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Thread: Loud clicking

  1. #1
    Join Date
    Oct 2004
    Location
    Bay Area, CA
    Posts
    261

    Default Loud clicking

    Hello guys, my 1990 525 is nothin but problems today! anyway....

    I went to go back out of my garage after checking plugs + wires because of a stumble at 2k rpm and I hear "CLICK CLICK CLICK CLICK" from underneath th ebeast. Well, I have someone help me find where it's coming from and its from the back of the car, underneat - around where the differential is located. (or so it seems) but it only does this under weight. With the car jacked up and in drive, mash the gas.. nothing. Drop it back down and heres the noise again. Not constant either, sort of intermittent, but occurs VERY VERY VERY often.

    Any ideas guys?

    Thanks a million.

  2. #2
    Join Date
    Oct 2004
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    Bay Area, CA
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    Default

    Hey guys - the noise is totally gone so I can not check to see if its the CV's. I did get it on jackstands and got the car to "100mph" and played with several RPM ranges and nothing back there looks off.

    However - the driveshaft's center bearing (the rubber all around it) is cracked in several places and you can "shake" the driveshaft by hand. Is this whats causing the vibrations? What do you guys think? Medium pressure with my thumb can move the driveshaft up and down.

  3. #3
    Join Date
    Dec 2003
    Location
    Austin, TX
    Posts
    1,181

    Default

    center bearing is shot. replace ASAP so you dont have to replace the driveshaft!!! do the flex guibo while you're in there if it hasn't been done yet.
    1995 540iA M-Sport - 76k miles. 1 of 1 auto AW3 cars.
    1995 540i/6 - Misc Parts donor for above.

  4. #4
    Join Date
    Oct 2004
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    Default

    Quote Originally Posted by bimmerd00d
    center bearing is shot. replace ASAP so you dont have to replace the driveshaft!!! do the flex guibo while you're in there if it hasn't been done yet.
    I have an auto - so from what I hear theres no flexdisc.
    As for the center bearing, It's a lot of money - I'd hate for it to NOT be the problem. Is it just totally abnormal on these cars to be able to wiggle the shaft?

  5. #5
    Join Date
    Jan 2004
    Posts
    4,150

    Default It depends on how strong you are, medium thumb pressure varies a

    alot from person to person....You can always move the driveshaft up and down even with brand new rubber on the center bearing... Its a question of how hard..And typically when the center bearing goes the rubber is torn out completely not just a few cracks. Odds are its ok.... by the way its a really really bad idea to run the rear wheels unsupported up to 100... The cv's aren't really happy at that extreme angle...Bmw specs that if you run it on jackstands you support the rear suspension so its loaded, so that the cv's are a an angle closer to normal running conditions.







    Quote Originally Posted by Hypr5
    I have an auto - so from what I hear theres no flexdisc.
    As for the center bearing, It's a lot of money - I'd hate for it to NOT be the problem. Is it just totally abnormal on these cars to be able to wiggle the shaft?

  6. #6
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    Oct 2004
    Location
    Bay Area, CA
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    Default

    I understand that its not a good idea, but I really have no real way to test the CV. I figured that if it was bad I'd see it. Anyway... After reading all of this it does seem like the center support is NOT my main problem here.

    I'm absolutely confused - as there is no visual cues of anything being bad except for the cracks in the center support rubber.

    Well thanks for the help guys.

  7. #7
    Join Date
    Jan 2004
    Posts
    4,150

    Default Paul S. had a clicking from one of his cv's awhile back and he

    raised it up and ran it at a low speed also... I seem to recall that his noise went away and that the theory was that by running it at low speed at these extreme angles it redistributed some of the cy joint grease so that a dry bearing now gets lube... perhaps something similar happened to yours.





    Quote Originally Posted by Hypr5
    I understand that its not a good idea, but I really have no real way to test the CV. I figured that if it was bad I'd see it. Anyway... After reading all of this it does seem like the center support is NOT my main problem here.

    I'm absolutely confused - as there is no visual cues of anything being bad except for the cracks in the center support rubber.

    Well thanks for the help guys.

  8. #8
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    Oct 2004
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    Bay Area, CA
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    Default

    at 130k miles, should the center bearing show wear as I have explained or do you guys think something has caused it to wear out like this? Since it is crakced I figure its a good idea to replace it even though it's kind of expensive.

    Thanks

  9. #9
    Join Date
    Dec 2003
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    Austin, TX
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    center bearing is like $75, where's the expensive part?!?!?! get out that toolkit

    http://www.bmaparts.com/item.wws?mfr...21226723%2Ejpg
    1995 540iA M-Sport - 76k miles. 1 of 1 auto AW3 cars.
    1995 540i/6 - Misc Parts donor for above.

  10. #10
    Join Date
    Oct 2004
    Location
    Bay Area, CA
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    Default

    It's just expensive to have nothing that I feel fixed. It's like almost $100 and i'll never know the benefit of it. lol.

    The car is on ramps / stands and everything is apart, I just wish I knew what was making it shake before I go changing out parts.

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