[Biturbos4] A whine from the rear

[Grant Lenahan]

your guesses seem reasonable. Never heard of it at this mileage. Check 
the diff opil level?

Grant
On Jul 13, 2006, at 7:57 AM, Chris Newbold wrote:

> No, no, not from my son in the back seat :)
>
> Just shy of 65k miles, and I'm starting to notice a whine originating
> somewhere in the rear. The whine...
>
>   o is loudest between 65-70MPH
>   o is unaffected by gear: 3rd, 4th, 5th or 6th and the pitch is 
> identical
>   o is unaffected by steering inputs
>   o is strongly correlated to throttle inputs:
>      - it stops if you gently lift and coast
>      - it stops if you dip in and accelerate
>      - it returns in steady cruise
>
> The only things which satisfy all of these observations are:
>
>   o rear differential
>   o center drive shaft bearing (do the B5s even have these?)
>
> I haven't heard of any premature differential failures in the B5 S4, 
> and
> it's not like it's very highly stressed (compared to some other
> comonents). But, hey, there's always a first time.
>
> Anyone have any thoughts or comments?
>
> Keman, I don't know if you're still around, but did you see any such
> failures during your time in the shop?
>
> -Chris
> 2001.5 S4 Avant 6spd
>
>
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