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  1. #1
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    Member No: 115809 ilovecow is an unknown quantity at this point ilovecow's Avatar
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    rear clunking, rattling, whatever, NOISE!

    I just pretty much replaced everything in my rear suspension. Took out the SLS and put in 535is springs and Bilstein HDs (with new shock mounts). Also replaced pitman arms, submframe bushings, trailing arm bushings, and sway bar links.
    I had some kind of rattling (slight clunking) noise coming from my rear left prior to the work, now it's still there! Where could this noise be coming from? It's driving me insane!

    Any advice would be greatly appreciated.
    Thanks.

  2. #2
    Bruce in Canada
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    beer bottle in trunk


  3. #3
    Jack
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    Rear Clunking

    I would guess it is the differential support. It is located at the back end of the differential on top. Easy to replace. When the mount goes bad the center of the diff. mount can move up and hit the under body. Steve Haygood sells replacement. One other thought is the tensionong arms for the trunk lid. The come with spacers to keep them sperated but they fall out. I found I could cut some rubber tubing to keep them seperated and they do not rattle. Hope it helps.

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    Outer CV joint or wheel bearing?


  5. #5
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    Over bumps? In curves...?


    '87 <b>528e</b> "is" 214.5k
    '88 <b>M5</b> 193k (Head removed, ready for reassembly)
    Dinan gen.1
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    Re: Over bumps? In curves...?

    Over bumps. Today I unbolted the rear seats, re-seated them, made sure they were nice and tight. Same noise still happening.

  7. #7
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    What condition are the inboard sway-mounts in?


    '87 <b>528e</b> "is" 214.5k
    '88 <b>M5</b> 193k (Head removed, ready for reassembly)
    Dinan gen.1
    OEM Front & Rear Fuzz-buster

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    Me too!

    I have a similar sounding noise, but it appears to come from the rear right side of car. Hollow clunk when going over certain bumps, and also when I throw it into a hard right turn, I hear a rumbly thun thunk thunk from rear right. I checked my rear seat as well, spare tire, etc. No clue what it is yet.

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    Me too!, too!!

    It's been one of those things low on the priority list, but annoying just the same. Most everything else has been replaced (subframe mounts and diff mount) that I can think that moves.

  10. #10
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    Re: rear clunking, rattling, whatever, NOISE!

    Mine does this from the RR. Especially when going over large cracks in the road at slow speeds. Two years ago I replaced the upper mounts on the rear SLS shocks, also replaced the bombs, as well as sway bar bushings..., and the noise went away for about a week and then came right back.

    My guess, after you've removed everything from the trunk and are sure something isn't rattling around, is it's probably the mounts but your list says you replaced them already. As well as other common items. So where does that leave us.

    Time for a professional opinion I hate to say. Or just live with it as I'm doing. I've adopted two approaches with my old M5.

    1) turn up the radio and enjoy the drive.
    2) if it's serious it will show itself soon enough by falling off.

    Philo.

  11. #11
    wjosh
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    Sway bar Bushings where they mount to the body?

    It looks like you've already replaced the main components, however you did not mention the sway bar bushings themselves. There are two point where the swaybars connect to the body. I would check these to see if they are loose or if the bushings are bad. I am shooting from memory here, but if I remember correctly they have to line up perfectly to get them screwed in. Maybe check to insure they are tight and not loose and the bushings are good.

    Other then that, considering the work you have already completed, I am out of suggestions.

    wjosh

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    Re: rear clunking, rattling, whatever, NOISE!

    I really appreciate all the advice, I'm determined to figure this out.
    I'm going to try two more things this weekend. I'm removing all the tools from the trunk, and I'm going to have the shock mounts removed and reinstalled again.
    If those still don't fix the problem, I may just sell the car and get an E34 M5.


    Just kidding.

  13. #13
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    Now come on, you don't just throw parts at cars to

    solve a rattle. You find it and replace the offender. I wouldn't normally go to the lengths you've gone to replacing everything under the trunk without finding the sound first. Now, if you wanted to do this work anyway, then by all means, but don't doom your car to a frustrated sale because of a clunk that you haven't tracked down yet.

    Don't forget that even a wheel bearing should be considered when tracking down the noise, but I don't mean to say you should replace it and see. I call that shotgun diagnostics, where you blast the car with parts in a bird-shot fashion and hope you plug the problem in the process, even if it is quite by accident.

    Even new parts can make noise, especially when the hardware isn't torqued properly.

    Keep the car!!!
    '87 <b>528e</b> "is" 214.5k
    '88 <b>M5</b> 193k (Head removed, ready for reassembly)
    Dinan gen.1
    OEM Front & Rear Fuzz-buster

  14. #14
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    Member No: 7324 tnkenyon is an unknown quantity at this point tnkenyon's Avatar
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    Put mine up on lift and....

    Nothing!! Had mechanic/friend listen to noise while cornering hard right (thunk thunk thunk), he though it might be an axle issue. Put it up on lift, and we couldn't find anything obviously loose or showing signs of abnormal wear etc. Said if it was axle they would have to remove to find out. I am clueless on rear end pretty much, so I can't say whether he is on to something. I am going to try and get someone to at least locate the noise while going over bumps - I want to see if I can hear it from outside the car. Then maybe the same while cornering hard.

    It seems to me that it occurs when the right rear is unloaded vertically - e.g., going off the edge of "speed table" speed bumps in my neighborhood (single thunk) or cornering hard right (multiple thunk).

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    Re: rear clunking, rattling, whatever, NOISE!

    something inside the spare tire well? did you remove the pump, old lines, mountings? sway bar bushes/links? Brake hose mounting still firmly attached to rear swing arm? exhaust touching subframe? Scottie Sharpe
    84 745i 15 lbs boost, BMWTurboPerformance.com MAF kit, 17x9 3pc BBS, clean underwear, Executive Interior
    88 Dinan-badged M5, M88 motor with 2 row conversion, Dinan Stage 4 suspention, Dinan 17x9.5 3pc wheels, 255/40 Conti Sport X 4, Racing Dynamics software, e34 rear brakes, B&B Stainless steel Exhaust, F&R LaDue stainless steel strut bars.
    67 1602 Ireland coil overs, brembo brakes, Dual Weber 45
    Do you BMWwikiwiki.com ??


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