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  #11  
Old 08-19-2019, 09:34 AM
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Already jacked it up in the air and had my son drive it and the noise does not reproduce while all four wheels are up. It is only under load. Braking or coasting in gear (it's a stick shift) or in neutral no noise. Only when applying light to moderate acceleration.
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  #12  
Old 08-19-2019, 10:45 AM
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You do the front or rear guibo? I had a clinking metallic noise under accel only. Did a full front and rear drive shaft service (2 flex disks, rear center support bearing, and greased the shaft spines) and everything is nice and quiet now.
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  #13  
Old 08-19-2019, 11:26 AM
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Front guibo only. This is a 3.0i 6 speed manual and I have just under 100k miles. The spline on the front driveshaft had surface rust but looked otherwise great so I did grease it before replacing. It is possible I did not grease it sufficiently I guess.

The noise is very hard to pinpoint on origination. I had my son drive it down my street and I leaned into the engine bay while he drove :-) and it seems like it's coming from the drivers side and toward the front. I can't say 100% on this as it could be sound waves bouncing and fooling me.

The sound is not clinking - more of a metal-on-metal grinding or dragging type of noise. Something could be vibrating just right to make it sound like this. I am a little hesitant it is the guibo on the rear as it's not really a clunk/clink type noise but maybe I'm missing?

Thanks! T
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  #14  
Old 08-19-2019, 12:20 PM
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If it's coming from the front... Like you, I doubt it's anything on the rear shaft. How do your axles look/feel? Wheel bearings? Something simple like a brake heat shield being bent?
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Nav, Pano, Sport (Purchased 06/14 w/ 109,000 miles) (Sold 8/15 w/121,000 miles)


2006 X5 4.8is Build 11/05 Maintenance/Build Log
Nav, DSP, Pano, Running Boards, OEM Tow Hitch, Cold Weather Pckg (Purchased 08/15 w/ 90,500 miles)

2010 X5 35d Build 02/10
Nav, HiFi, 6 DVD, Sports Pckg, Cold Weather Pckg, HUD, CAS, Running Boards, Leather Dash, PDC, Pano (Purchased 03/17 w/ 136,120 miles)
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  #15  
Old 03-29-2020, 11:29 PM
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Dusting this off...

Dusting off this thread... With the weather getting nice and me not getting this fixed I wanted to take another educated crack at this. Also, have had a little extra time on my hands these past two weeks Any ideas appreciated!!

I created a short video of the noise:
https://www.youtube.com/watch?v=ZhMKDTm-TEc
And a video of the front driveshaft as the spline end looked like it should not have been wobbling like this: https://www.youtube.com/watch?v=q0UxlfrPD-I
(recorded this while it was on jackstands)

Could it be the center support bearing? Found these threads while researching further:
When the noise happens:
  • Normal to moderate acceleration in gear (not decelerating)
  • Does not matter the MPH/speed (easier to hear it when going slower)
  • Not related to braking (applying or not applying brakes does not make a difference)

When the noise does not happen:
  • Raised the vehicle in the air on jackstands and drove it up to 25MPH on speedo and cannot make the noise happen

Troubleshooting so far:
  • Replaced front guibo (was not in bad shape) and greased driveshaft spline (was in tact with light surface rust)
  • Replaced both belts, all tensioners, all pulleys
  • Had my son drive it down the street with the hood open, laid on top of engine and tried to detect the noise; it ďsoundsĒ like itís coming from the driverís side
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  #16  
Old 04-01-2020, 05:06 PM
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Bump - any ideas? Before investing the significant time and $ on the center support bearing which is where I'm leaning I'd greatly appreciate any wisdom. Having a hard time diagnosing exactly where the noise is coming from since it won't do it when on jackstands in the garage :-). Thanks!
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  #17  
Old 04-01-2020, 05:47 PM
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A CSB failure will usually present with a knocking sound (and banging/vibration if very bad) as it wobbles in the carrier due to rubber surround coming apart. I would think if the CSB bearing itself had failed it would screech while on jack stands also.

That screeching noise is new to me. Nothing definitive to tell you on the driveshaft but it doesn't look right to me either. Sorry.

LOL, could you run over your phone while recording video or something at low speed? Or have a go pro (or your phone) mounted under the truck while driving?
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Nav, Pano, Sport (Purchased 06/14 w/ 109,000 miles) (Sold 8/15 w/121,000 miles)


2006 X5 4.8is Build 11/05 Maintenance/Build Log
Nav, DSP, Pano, Running Boards, OEM Tow Hitch, Cold Weather Pckg (Purchased 08/15 w/ 90,500 miles)

2010 X5 35d Build 02/10
Nav, HiFi, 6 DVD, Sports Pckg, Cold Weather Pckg, HUD, CAS, Running Boards, Leather Dash, PDC, Pano (Purchased 03/17 w/ 136,120 miles)
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  #18  
Old 04-01-2020, 10:01 PM
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Quote:
Originally Posted by trhaverstock View Post
I created a short video of the noise:
https://www.youtube.com/watch?v=ZhMKDTm-TEc
The only thing I hear in that video is a surge of wind noise and shakes from your unsteady hand.
The only thing I see in that video is a violently shaking road from your hand not holding the camera steady.

You're not testing the symptom correctly. You said it's a grinding under load. You lifted the truck and idled it at 25mph without any load.

Try repeating the test, get up to 25 mph, then load the brakes and throttle up the engine to increase as much load as you can without stalling so you get the noise. Have someone go under the truck with a mechanics stethoscope to determine if the issue is in the differential, transfer case or transmission. And drive shafts, center bearing.

Once you pin point the source of the noise, check fluid level. If it's low, you have a leak, and found a potential cause. You can try to fill it with new fluid to the right level, but it's unlikely to solve if the issue is damage on the gears. Next you need to remove and disassemble the component, and inspect the gearing and bearing for damage.

My opinion is that it's a damaged thrust bearing at the end of the the counter shaft or main shaft. When you load helical-cut gears, they create axial loads, so when the gearbox is loaded, you're getting bearing noise.

Quote:
A growling noise can be caused by bearings that are worn and badly damaged. Bearings can wear due to lube contamination.

Usually, bearing damage has occurred throughout the transmission, so growling can be an indication that a complete overhaul will be necessary.

Growling can also be caused by timing issues. If a weld cracks or a key breaks on the countershaft, a gear may shift slightly. This results in a tooth spacing error.
Here's a good resource once you get it apart.
https://www.rexnord.com/contentitems...108-010_manual
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  #19  
Old 04-02-2020, 01:42 PM
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Sounds like a bearing starting to fail somewhere. I would suspect the cbs bearing based upon the evidence presented. If this was my truck I would saturate both sides of the cbs bearing with wd-40 or the like then try to duplicate the sound with the load on it of course. If itís less audible or non-existent then youíve found your problem. If not then either then probably a differential bearing or even potentially a wheel bearing.
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  #20  
Old 04-02-2020, 01:46 PM
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Grab your front axles, and wiggle them. If you can get a clunk out of them, they are effed, and most likely the noise.
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