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> More fun stuff to do - wheel bearings?, Not sure what kind of sound they make when going bad
ThePaintedMan
post Nov 19 2012, 04:07 PM
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Has anyone ever had a wheel bearing go bad and recognized it by sound only? I noticed a wierd high pitched, but quiet whine (almost sounded like a very quiet car alarm or beeping) coming from the rear of the car when driving to work on Friday. Yesterday I had a friend drive the car while I drove next to it to see if I could hear it from the outside, and I definitely could. It does not correlate to RPMs, and the sound stops almost immediately when the car drops below 30 mph. The only thing I can think of would be wheel bearing, specifically the left rear. Any thoughts? I would get a video of it but I doubt a microphone would pick the sound up well over the wind noise and exhaust.

-George
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SLITS
post Nov 19 2012, 04:12 PM
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Dry / bad bearing usually "grumbles" at you in my experience, but metal to metal contact could whine.

Other .... low tranny oil ....

That's my two guesses!
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jbyron
post Nov 19 2012, 04:12 PM
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Does it go away when turning one direction or the other?
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Rand
post Nov 19 2012, 04:14 PM
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Grumble is a good word. Bad wheel bearings usually growl, not whine. That quiet beeping was your phone in the trunk. (IMG:style_emoticons/default/wink.gif) (IMG:style_emoticons/default/laugh.gif)
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ThePaintedMan
post Nov 19 2012, 04:47 PM
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Lol, I knew this was going to get a few (IMG:style_emoticons/default/poke.gif) . No, turning and braking do not have an effect. Only dropping below 20-30 mph. Its very strange, again, sounds like an on-off "beep" sound, but quiet and more mechanical (but not grinding). I don't *think* it could be tranny fluid, as it was changed and filled less than 2 months ago, but I'll check. Good suggestion though! Any others?
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monkeyboy
post Nov 19 2012, 04:49 PM
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Does the beeping sound slowly get faster with time? Do you owe the mafia any money?
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ThePaintedMan
post Nov 19 2012, 04:54 PM
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Come to think of it I never did pay for that shipment!
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JawjaPorsche
post Nov 19 2012, 04:56 PM
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Just replaced a rear wheel bearing today. Started as a roar then got worse. Here is a picture of the fried bearing.



Attached image(s)
Attached Image
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somd914
post Nov 19 2012, 05:38 PM
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I too have never had a bearing give a metal-to-metal grinding, just a growl almost like bad tire noise.

Out of curiousity does the noise go away with clutch in or coasting in neutral above 30 MPH?

On other cars I've had brake clips (springs) rub the rotor and and squeek at higher speeds, but don't see how that could be with the design of our rear brakes.
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JawjaPorsche
post Nov 19 2012, 05:44 PM
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Jack up the back wheels and grab them. The one with the bad bearing had a lot of play.
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Madswede
post Nov 19 2012, 05:50 PM
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Speedo cable maybe? (IMG:style_emoticons/default/confused24.gif)
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Valy
post Nov 19 2012, 05:50 PM
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QUOTE(SLITS @ Nov 19 2012, 02:12 PM) *

Dry / bad bearing usually "grumbles" at you in my experience, but metal to metal contact could whine.

Other .... low tranny oil ....

That's my two guesses!

(IMG:style_emoticons/default/agree.gif)

Raise the wheel and turn it by hand. Bearings will usually make noise when you do that.

High pitch sounds are usually related to the disk brakes since they have higher linear velocity closer to the disk edge. Remove the wheel and check for something interfering with the disk (or maybe rim)
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URY914
post Nov 19 2012, 05:58 PM
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Jack it up and turn one wheel at a time.

I've changed bearings on several cars. There are a bunch of how-to threads.
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914itis
post Nov 19 2012, 05:59 PM
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QUOTE(SLITS @ Nov 19 2012, 05:12 PM) *

Dry / bad bearing usually "grumbles" at you in my experience, but metal to metal contact could whine.

Other .... low tranny oil ....

That's my two guesses!

I think I have the same noise on my r/r wheel. How do you grease a dry bearing with everything mounted?
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carr914
post Nov 19 2012, 06:07 PM
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George, I think I have some bearings in my Toolbox
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rohar
post Nov 19 2012, 06:56 PM
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QUOTE(914itis @ Nov 19 2012, 03:59 PM) *

QUOTE(SLITS @ Nov 19 2012, 05:12 PM) *

Dry / bad bearing usually "grumbles" at you in my experience, but metal to metal contact could whine.

Other .... low tranny oil ....

That's my two guesses!

I think I have the same noise on my r/r wheel. How do you grease a dry bearing with everything mounted?


Generally with a sledge hammer. Seriously.
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SLITS
post Nov 19 2012, 07:58 PM
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QUOTE(rohar @ Nov 19 2012, 04:56 PM) *

QUOTE(914itis @ Nov 19 2012, 03:59 PM) *

QUOTE(SLITS @ Nov 19 2012, 05:12 PM) *

Dry / bad bearing usually "grumbles" at you in my experience, but metal to metal contact could whine.

Other .... low tranny oil ....

That's my two guesses!

I think I have the same noise on my r/r wheel. How do you grease a dry bearing with everything mounted?


Generally with a sledge hammer. Seriously.


they are a sealed, double row split bearing. No lube possible. Replace, yes.
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no1uno
post Nov 19 2012, 09:00 PM
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I am experiencing a similar noise. I would also describe mine as a whine more than a grumble. Mine seems to be coming from the right rear. I'm hoping for wheel bearing instead of tranny. I start to hear mine around 30 and up, too. I'll check my tranny fluid this weekend to eliminate that possibility.
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URY914
post Nov 19 2012, 09:32 PM
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Do you hear the noise when your wife is in the car with you? (IMG:style_emoticons/default/smile.gif)
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bandjoey
post Nov 19 2012, 09:53 PM
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See if this fits:

I've searched this several times and there are multiple threads. Starts at over 25mph, and it's a WHOOOaaaaWHOOO oscillating noise, very faint but audible. Search for "Whining noise". Good news, it's not your wife.

Speed does not make this sound change. Braking does not make this sound change. Turning does not make the sound change. Pitch never changes. There isn't a grinding or wheel movement when checking the wheel on a jack,. and the wheel spins freely.

Consensus is a wheel bearing that has not gone bad but will, and finally changing the bearing stops the noise. Sever comments on hearing this for up to 2 years. Mine is going on for a year. Probably rear right on my car. I keep turning up the radio and will do the bearings when the other one starts whining or one starts grinding.
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