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RE: Strange humming noise

Sounds to me like wheel bearing, I have similar problem on my Coupe q, going to the mech next week for fixing. Please explain the wild hair and ass thing, not come across this one before.



		-----Original Message-----
		From:	George W. Selby, III [mailto:IsuzuG@prodigy.net]
		Sent:	11 August 1999 08:30
		To:	Quattro List (E-mail)
		Subject:	Strange humming noise

		Just two days ago, my 4kcsq started making a strange humming sound from the 
		front end.  It is definitely road speed sensitive, not engine speed 
		sensitive, and is the same with the clutch in or out, in any gear.

		It is noticable when driving in a straight line, goes away entirely on a 
		right turn, and gets twice as loud on a left turn.  It is not constant, 
		seems to oscillate at centain speeds, like 25, 40, 55, 70, but never goes 
		away entirely.  It vibrates the car slightly, so slightly you can't even 
		really feel it, you can just tell it's there. You can only hear it when the 
		windows are up, when they are down you can't hear it at all, but you can 
		kinda tell its there.  It is really subtle, but quite annoying.

		I jacked up the car, and no CV boots were torn, and I tested the wheel 
		bearings by grabbing the top and bottom of the tire and shaking, and there 
		was zero play.  Could the right wheel bearings still be bad even though 
		they passed the test I normally perform to diagnose wheel bearings?  And 
		how does one change the front wheel bearings in case I get a wild hair up 
		my ass and just decide to fix them?

		George Selby
		78 F-150 400M, 4 on floor, 4x4
		86 Audi 4000CS Quattro