[patkeefe]

Hi all:

I seem to have developed a screaming from what seems like the left rear wheel. Is there a way to tell if it is the wheel bearing, or the pinions? I have ruled out tire noise.

TIA

Pat

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[DaveN]

Most people say the pinion bearing sounds like a jet engine and it comes from the centre of the car under the back seat. Here's a stupid idea, I have plenty of them <img src="/forum/images/smilies/968/biggrin.gif" class="smilie" alt="" />

Block the front wheels. Put the car on a jack or jack stand raising the left rear side of the car. Get in and start the car, place it in first and let the clutch out slowly. The left wheel is free so it should spin as it has the least resistance, if you have LSD DON'T DO THIS. Give the engine a bif of gas, throw it in neutral and kill the engine. Do you or a friend hear a nasty noice coming from the left rear wheel as it spins to a stop?

Like I said, Redneck Garage 101.

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[patkeefe]

Dave:

I haven't got as far as redneck garage yet. I figured I'd drain the transaxle first, since it appears to have been leaking. It was maybe 1/2 quart or so low.

I can't shake any play at all from the left rear bearing by hand. I am also going to check the right side. After that, I put it in fourth on the jackstands and see what it sounds like. I suppose if I put my sthethoscope on the trans, any problems with the pinions should become apparent?

Thanks!

Pat

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[RS Barn]

Wheel bearing is almost always a knocking noise. Usually driver side if car has had any autocross or track. When you turn right, noise increases.

Whine, wistle, ect is usually a Pinion brg.

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[flash]

the purple car of a local guy here had a low growl that turned out to be the wheel bearing on the driver side - i guess it hadn't gotten bad enough to knock yet - pain in the butt to change too - sent it to a local shop, as i didn't have the bearing tool



still, wasn't a screaming noise by any stretch

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[patkeefe]

Perhaps I overstated it by describing it as "screaming". It is, at least, a growl, which is what led me to think wheel bearing. And, I have autocrossed and tracked the car.

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[flash]

well, as i said, this one was a low growl - i wouldn't even call it a whine

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[tamathumper]

When the rear wheel bearing went in my last car it was a harsh growl or rumble, and it could be made much worse or made to almost disappear if I cornered hard in one direction or the other.



Cornering hard to the right made it worse - and it was the right rear wheel bearing. I would have thought it would be the other way around, but there I go thinking again...

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[patkeefe]

Well, I had the tub on jack stands, and ran it up to about 60 MPH in different gears...no noise at all. I brought it to work today, and it starts making audible noise at about 40 MPH. At 70, it's like a DC-10 riding next to me. Noise is there in any gear, and neutral, clutch in or out. It sounds like it's the left rear.



I believe, from a parking lot test the other evening, that at a constant 20 MPH turning left is quieter than turning right, but that may have been a trick my brain was playing on me, as my wife noticed no difference at all.

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[RS Barn]

Is there a vibration in shifter above 4000 rpm? Is the noise speed based or mph based?

If you end up needing a wheel bearing, contact Max at Provost Motorsport. He has the propper tool to extract and install brg without messing up aluminum control arm.

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[ebarone968]

I seem to be having the same issue. I was concerned about the pinion bearing but it definitely is not a whine or whistle. More like a growl coming from the passenger side rear. I only noticed it recently driving with the top up it became more pronounced. I am fairly sensitive to sounds and I know generally these cars are a bit noisey. Unfortunately I have not had the opportunity to drive another car to compare sound levels.

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[patkeefe]

Pete, is it any worse than changing the wheel bearings on a 911? I have a tool I built to pull the bearings from my Sc trailing arm.

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[RS Barn]

Could be same big tool. The trailing arms are similar

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[tamathumper]

Is this where the ArnnWorx tool is used?



http://www.arnnworx.com/catalog/index.ph...1f74fbd57b

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[patkeefe]

That looks like the tool I built. It seems a good deal at $105.

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[willw]

You might try blasting some oil in the hub from the rear side, just to make sure your replacing the correct bearing. Bearing noise can telegraph through the car and make things confusing.



Also, pinion noise should change depending on drive vs. coast – when you adjust one you have to make sure it’s correctly adjusted for both directions.

If your curious check out this 4x4which I used as a guide to rebuild my Range Rover front axel last year.





Good find on the wheel bearing tool, their a major pain to replace.

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[willw]

Sorry, tried to edit but things went wrong...

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[Grandpa#3]

Hello, I have the Arnnworx Tool for the Rear Wheel Bearing and have used it several times now. It works like a champ and has saved so much down time not to mention the cost of a shop doing the work. I bought the rest of his tools with the exception of the Belt Tension Gage as I have the Porsche P9201 Tool. His Tools are great for the DIY guys.



Cheers,

Larry <img src="/forum/images/smilies/968/smile.gif" class="smilie" alt="" />

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[Kim]

I just did the bearing. I could have sworn it was in the back - I even thought that it was my new tires that were too noisy. It was a front bearing. There is a lot of noise that comes in the back, even originating from the front.

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[SILVY968]

I had this issue with the pass rear wheel bearing. the PM took me out for a drive and you could hear the bearing noise. He had be turn back and forth while driving down a straight road. If it is a wheel bearing, the noise will go away as you turn back and forth as it loads the bearing in a diff way. A pinion bearing noise will not change during this maneuver.

I was going to do both at the same time, but the labor to do each side was way too expensive; as there was no savings to do both at the same time, I will wait until the other bearing goes out to change it.

Brian

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