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Thread: Exploded Suspension Polyurethane Bushings

  1. #1
    Aussie Member Tillsy's Avatar
    Join Date:  Feb 2012

    Location:  Adelaide

    Posts:    941

    My VIN:    6679

    Exploded Suspension Polyurethane Bushings

    G'day guys

    On my last drive the rear suspension felt it had a real hash thud to it. I've done some inspections and found something perculious - the top-most polyurethane bushings have exploded.

    When I look at the front ones, they are not looking great - like they have dried out and are on their way to doing exactly what the rears have. I'm guessing the weight of the engine at the rear has contributed to the faster death.

    Has anyone ever heard of this before? The climate here in Australia is much hotter - have they dried out at a faster rate, or is there meant to be some kind of maintenance done on these things? Or were these defective? Purchased from DMC MidWest 2013.
    This is the exploded (top-most) rear...
    Rear Poly.jpg

    This is the dried out (but not yet exploded) front..
    Front Poly.jpg

    And this is the underside of the top of the rear suspension...
    Rear Suspension.jpg
    Chris

  2. #2
    Senior Member - Owner since 2003 Patrick C's Avatar
    Join Date:  May 2011

    Location:  Northern Michigan

    Posts:    1,063

    My VIN:    1880

    Club(s):   (DCO) (DCUK)

    Thatís crazy. Iíve never seen anything like that. Is it possible that the hole in the frame that the shock passes through is enlarged and the shock moved around, rubbing the bushing away and ripping it up?
    Patrick C.
    VIN 1880
    Modifications done to my car can be seen in this video: https://youtu.be/ncMjW2pI2e4

  3. #3
    Senior Member Bitsyncmaster's Avatar
    Join Date:  May 2011

    Location:  Leonardtown, MD

    Posts:    7,722

    My VIN:    03572

    Is the red color the bushing or a grease you used to install?

    "Polyurethanes may crumble due to hydrolysis" This problem seems to show up on shoes left damp.
    Dave M vin 03572
    http://dm-eng.weebly.com/

  4. #4
    Senior Member - Owner since 2003 Patrick C's Avatar
    Join Date:  May 2011

    Location:  Northern Michigan

    Posts:    1,063

    My VIN:    1880

    Club(s):   (DCO) (DCUK)

    Quote Originally Posted by Bitsyncmaster View Post
    Is the red color the bushing or a grease you used to install?

    "Polyurethanes may crumble due to hydrolysis" This problem seems to show up on shoes left damp.
    The AVO shocks come with red bushings.
    Patrick C.
    VIN 1880
    Modifications done to my car can be seen in this video: https://youtu.be/ncMjW2pI2e4

  5. #5
    Senior Member BABIS's Avatar
    Join Date:  Sep 2012

    Posts:    490

    My VIN:    4502

    this is the same thing that happened to a friend of mine last summer. AVOs bought when available for the first time, about 8-9 years ago. they were also leaking badly..
    VIN 4502

  6. #6
    Member
    Join Date:  May 2011

    Location:  Cape Cod

    Posts:    37

    My VIN:    10769 1246

    It happened to the lower front ones on 1246 after only 3 years. Same red color ones,

    The lower front ones cracked and fell out last summer on 1246 after only 3 years. Same red color ones and they are not cheap.

  7. #7
    LS Swapper Josh's Avatar
    Join Date:  Mar 2013

    Location:  SK, Canada

    Posts:    2,022

    My VIN:    11408

    Club(s):   (TXDMC) (DOI)

    Stick with the plain old black rubber bushings.

    5.3L LS4 + Subaru 6spd 314whp/348ft-lbs
    Getting it back on the road!
    LS Swap

  8. #8
    Aussie Member Tillsy's Avatar
    Join Date:  Feb 2012

    Location:  Adelaide

    Posts:    941

    My VIN:    6679

    Good grief so this WAS a failure waiting to happen - and to think the suspension was one of the few items I've got from DMC that hasn't failed in one way or another.

    Heaven help anyone ever buying a "new build" from DMC should they ever eventuate - I legitimately fear they will kill someone one day

    So what rubber bushings do I need then?
    Chris

  9. #9
    Senior Member
    Join Date:  Feb 2015

    Posts:    106

    Quote Originally Posted by Tillsy View Post
    Good grief so this WAS a failure waiting to happen - and to think the suspension was one of the few items I've got from DMC that hasn't failed in one way or another.

    Heaven help anyone ever buying a "new build" from DMC should they ever eventuate - I legitimately fear they will kill someone one day

    So what rubber bushings do I need then?
    Rubber bushings:
    https://www.deloreango.com/us/rubber...shing-kit.html

  10. #10
    Aussie Member Tillsy's Avatar
    Join Date:  Feb 2012

    Location:  Adelaide

    Posts:    941

    My VIN:    6679

    Quote Originally Posted by JETS 81 DMC View Post
    They're not for the top of the shock obsorbers?
    Chris

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