Clutch shudder today
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This is a discussion on Clutch shudder today within the General Maintenance, Troubleshooting & Accidents. forums, part of the Tech & Modifying & General Repairs category; So, I've always noticed that if I let the clutch out a little fast at low RPM, the whole car ...

  1. #1
    Registered User poly_poly-man's Avatar
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    Clutch shudder today

    So, I've always noticed that if I let the clutch out a little fast at low RPM, the whole car shakes as I start to move - understandable, it seems like the engine's just vibrating in the rubber mounts.

    Today, it happened more often than usual - and at once point, I noticed that it still shuddered when I raised the rpm to about 2k or higher (with the clutch still slightly in) - the whole car shook back and forth quickly. The shuddering did not change speed. I fixed without noticing, I think by pushing the clutch in a little more then letting it out.

    Today it rains. It's about an average temperature. The shuddering doesn't happen every time I start off.

    What's causing the shudder? How do I avoid/get rid of it? I need a new clutch, which I'll replace very soon.
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    Administrator Trainrex's Avatar
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    Not to sound condescending, but you will lose the shudder when you change the clutch.

    Shudder can be caused by many things. Flywheel out of spec, pressure plate out of spec, contaminated disc, or worn out clutch springs.

  4. #3
    Registered User poly_poly-man's Avatar
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    Quote Originally Posted by Trainrex View Post
    Not to sound condescending, but you will lose the shudder when you change the clutch.

    Shudder can be caused by many things. Flywheel out of spec, pressure plate out of spec, contaminated disc, or worn out clutch springs.
    I figured that would be the case. I just wanted to check to make sure it wasn't something simple I was doing wrong with my feet, or some mounts I should change out in particular. Thanks.
    My big thread: The Used WRX Buying Checklist - Please Contribute!

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    Administrator Trainrex's Avatar
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    Quote Originally Posted by poly_poly-man View Post
    I figured that would be the case. I just wanted to check to make sure it wasn't something simple I was doing wrong with my feet, or some mounts I should change out in particular. Thanks.
    Nope, it's not you or your mounts.

  6. #5
    Registered User jd92677's Avatar
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    When you do change your clutch, have the flywheel resurfaced or replaced. I would guess that the extra friction from a slightly slipping clutch is overheating the flywheel
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    Administrator Trainrex's Avatar
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    Quote Originally Posted by jd92677 View Post
    I would guess that the extra friction from a slightly slipping clutch is overheating the flywheel
    And pressure plate, and disc.

    When that clutch comes out, odds are the center of the disc will be blued and there will be multiple hot spots on the flywheel and pressure plate.

  8. #7
    Registered User teflon_jones's Avatar
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    Quote Originally Posted by Trainrex View Post
    Shudder can be caused by many things. Flywheel out of spec, pressure plate out of spec, contaminated disc, or worn out clutch springs.
    If a clutch is new it can shudder too.

    Replace and resurface and it goes away.
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  9. #8
    Administrator Trainrex's Avatar
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    Quote Originally Posted by teflon_jones View Post
    If a clutch is new it can shudder too.

    Replace and resurface and it goes away.
    Yup. It's called a defective clutch.

    In my clutch changing career it has happened three times. All three times a defective disc was at fault. Two Sachs and one Exedy. All three times the disc was warrantied by the parts stores.

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