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  1. #1
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    Member No: 101790 twaletta is an unknown quantity at this point twaletta's Avatar
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    Worn clutch?

    Bear with me, I've tried searching this and other forums, but the sheer number of ways to describe a shudder makes searching somewhat hopeless without doing ten different searches with different phrasings, all saying the same basic thing.

    I've got a '99 323 and I'm getting a vibration/shudder, mostly through the clutch pedal. Only when actively engaging or disengaging the clutch do I get any vibration. Any gear, but the higher I go, the less pronounced. If I'm clipping along at any speed, I can usually feel it if I slip the clutch slightly. Nothing felt in neutral when depressing the pedal either. It usually, not always, goes away after a few miles. The more I have to shift, the quicker it seems to go away.

    I'm seeing many say it could be the early signs of a warn clutch, before it loses it's ability to self-adjust. That the right direction?

    Regardless of what it is in the end, if it is clutch, pressure plate, or bearing related, they all get replaced at once. Any troubleshooting I can try to narrow it down? I'm not afraid to tear into it, I've changed enough clutches in my time. I could tear an E30 to pieces and throw it all back together, but am still relatively new to E46s.

    I appreciate any insight.
    J Twaletta (ABAA#00001)


  2. #2
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    Oh yeah . . .

    Apparently my good friend Bentley seems to think the only troubleshooting for drive-train vibrations are in the drive-shaft.

    Go figure, Bentley is usually my first choice for advice.
    J Twaletta (ABAA#00001)


  3. #3
    jayb
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    Re: Oh yeah . . .

    Bentley is very smart, but sometimes he is wrong. He may need to talk to some experts from time to time to compare notes.

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    Sounds like a pressure plate/flywheel issue.

    Pressure plate could be worn, could be some "hot spots" on the flywheel.

    See if the clutch is slipping: find a decent hill and get into a numerically higher gear (4th or 5th) and floor it. This would be the time when it slips. Then you'll definitely know you are going to need a new clutch.

    How many miles on the current one? Any "hard launches" or recent "new drivers" that could result in some incidental spots on the flywheel?

  5. #5
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    Member No: 59049 hoscarnag has a little shameless behaviour in the past hoscarnag's Avatar
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    you're experiencing "clutch chatter"...

    you'll be needing a clutch overhaul very soon. Figure on a new clutch, p/plate, release bearing, and flywheel. If yur lucky you can get by without the flywheel

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    Please include details; always include your

    mileage and any other possible related history. In this instance, do you know the history of this car, the driving style of any previous owners, and your driving style?

  7. #7
    Twaletta
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    Re: Please include details; always include your

    ~135k and is likely due for a clutch. Been at least 50k on the current clutch. Gonna just order a clutch, pressure plate, throw in a guibo and CSB and some other details and call it a weekend project.

    The only thing that worries me is "BMW special tools". I'm seeing something in the Bentley about a tool for the pressure plate. Are there workarounds for these things?

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    Flywheel

    I have had clutch chatter on my 323i almost since the start and I am in the process of changing the clutch. Surprisingly, I have found that the clutch and pressure plate were in reasonably good shape (now 135k miles). However, the flywheel, which is of a dual-mass design, has lots of angular play and must be replaced. Other drivetrain issues that may be related to the chatter include a cracked guibo coupling disk and a busted rear differential mount. We'll see in a few days if all this takes care of the problem.
    Note that the flywheel lists for nearly $1,000. Several online places have it for about $600. Fortunately, I found an eBay seller that has them new for $460 shipped. Search for LuK DMF019.

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