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Old 03-26-2020, 12:08 AM   #1
ICM257
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Third Center Suppport/ Driveshaft Bearing replacement...help me

I have a 2002 325xi, it has 215,000. I replaced my center support bearing the first time at 176,000, and have needed to replace it within every 20,000 miles after that.... I have made sure to put it on the correct direction, and replaced the guibo flex disk even though it did not how signs of wear, and also made sure the drive shaft was aligned properly when resembling. After this last time I replaced the support bearing, only 3000 miles ago, I also replaced the transmission/transfer case mount to reduce the vibrations to the driveshaft, and I have already started to feel the support bearing going bad again.

My question, is there anything anyone has run into that would continue to cause the support bearing to go out? Is it my driveshaft? Is it other mounts?

Anything yall have seen would help...I really dont want to replace this thing again.
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Old 03-26-2020, 09:58 AM   #2
77'911
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The drive shaft's pressed in joints are probably shot. It will need a rebuild and balance.
regards
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Old 03-26-2020, 10:16 AM   #3
ICM257
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ah... ok so I can rebuild the U-Joints and keep my same driveshaft though? and not have to buy a whole new driveshaft?
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Old 03-26-2020, 01:54 PM   #4
Bhewgs
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Originally Posted by ICM257 View Post
ah... ok so I can rebuild the U-Joints and keep my same driveshaft though? and not have to buy a whole new driveshaft?
Not something you probably want to do in your garage, but that's correct, I'm running rebuilt shafts front and rear at 205k. There are a few companies that will do them, I had my rear through Driveline Services of Portland, and the front was rebuilt through a local driveshaft shop.
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Old 03-26-2020, 02:49 PM   #5
///Mark_D
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Originally Posted by ICM257 View Post
ah... ok so I can rebuild the U-Joints and keep my same driveshaft though? and not have to buy a whole new driveshaft?
The simpler solution is to just get a new drive shaft. They are not manufactured in such a way that it's easy to just swap out the U-joint bearings. The bearing caps are staked in place vs a simple snap ring that holds in the bearing caps like most other u-joints.

What a driveshaft repair shop will probably do is cut the whole u-joint off, yokes and all and replace with an entirely new u-joint. For that effort and the cost of replacement joints you're better off finding a good used shaft from a junkyard.

At 315k miles I've replaced my driveshaft twice. Each time it was 100 bucks for a used driveshaft. Had I paid closer attention to the replacement part I got the first time, I probably wouldn't have had to replace it a second time. The joints were already stiff which meant the grease had already exited the caps and the needle bearings had started to rust and seize up. Eventually that shaft failed when the rear U-joint rusted solid which lead to lots of vibration and a search for a new driveshaft.

For the second replacement I made absolutely sure that there was no play or notchiness and no difficulty moving the joints in any direction. It took me a little while to find a good one that was nice and smooth, but knock on wood it's been 20,000 miles or so with no issues.

Since you're car is an xi I'm not as familiar with that particular rear shaft, but on the RWD cars there is a front and rear u-joint. The rear one tends to be the one that goes bad first.
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Old 03-26-2020, 03:44 PM   #6
jmo69
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Driveshaft specialists seem to do a good job and send you a shipping label to return your core. Someone on here bought an aftermarket one and haven't heard anything bad about it yet.
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