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  #31  
Old 12-28-2020, 01:48 PM
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Quote:
Originally Posted by Crowz View Post
I use this to push the axles out and for anything else that wants to get stubborn.


https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1


The only drawback with it is its HEAVY. I use a jack stand to support the thing when using it.


Looks awesome, don't see how it will help with the bearing but last bearing change the hardest part was getting the axle out of the hub and that would work great!
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  #32  
Old 12-28-2020, 03:42 PM
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Yesterday I did some data gathering. I put the spare on one corner at a time and then did runs at various speeds using a vibration app. The following is what I got:

All measurements are in Hertz

Spare on Left Front
50 mph: 1.56, 2.34, 1.95
60 mph: 49.61, 1.17, 1.56
65 mph: 1.95, 47.27, 2.34
70 mph: 42.97, 30.47, 2.34
75 mph: 38.28, 38.67, 2.34
60 mph: 2.34, 1.56, 1.17
70 mph: 1.95, 42.58, 41.8
75 mph: 39.45, 39.06, 39.84
60 Mph: 49.61, 49.22, 36.33

Spare on Right Front:
40 mph: 33.98, 1.17, 2.34
50 mph: 1.53, 1.17, 2.34
60 mph: 1.95, 1.17, 38.67
65 mph: 1.95, 38.28, 35.94
70 mph: 43.36, 42.97, 30.86
75 mph: 44.92, 38.67, 27.27
60 mph: 2.34, 1.17, 1.95
75 mph: 44.92, 40.23, 39.84

Spare on Right Rear:
40 mph: 1.56, 34.77, 2.34
50 mph: 1.95, 42.19, 1.17
60 mph: 2.73, 2.34, 3.91
65 mph: 1.17, 1.56, 2.34
70 mph: 42.19, 1.56, 1.95
75 mph: 39.06, 1.95, 21.88
60 mph: 1.95, 39.06, 2.34
70 mph: 42.58, 42.97, 42.19

Spare on Left Rear:
60 mph: 1.95, 1.56, 1.17
65 mph: 1.95, 35.16, 46.88
70 mph: 1.95, 2.34, 1.17
75 mph: 44.53, 1.95, 39.06
60 mph: 1.53, 2.34, 2.73
70 mph: 42.19, 29.69, 42.58

The vibration is definitely worse at higher speeds and under load. It vibrates and the vibration decreases noticeably when coming off the throttle. It feels like sort of a wobble side to side as well as a vibration. I checked my guibo and it looks to be basically in good shape except for micro crack. The center bearing looks ok, but I'm not sure how much movement is normal. It does move a fair amount, but I don't see any damage to the rubber. I can't tell the condition of the CV.

Hopefully someone has an idea as to cause as I am about to load up the parts cannon. Drive line guibo, center bearing and CV are first up for replacement.

Thanks for any help and suggestions!
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  #33  
Old 01-01-2021, 06:49 AM
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At 70 mph the tire rotates 14.06 hz.

14.06*3=42.18. Damned close to one of the repeating vibrations but I think the CV axle has 5-6 ball races.

Since the vibration didn't seem to follow the spare I don't think it's bearing or suspension other than possibly any spring component that has a resonance approx 42-43hz and a minor wheel out of balance matching it.

The key to me is the "under power"

That screams "drive train".

Step one; get to reproduce at a lower speed say 40-45 and on a particular Hill on a particular curve up hill slight acceleration.

Once you can find a way to reproduce it (use m/s to force repeatable RPM), then use a different gear everything else the same.

You want to exclude the transmission as the source.

If you get the same shudder at the same speed rise (40 up to 45 as example), even when in different gears it's not likely in the transmission.

14.06*4.1=57.646 (that should be the speed of the drive shafts at 70 mph, which should exclude the guibo unless divide by 3 or 6:

57.65/3=19.217 57.65/6=9.608

Those would be the suspect values for guibo at 70.

You said the csb had some wiggle to it? That doesn't sound right. When I removed and replaced on the e92 I service, I don't recall any wiggle i could impart myself.

If you can move the shaft sideways by hand or even a small prybar I think you've found the culprit.
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  #34  
Old 01-01-2021, 02:20 PM
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Quote:
Originally Posted by andrewwynn View Post
At 70 mph the tire rotates 14.06 hz.

14.06*3=42.18. Damned close to one of the repeating vibrations but I think the CV axle has 5-6 ball races.

Since the vibration didn't seem to follow the spare I don't think it's bearing or suspension other than possibly any spring component that has a resonance approx 42-43hz and a minor wheel out of balance matching it.

The key to me is the "under power"

That screams "drive train".

Step one; get to reproduce at a lower speed say 40-45 and on a particular Hill on a particular curve up hill slight acceleration.

Once you can find a way to reproduce it (use m/s to force repeatable RPM), then use a different gear everything else the same.

You want to exclude the transmission as the source.

If you get the same shudder at the same speed rise (40 up to 45 as example), even when in different gears it's not likely in the transmission.

14.06*4.1=57.646 (that should be the speed of the drive shafts at 70 mph, which should exclude the guibo unless divide by 3 or 6:

57.65/3=19.217 57.65/6=9.608

Those would be the suspect values for guibo at 70.

You said the csb had some wiggle to it? That doesn't sound right. When I removed and replaced on the e92 I service, I don't recall any wiggle i could impart myself.

If you can move the shaft sideways by hand or even a small prybar I think you've found the culprit.
Thanks for all your help Andrew. I ordered a new guibo, new csb and new cv for the driveline. I don't think it is the CV, but I ordered one just in case. I can always return. The guibo shows signs of micro cracking, so, "since I'm in there" I figured I'd swap that out along with the csb. I didn't see any signs of play in the u joint, so I'm leaving that alone as it is a PITA to change and I don't want to unless I have to. I'll update once I get parts in. Thanks again!
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  #35  
Old 01-01-2021, 03:33 PM
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Front Bearing Removal Tool

Like the front tension strut bushings, the guibo can have some pretty big tear that looks like a hairline.

My bet is CSB and that 43hz is it's tuning fork natural resonance.

Wife's car will shudder sometimes going up a freeway onramp and I've been suspecting either csb or front diff (guess which one I hope it is).
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Last edited by andrewwynn; 01-13-2021 at 04:00 PM.
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  #36  
Old 01-01-2021, 06:59 PM
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Quote:
Originally Posted by andrewwynn View Post
Like the front tension strut bushings, the guibo can have some pretty big tear that looks like a hairline.

My bet is CSB and that 43hz is it's running fork natural resonance.

Wife's car will shudder sometimes going up a freeway onramp and I've been suspecting either csb or front diff (guess which one I hope it is).
Front diff came to mind to me as well. I know which one you are hoping for in your case. I'm hoping the same.
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  #37  
Old 01-13-2021, 04:06 PM
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Any update? I'm about to put my new CV axle and refurbished hub back in today. I thought my wishbone arms were spent but the random shudder I got in the steering while braking seemed like it was the bearing which had wobble in it before I replaced it. Had overheated to the point where the bearing cage and outer seal was melted!
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  #38  
Old 01-13-2021, 04:19 PM
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Originally Posted by andrewwynn View Post
Any update? I'm about to put my new CV axle and refurbished hub back in today. I thought my wishbone arms were spent but the random shudder I got in the steering while braking seemed like it was the bearing which had wobble in it before I replaced it. Had overheated to the point where the bearing cage and outer seal was melted!
Unfortunately, I have not been able to get to it yet. Fortunately, I've only been driving around town where the load is not as great and the shudder/vibration much less pronounced. I have the front guibo, CSB and rear CV sitting in the garage ready to go on. I checked the new CSB for movement and it has some, but nothing like the one on the truck. Fingers crossed this is the problem. I hope to be able to get to it in a couple of weeks.

I checked my front wheels for movement with truck up on stands and there is a slight amount of movement, but nothing that would be likely to cause the vibration I've been getting. Still hoping it's not a wheel bearing.
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  #39  
Old 01-13-2021, 05:18 PM
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Wifes X5 vibrates like hell under load or in a turn when the control arm that goes from the front of the car to the hub gets worn. Weirdest thing I have ever seen. The symptoms scream bad wheel bearing when it wears out but there isn't any vibration at a given speed like a wheel bearing. Brakes and turning at speed causes the vibration on hers. Again may not be the culprit but that was what I run into allot on her X5.


The way I spotted it was by not jacking up the car and having someone turn the wheel while watching what has play in it.
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  #40  
Old 01-13-2021, 05:56 PM
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Originally Posted by Crowz View Post
Wifes X5 vibrates like hell under load or in a turn when the control arm that goes from the front of the car to the hub gets worn. Weirdest thing I have ever seen. The symptoms scream bad wheel bearing when it wears out but there isn't any vibration at a given speed like a wheel bearing. Brakes and turning at speed causes the vibration on hers. Again may not be the culprit but that was what I run into allot on her X5.


The way I spotted it was by not jacking up the car and having someone turn the wheel while watching what has play in it.
I'm running poly bushings on those control arms and the other two control arms. I've checked them for play loaded and unloaded and there isn't any. So, I'm pretty sure that's not it.
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