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Thread: AWFUL noise with solid mounts

  1. #1
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    AWFUL noise with solid mounts

    2003 325i. Welded Diff. Long story short, I installed lowering delrin engine and trans mounts and the result is a very loud and solid clunking noise.
    The noise was noticed while going backwards and steering to the left down the driveway (if that matters)
    Sounds like it is coming from the transmission tunnel or under the passenger floor.
    Car also has delrin subframe mounts, RTAB spacers and delrin diff mounts
    Subframe is reinforced too.
    Only conclusion I can come up with is center support bearing or guibo is tearing under load.

    Thank you for your help
    (2 videos below)

    https://drive.google.com/open?id=11k...GcNbT5GACNuSbR
    Attached Images Attached Images
    Last edited by BryceMotch; 04-09-2018 at 05:56 PM.

  2. #2
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    Forgive the captain obvious question, but have you torqued everything that you loosened?

    Lots of noise is to be expected with solid mounts, to some extent, but more in an amplify-everything sort of way rather than a oh-god-it's-broken way. I can't watch the videos right now, but will try to watch this evening.
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  3. #3
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    Yes. Twice. Two different install days. First Installed the engine/trans mounts only. Backed the car up. Heard the noise and recorded the video.
    2nd day installed the rear end mount bushings and diff mounts, backed the car up again, noise still there.
    I may have the mounts too tight, their torque spec calls for 8-10 ft lbs.

  4. #4
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    The vids sure sound like something is broken/hitting ... not the usual clunking from solid mounts. Your guibo is on it's way out, but that would not be the noise. Are you sure shifter linkeage, or something else is not hitting the driveshaft?

    Edit: Just noticed you said welded diff ... the noise form that could be being amplified through the solid mounts
    Last edited by ScotcH; 04-10-2018 at 11:42 AM.
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  5. #5
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    Is it only when turning the car? If so my vote is the welded diff too.

    In the corners one wheel is going to spin faster than the other, now you can feel that through your drivetrain.
    Last edited by Pat533i; 04-10-2018 at 04:37 PM.
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  6. #6
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    Yea. Welded diff. If I drive it around the block, normal speeds at lock I don't anything other than the "wheel scuff" sounds of a locked diff.
    I noticed and recorded the video while rocking back and forth in the driveway at an angle while turning.

  7. #7
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    If it were me step one would be to pull the driveshaft.
    1) Grab the input yoke of the diff and rotate back and forth vigorously - listen for noise
    2) Grab output flange of the trans (in gear), rotate back and forth vigorously - listen for noise.
    3) If no clanking, start car run trans through gears with no driveshaft - listen for noise
    4) If no noise roll car back and forth with no driveshaft - listen for noise
    5) If no noises surface, replace driveshaft and center bearing

    If your are sure, sure, sure, sure nothing is hitting anything (heat shields, exhaust, etc),,, I think its in your driveshaft somewhere either center bearing or worn / damaged u-joints
    Last edited by jimmypet; 04-11-2018 at 02:15 PM.
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  8. #8
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    Quote Originally Posted by jimmypet View Post
    If it were me step one would be to pull the driveshaft.
    1) Grab the input yoke of the diff and rotate back and forth vigorously - listen for noise
    2) Grab output flange of the trans (in gear), rotate back and forth vigorously - listen for noise.
    3) If no clanking, start car run trans through gears with no driveshaft - listen for noise
    4) If no noise roll car back and forth with no driveshaft - listen for noise
    5) If no noises surface, replace driveshaft and center bearing

    If your are sure, sure, sure, sure nothing is hitting anything (heat shields, exhaust, etc),,, I think its in your driveshaft somewhere either center bearing or worn / damaged u-joints
    Exhaust was cut at the headers and the heat shield has been removed. (photos were taken when removed)

    I was thinking about replacing the guibo and center bearing anyway... but they seem solid vs. some REALLY bad ones I have seen. But they looked okay already. Any reason to upgrade to a RevShift vs stock guibo?

  9. #9
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    If that driveshaft is original - original to the car (like 30 years old),,, I'd swap the whole assembly for a rebuilt unit.
    I have had great luck / results with these guys. I have purchased (3) E30 shafts from them and one for my 318Ti.

    http://www.driveshaftspecialist.com/...0html/BMW.html

    Fast shipping, good packaging and less expensive than the more well known entity you always hear people talk about from the PNW.

    And no,,, if you are still using a trans that needs a guibo, I have always just used a standard guibo even when I run solid mounts everywhere.
    The E30 Gruppe A cars were set up like that so I followed that lead and never messed with the guibo.
    Last edited by jimmypet; 04-12-2018 at 09:13 AM.
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  10. #10
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    So here's an update... the sound also happens (but much more quiet) when the engine is shut off. Clutch chatter? Something in the transmission?

  11. #11
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    Quote Originally Posted by BryceMotch View Post
    So here's an update... the sound also happens (but much more quiet) when the engine is shut off. Clutch chatter? Something in the transmission?
    You mean coasting in neutral, engine off?

    I'd still say, driveshaft, center bearing.
    jimmy p.


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  12. #12
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    Quote Originally Posted by jimmypet View Post
    You mean coasting in neutral, engine off?

    I'd still say, driveshaft, center bearing.
    No, like stop, pull ebrake, car in neutral, turn key off. The last sound I hear is the faint (clunkclunkclunk)

  13. #13
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    Probably axles/CV joints. They will wear out quickly with a welded diff due to the forces going into them, especially since the load direction reverses as you corner. The CV joints will wear on both the accel thrust face and the decel face, which tends to open up tolerances and make them develop very quickly.

  14. #14
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    Quote Originally Posted by Def View Post
    Probably axles/CV joints. They will wear out quickly with a welded diff due to the forces going into them, especially since the load direction reverses as you corner. The CV joints will wear on both the accel thrust face and the decel face, which tends to open up tolerances and make them develop very quickly.
    I don't believe its driveline related now after hearing it when the engine is cycled off. I think its in the transmission/flywheel area.

  15. #15
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    I like what Jimmypet gave you as a list of things to to. Also It appeared the the ujoints are calling you to replace that driveshaft. Did mine last year. Not a whole lot in the flywheel area and you could disconnect the drive shaft from the tranny in a few minutes and confirm front or rear
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