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Old 07-19-2005, 02:22 PM   #1
PowerMatt
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Default Rotating grinding noise

The latest issue for my aging Legacy GT has come up. Whenever I take a left turn that is just quick enough to lean the car over a bit, I get a rather lound whirring grinding noise (it sounds like something that is rotating is grinding on something). Once the car is travelling straight again, the noise becomes intermittent and gradually fades out. Any ideas? Maybe a wheel bearing is going?
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Old 07-19-2005, 02:35 PM   #2
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Either your brakes or wheel bearings.
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Old 07-19-2005, 03:35 PM   #3
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Good to know, at least those are fairly simple and cheap to fix.

--edit--

I love the way the Haynes service manual phrases the section on checking wheel bearings. They should never need servicing, but you should check them every 60k miles anyway.

Last edited by PowerMatt; 07-19-2005 at 03:49 PM.
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Old 07-19-2005, 07:01 PM   #4
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sounds more like a tire rubbing to me
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Old 07-19-2005, 07:25 PM   #5
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...could be CV boots(which bust all the time down here in the desert on me) or possibly viscus coupling(more likely if low speed and 'humping' when turning) issues too...just ideas if you haven't pinned it down yet...

but does sound like the bearings.

Good luck!

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Old 07-19-2005, 11:39 PM   #6
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I've got the same noise on my 98 GT, had the dealer look at it and they believed it had to do with dirty brakes or hard tires. not bearing noise.
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Old 07-20-2005, 03:44 AM   #7
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I thought it was possibly tire rubbing as well, but I can't find anything to support that, and it's more of a metalic sound. That also wouldn't explain while it still does it for a short time once I'm going straight again. The left CV boot is easily visble through the engine compartment, and there doesn't seem to be anything wrong with it. Brakes are also something I thought about, I'm going to check them out in the afternoon (assuming it doesn't rain, again...)
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Old 07-20-2005, 03:52 AM   #8
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Have a bunch of friends come over. Have them sit on that side of your car while you have the wheel turned to the side. Should help you figure out if it's rubbing.
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Old 07-20-2005, 11:10 AM   #9
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Quote:
Originally Posted by PowerMatt
Brakes are also something I thought about, I'm going to check them out in the afternoon (assuming it doesn't rain, again...)
now that I think about it...i bet its your brake pad wear indicators...set of new pads and I bet you're good to go.

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Old 07-22-2005, 02:39 PM   #10
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Funny how you say you're going to get around to these things and it takes a few days. Anyway...

I did the bearing test as described in the Haynes manual. There's absolutely no in and out play in either the front or rear wheel on the left side. The rear left sounds like something could be rubbing on the rotor, though. Next, I take off the left side wheels to check the brakes (when it's cooler).
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Old 07-22-2005, 03:28 PM   #11
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If you know the pads are okay, I’d put my money on the wheel bearing. Better to get it replaced NOW too… I drove on a failing wheel bearing to long and it ended up seizing and taking the hub with it, which is an extra $100 bucks worth of parts…
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Old 07-22-2005, 07:29 PM   #12
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Was it doing the same thing mine is? And did you ever check to see if there was any free-play in the wheel?
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Old 07-22-2005, 08:09 PM   #13
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Yeah, it was clearily evident it was going bad. Started off just a faint grinding sound from said wheel, almost like a brake pad was dragging. Then it got noticeably louder, just as you had indicated, when you turn shifting the weight from one side to the other, it would get louder. This is due to more of the weight ridding on the inner or outer bearing. Then one day, it got really loud which the after examination concluded was when the bearing seized and the hub was actually spinning within the bearing race… not good…
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Old 07-23-2005, 01:40 AM   #14
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Just out of curiosity, how much did it cost in all? I've looked around and it seems the bearings themselves are pretty cheap. I imagine the majority of the expense is in the labor.
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Old 08-01-2005, 11:55 PM   #15
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I have this same issue with mine except its when i take a right turn.
I replaced the wheel bearing and the sound did not change. The cv boot is fine and the joint seemed smooth when i changed the bearing. I couldnt find a source of tire rub and the sound did not change when I got new tires. It hasnt gotten worse so I have decided to live with it until it gets worse.
I was wondering if one of the differentials was making the noise but i dont have to turn sharp at all to make the noise, just get the weight to shift ever so slightly.
Anyway, Im just glad that I am not the only one with the noise.

I think I paid about $70 or so for the wheel bearing and for pepboys to press it into my upright and I did the rest of the install myself
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Old 08-02-2005, 02:22 PM   #16
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It started out with sharp left turns only, but now it's doing it on just about any left turn. I've checked my brakes, and gone over just about everything in the wheel area checking for evidence of rubbing/grinding. I can't find a thing. I'm going to have someone else look at it once I have some money, so I'm still pretty clueless as to what exactly it is right now.
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Old 08-02-2005, 04:11 PM   #17
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If it is your wheel bearings, have them done way sooner than later. I limped home on a really bad wheel bearing one day and it turns out the bearing overheated so badly it basically heated up the whole corner of the car (hub, brakes, shock, etc). It was a super-bitch to get any bolt off that corner. After torching several of the bolts for what seemed like hours, I finally got that corner apart and the hub off to change the bearing out. I preventatively did the other front wheel bearing and it took me all of about 45 minutes to get the hub off.

Then again, if it's not your wheel bearing, disregard everything I just said

JD
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Old 08-02-2005, 04:43 PM   #18
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the fact that the noise happens more when you are turning leads me to believe it is a bearing. brakes have the noise happen more related to speed and bearings make the noise more related to turning. Not always the case, but that is the norm... the turning puts more force on the bearing which enhances it's problem. as it gets worse, the noise will happen with less turning force, until it finally happens going straight and then just siezes up...
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Old 08-02-2005, 05:16 PM   #19
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This thread has my interest as I too am having a left front mystery noise.

History: LF wheel bearing went (quite) bad and had it replaced. The wheel being loose, caused the brakes to grind a 1/4" x 1/8" groove in the LF rotor. I expected that the rotor was done, and so replaced the front rotors with Powerslots and Hawk pads.

Now, whenever the wheels are turning right (event the *slightest* bit), there is a metallic clicking. Wheels straight, and it (almost always) goes away -- it remains like 10% of the time.

The gotcha: Light brake application and it goes away. Let off the brake, it's back. A mechanic and I have both looked at it, and nothing looks awry.

Ideas?
- Eric
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Old 08-03-2005, 01:29 AM   #20
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Eric Maybe one of your calipers is sticking very slightly ?
Does it do this on SLOW speed turns, but not at speeds above 25-30 MPH ?

My Legacy GT has been making a metallic rubbing sound I *think* from the left rear, when ever I take a hard right. I have always attributed this to a possibly loose exhaust hanger somewhere, or maybe a loose heat shield but I have never really checked it out.
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Old 08-05-2005, 01:24 AM   #21
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Not sure of the speed issues. It's rare that I'm turning right at speeds higher than 35... I've heard the incessant clicking at near 60 going straight. It could well be a caliper, but when checked, everything seemed stable.

I hate pulling up to the guard station here with the squeeks and clicks. It's embarassing -- as though I don't maintain my car... Bahh.
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Old 08-11-2005, 04:52 PM   #22
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Been a while, but I finally have new info on this. The local Toyota dealership (no Subaru place in town) thinks that it's my rear rotor heat shields that have been making the noise. They're both slowly rusting away, and the one on the right side is considerably wrose than the left. I didn't think they could be at fault, but the Subaru place that's about 40 miles south of me thinks that's what it is as well. The good news is this is also a fairly inexpensive repair.

On a side note, this will be the last time I go to my local Toyota dealership. They wanted $1200 to do basically the entire brake system (by the way, what's the point of brake pad shims? they're missing from all my pads, but the brakes are entirely silent). I was very tempted to tell them to shove it as I walked out.

Last edited by PowerMatt; 08-11-2005 at 06:57 PM.
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Old 08-11-2005, 05:38 PM   #23
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I'll fly down to FL and do all your brakes for that price
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Old 08-12-2005, 04:04 PM   #24
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I have the same grinding noise when i turn left also. all is good when going straight or turn right.
This all happened right after i switched out my stock rear anti sway bar to a beefier perrin sway bar. after the install when i took it for a little drive, it was when i first heard it, i tried to spray all kinds of lubricants to all parts of the sway bar, but did not lessen the noise at all, my guess it that noise came from somewhere else but caused by the heavier sway bar. maybe i'll have to disconnect it to see if the noise would go away.
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