Persistent vibration, 87 5KQT

[Grant Lenahan]

Thanx john. Do u ever use Raxles.com?  Own quality. Were the boots not torn?  Grant. 


Sent from my iPod

On Jun 3, 2011, at 3:26 PM, "john at westcoastgarage.net" <john at westcoastgarage.net> wrote:

> The problem appears to have been solved!  Bad CVs at both ends of the driveshaft.  I've not seen that before, but this a business (and hobby) where you learn something every day!  Thanks to those of you who replied with good ideas.  Too many to reply to each of you individually.  I suppose this is gonna show up more as time passes and the cars approach 300 or 400K miles.  BTW, I have a good, but wholesale only, place to get Audi driveshafts reconditioned.  Not particularly cheap, but significantly lower than dealer prices.
> 
> John
> 
> 
> 
> From: John Larson<john at westcoastgarage.net>
> Sender:quattro-bounces at audifans.com
> Date: Sat, 30 Oct 2010 18:41:13
> To:<quattro at audifans.com>
> Subject: Persistent vibration, 87 5KQT
> 
> I'm about at the end of my rope.  I have a customer's well worn, high
> mileage, 5KTQ here that has developed a low pitched humming vibration at
> freeway speeds, although the noise persists as low as 30MPH, maybe even
> lower.  I've checked the axle shafts for bends, replaced a bent RR
> wheel, and aligned the driveshaft with a cool home made fixture.  I
> spoke with a chassis and alignment guy this afternoon (he's gonna drive
> it Monday) and he asked about the wheel bearings.  I've done probably
> 500 double row wheel bearings in my career, and I've never had one sound
> like this.  They mostly howl or make a low frequency rumble, and usually
> (but not always) change tone or volume when side loaded by turning the
> car one direction or the other.  This noise comes on as you build speed
> on the freeway, and is there whether you're going straight or turning.
> The volume, tone, and frequency appear to remain pretty constant.  As
> always, any and all constructive input would be sincerely appreciated!
> 
> TIA!  John
> 
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