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Old 10-31-2007, 03:46 PM
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Driveshaft sticky U-joint question

Hi, I'm replacing my drive shaft support bearing and support bracket as part of other work I'm doing on my W123. I noticed that the driveshaft U-joint is sticky what seems to be in the perfect center of the joints.

And by sticky I mean if I move the parts around - they are smooth until it centers, then it feels like the joint is falling into a groove of some sort. This is the same for all 4 directions of movement.

Does anyone know if this is the special design of the U-joint or a really bad wear? The old bearing was pretty lose and noisy - could have been original from 1982. The support bracket rubber was completely torn up.

Thanks.

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  #2  
Old 10-31-2007, 04:31 PM
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You cant just replace the U joint, MB says you must replace the entire drive shaft I just did a center support and believe I remember my U joint being "sticky" in the center.
A GOOD drive shaft could replace the U joint if need be .
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Old 10-31-2007, 05:09 PM
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Quote:
Originally Posted by russianwol View Post
Hi, I'm replacing my drive shaft support bearing and support bracket as part of other work I'm doing on my W123. I noticed that the driveshaft U-joint is sticky what seems to be in the perfect center of the joints.

And by sticky I mean if I move the parts around - they are smooth until it centers, then it feels like the joint is falling into a groove of some sort. This is the same for all 4 directions of movement.

Does anyone know if this is the special design of the U-joint or a really bad wear? The old bearing was pretty lose and noisy - could have been original from 1982. The support bracket rubber was completely torn up.

Thanks.
Mine was the same way. I replaced the support/bearing/boot/flex discs, and put it back in. No issues so far (almost 3,000 miles since then).
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Old 10-31-2007, 06:17 PM
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Same here, mine seemed to want to stay centered. It still felt tight, it just hung up at one spot. I replaced the bearing and have had no problems or noise at all.
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  #5  
Old 10-31-2007, 06:25 PM
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The u joint rarely if ever flexes in normal operation on a w123. Dont worry about it.

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