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super-ron

C5 S6 Diff (bearing?) problem.

I havea2001 Audi S64.2 5speed tiptronic.

I noticed the inside of my o/s/f wheel was gettinggrubby so i decided to take a look and as suspected, the innerCV boothad split. Whilst checking the innerCV jointfor free play i found there was quite alot of movement in thedriveshaft. At first i thought it was just theCV joint, but then found that the whole gearbox flange was moving!! theCVjointseems tight to the shaft, and tight to the gearbox flange, but all the movement is coming from what i believe to be the diff bearing. The other side is nice and tight and firm with no free play as you'd expect.

The strange thing is whilst driving there is no symptoms of this at all, no whining, no noises, no clonks, the drive train is seamless, its not even leaking oil from the diff seal. I have only discovered this whilst looking at theCV boot.

here are a couple of videos toshow the movement





Any suggestions or theories are more than welcome.
jockthedog

Yikes, I was expecting a little movement in and out, but not side-to-side.
That looks horrible. I don't think it's meant to do that!
Driveshaft bearing would be my first thought.
super-ron

Yikes is a little more tamer than I exhaled I can assure you!

Like I said it's given no symptoms, no noises, no clonks,  no leaks, I've only discovered it through checking this cv joint.

I was wondering if anyone had any previous experience with these boxes knew the possible cause.

First port of call is going to be checking the little bolt in the middle of the flange is tight, after that I guess it's time to dive inside the box it looks like from ElsaWin you can remove the diff from the box with the transmission all in place (ish).

Any gearbox experts that could give me a head start will be a great help.
jockthedog

Yiup.

Drain the oil from the diff cover plug (I've a feeling that this won't let much out if the car is level, as the same hole is used for filling.
remove that driveshaft flange stretch bolt you mentioned and the flange itself, remove diff cover, swear a lot when the diff falls out onto your foot.
You should be able to see what's what when you have those bits in your hand.

I've not been inside a tiptronic, but the front diff arrangement will be the same in most boxes.


Let us know what you find!
jockthedog

doh, This is the same type of box that I just took to bits - see my thread in this forum
I'm reading tiptronic and seeing something else.
super-ron

jockthedog wrote:
doh, This is the same type of box that I just took to bits - see my thread in this forum
I'm reading tiptronic and seeing something else.


Yes I did spot your thread, great pics! On ElsaWin too they look the same



There doesn't look anything else in there that side other than the taper roller bearing. Or anything that's chewed up from the movement
super-ron

i stripped it down today (photobucket is currently down but i do have pictures) and found this needle bearing in the centre of the diff where the shaft goes in to be in pretty poor and the flange shaft is pitted too. i phoned up audi and sure enough you can't buy that separate from the diff. i have got a bit of a lead though as the bearing has its part number on the side "INA HK 32X39X24". i will start contacting my local bearing companies unless anyone has a better idea/route?

luckily enough the diff itself is solid in place with no movement, its just this centre shaft which connects to the planet gears.

There is a little bit of in and out movement when its all botled up tight, i think there is supposed to be a bit of endplay as the flange cant be butted up tight to the diff, has anyone got a quattro box out of a car they could check, just to see if it does have ant in and out play.
jockthedog

http://simplybearings.co.uk/shop/...=b7f59f6e7a7e7f59a5c40275dd7dcdda

this it? a tenner
jockthedog

youll need a new flange tho - or visit a scrappy
super-ron

jockthedog wrote:
http://simplybearings.co.uk/shop/...=b7f59f6e7a7e7f59a5c40275dd7dcdda

this it? a tenner


yep thats the one, was just looking at this one the same price

http://www.bestbearingsonline.co....earing-caged-32x39x24mm-6775.html

so they seem readily avilable. lucky i could make the part number on it.

yes need a flange too, phoned up tps and a new ones 249 +VAT!! so will try and get a second hand good one. in theory if the bearing is fully functioning there should be no wear on it.

you may be able to help me in two ways, the box you stripped down..:

a) did you put it back together, if so do you know if there is a bit of in and out endfloat movement from factory

or

b) did you not put it back together, are you breaking it
jockthedog

a) but not quite together enough to tell you

I'll crack on with it this weekend tho and let you know.
super-ron

I've looked up a few bearings online now and they all look a little bit on the copies side, even though they say genuine INA I'm not convinced. I've spoken to my local bearing shop and they deal directly to INA so are going to find me a price Monday.

I also need a flange as the bearing face is a bit scruffy. Does anyone know of a good used one?


super-ron

Got my bearing direct from INA (was a bit dubious of the ones on line) through my local bearing supplier.

12.49 all in


jockthedog

any luck on the flange?
super-ron

jockthedog wrote:
any luck on the flange?


No I haven't.  I've spoken to a guy who has replaced this and he didn't worry about it and was still going fine for another couple of years before he sold it. So just going to reuse mine.

Worst case sinario if it does trash the bearing is another 12.49 and an hours work, rather than put a new 200+ flange on it just in case.
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