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  #1  
Old June 9th, 2014, 10:49 AM
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Bearing howling

On my '86 exmod, I've got a howling bearing on the right front. I pulled it apart and expected to find visible damage to the hub bearings, but I did not. I cleaned, inspected, repacked the bearings, put in a new oil seal, and the problem is still there. The noise is intermittent. It's super loud, then goes silent.


It is definitely something on the right front, that rotates. I was thinking it might be the outer bearing that supports the axle shaft. I can diagnose that by pulling the front driveshaft to see if the noise goes away, but then I was looking at the parts manual and I don't see that there are any other bearings there to fail.
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  #2  
Old June 9th, 2014, 10:52 AM
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Quote:
Originally Posted by meatblanket View Post
On my '86 exmod, I've got a howling bearing on the right front. I pulled it apart and expected to find visible damage to the hub bearings, but I did not. I cleaned, inspected, repacked the bearings, put in a new oil seal, and the problem is still there. The noise is intermittent. It's super loud, then goes silent.


It is definitely something on the right front, that rotates. I was thinking it might be the outer bearing that supports the axle shaft. I can diagnose that by pulling the front driveshaft to see if the noise goes away, but then I was looking at the parts manual and I don't see that there are any other bearings there to fail.
I mean, could be the brake pad/rotor?
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Old June 9th, 2014, 11:09 AM
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No. It sounds like wheel bearings with insufficient pre-load wobbling in their races. Like a buzzing vibration. I actually put new brake pads on it when I had it apart to service the bearings.
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  #4  
Old June 9th, 2014, 11:14 AM
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Originally Posted by JSBriggs View Post
How is the bushing in the stub axle? It supports the CV.

-Jeff


Good question. Not long ago I replaced that stub axle and it came with a new bushing. So it should be ok, but I think the stub axle was made in China so that might be the problem.


Is that all there is from the diff outward supporting the axleshaft? There isn't anything inboard of the CV?
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Old June 9th, 2014, 11:20 AM
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Quote:
Originally Posted by meatblanket View Post
Good question. Not long ago I replaced that stub axle and it came with a new bushing. So it should be ok, but I think the stub axle was made in China so that might be the problem.


Is that all there is from the diff outward supporting the axleshaft? There isn't anything inboard of the CV?
nothing between the knuckle and the diff.
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  #6  
Old June 9th, 2014, 11:24 AM
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Originally Posted by Uncle Douglas View Post
nothing between the knuckle and the diff.
Well good. I'm trying to leave on a trip next weekend and I've got to get this fixed. I have all the wheel bearing parts on hand but I really don't think that's the issue. So, I guess I'll order the bushing and maybe even an extra stub shaft (doesn't hurt to have a spare if they are Chinese) and that should cover all the possibilities.
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  #7  
Old June 9th, 2014, 11:38 AM
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So let's assume for a moment that it isn't the bushing in the stub shaft. Does this sound like a CV going out? I'm a Series guy so I've never experienced a CV failure.
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Old June 9th, 2014, 11:50 AM
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Not u-joints. I can actually hear it when I raise the right front and turn the wheel.
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Old June 9th, 2014, 11:55 AM
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Quote:
Originally Posted by JSBriggs View Post
did you pull the races and reseat them?

-Jeff
No, the races looked ok and I left them alone. I didn't think the races would have any tendency to move once seated.
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  #10  
Old June 9th, 2014, 12:03 PM
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Originally Posted by JSBriggs View Post
They shouldn't move, but then again they shouldn't howl either. just thinking out load.

-Jeff


I was thinking to diagnose further I would remove the front driveshaft and see if that would make a difference, but I'd have to remove the drive flanges as well in order to keep that front axle shaft from spinning.
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  #11  
Old June 9th, 2014, 12:08 PM
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Fwiw, I had what I thought was a bad bearing a couple months ago. Turned out to be the center bearing of my drive shaft. Sounded just like a wheel bearing on its way out to me.

Clay
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Old June 9th, 2014, 12:16 PM
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Originally Posted by 1of40 View Post
Fwiw, I had what I thought was a bad bearing a couple months ago. Turned out to be the center bearing of my drive shaft. Sounded just like a wheel bearing on its way out to me.

Clay
I originally thought it was the dust shield on the front out put of the t-case, as that is what it sounds like. However, I could reproduce the noise by spinning the right front with all the other wheels on the ground.

I'm not sure I understand what you mean by center bearing of the drive shaft. Do you mean the slip yoke? Or do you have a double cardan joint?
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  #13  
Old June 9th, 2014, 12:53 PM
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Quote:
Originally Posted by JSBriggs View Post
With only that wheel lifted up, it is spinning the driveshaft. That just might be it.

-Jeff
I'm still unclear as to what I center bearing is. I understand u-joints and I understand slip yokes, but I don't know of any bearing that exists in the driveshaft.
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  #14  
Old June 9th, 2014, 01:01 PM
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Quote:
Originally Posted by meatblanket View Post
I originally thought it was the dust shield on the front out put of the t-case, as that is what it sounds like.
That is what I would have suggested but since you have eliminated it. Damn that disc can make some horrible noises.
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  #15  
Old June 9th, 2014, 01:16 PM
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Quote:
Originally Posted by Uncle Douglas View Post
That is what I would have suggested but since you have eliminated it. Damn that disc can make some horrible noises.
Yes, that one I'm familiar with. Took me a while to figure out.

Tonight I'm going to pull the front drive shaft and the front drive flanges, lock the center diff, go for a drive and see what happens.
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  #16  
Old June 12th, 2014, 12:02 PM
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Some closure on this. Drove the truck sans driveshaft and flanges, no noise.


So I removed the stub axle to check the bush, and discovered that the bush had been spinning in the stub shaft.
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  #17  
Old June 12th, 2014, 12:15 PM
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Quote:
Originally Posted by JSBriggs View Post
Glad you found it. Loctite makes a a product to 'glue' the bushing in place. Although, it makes me wonder if there is enough clearance between the shaft and bushing.

-Jeff
I'll try that when I press a new bushing into the old stub shaft, which I'll keep as a spare.
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