changed the differential oil

Swaped tyres front to back and adjusted tyre pressures (2.2 Bar)

Road Test.

Still the same !!!

I disconnected Haldex electrically.  No Change.

Noise starts about 25 mph and no difference when driven or free wheeling

Noise is definately a rotary whirring noise.

Can anyone add anything?

Or it looks like a trip to the Skoda agent.

 

 

 

Could it be part number 6  here?

Hello

That has been my thought for some time now.

Unfortunately not something I can change out working on my back.  My Yeti has the one piece prop.

Looking at the manual it seems to be a bit of a job?

Regards.

No, not a whirring sound. If you want to be 100% sure then remove the propshaft and road test.

 

Condition of Haldex oil is par for the course, what was the diff oil like?

Edited 1 July, 20214 yr by J.R.

Hello

Camparing old diff oil with new oil.  I would say it looked pretty good. Certainly looked better than the Haldex oil.

Removing prop shaft on my back is not possible.

Regards.