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  #1  
Old 09-03-2018, 04:40 PM
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Clunk in the Trunk

2009 E70 X5 35d 80k miles — A week ago I hit a sharp pavement transition in a road construction area (across the road). Since then we have had a clunk in the trunk..err cargo bay. It is pretty loud. Sounds like someone is hitting the body with a rubber hammer once or twice each time we run over even slightly rough pavement with the right rear wheel. After removing EVERYTHING (including the spare tire) from the rear, the clunk is even louder.

I’ve done a physical/photo inspection with the X5 on jack stands and see no obvious broken or loose parts. The exhaust hangers are in good shape. I dropped the plastic panels that cover the fuel tanks and the tank straps are tight. The suspension bushings “look” good. But I know “looks” can be deceiving, especially with BMW bushings that can be fluid filled.

But I’d like to eliminate the easy stuff first. So I’m thinking I’ll start by replacing the rear shocks, including the:
1- upper guide support - 33 52 6 776 557
2- lower guide support - 33 52 6 776 399
3 - bump stop - 33 53 6 6 773 236
4 - bump stop sleeve - 33 52 6 776 132 ?????

https://www.realoem.com/bmw/enUS/sho...diagId=33_1378

But before I place the order, do you have any tips/tricks/recommendations?

Thanks in Advance - Funf Dreisig
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  #2  
Old 09-04-2018, 01:07 AM
ard ard is offline
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Maybe try disconnecting parts to see if it changes/eliminates the clunk? Just thinking out loud. Like the sway part ends; maybe the shock? wire it to the side... just to drive over a few bumps/downthe block

Also, the control arms take a massive pounding. Look carefully at each side, see if you can detect any variation in the bushings.
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  #3  
Old 09-04-2018, 05:58 AM
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Your shock might be blown and the wheel is bouncing?
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  #4  
Old 09-04-2018, 09:47 AM
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Thanks ard & robnitro.

I did a pretty through visual inspection of all of the rear suspension bits on both sides. I even took close up flash photos with my iPhone for parts/angles I couldn’t easily reach/see. Both sides look the same. But the top of the shocks are hidden, where the upper and lower guide supports and bump stop fit up into the bump stop sleeve.

So today I think I’ll start by removing the right rear shock to get to see if it or the guides etc. are obviously shot.

Has anyone installed beefier shocks (e.g Bilstein Sports or Koni’s) on a E70 35d with stock 18 in wheels? Did you enjoy the results?

Funf Dreisig
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  #5  
Old 09-04-2018, 10:46 AM
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Koni fsd sound nice balance but I'm not sure if koni still have rusting issues.
There's a bilstein for non sport which is pretty close to oem they say.
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  #6  
Old 09-04-2018, 02:28 PM
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No joy

I completely removed the right rear shock. There was no visible damage to either of the orange guide supports or bump stop and the shock had no “play”. I took it for a test drive over small bumps in our neighborhood. The noise was exactly the same without the shock as before. There is only one more suspension item that can be easily removed — the sway bar. I may try that this afternoon.

But I’m leaning toward another possibility — the fuel filler hose that runs down the right side between the body and the plastic fender well. Real OEM shows that it is held in place with 2 brackets with plastic “nuts”. Maybe one of the nuts came off . So the filler tube is hanging loose and bangs into the body on bumps

Has anyone had a problem with the filler tube coming loose?

Funf Dreisig

Tip: there is a 6mm hex socket in the end of the shock shaft to keep it from turning when installing the top nut. BUT.. there isn’t much room. So I partially removed the cargo bay tie down rail to get a standard allen wrench under it and into the end of the shock shaft.
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Old 09-04-2018, 05:56 PM
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If there's no change in noise with shock removed, that could be the issue. It should get louder in that corner without a shock to stop bouncing.
Shocks may feel stiff but internally be blown at high rebound/compression. Try swapping sides if it's easy.
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  #8  
Old 09-04-2018, 07:37 PM
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Quote:
Originally Posted by robnitro View Post
If there's no change in noise with shock removed, that could be the issue. It should get louder in that corner without a shock to stop bouncing.
Shocks may feel stiff but internally be blown at high rebound/compression. Try swapping sides if it's easy.
Thanks for your thoughts robnitro.

The shocks could probably be swapped temporarily. But they have tabs to hold the brake lines that make them only fit correctly on one side. If I knew the clunk wasn’t a serious problem, I’d start replacing stuff, starting with the shocks, till the clunks went away. But I’m running out of time before we really need the X5 working well.

I reinstalled the right shock and removed the rear sway bar completely. The clunks did not change on the test drive I got in the back with the seats down while my wife drove over the test bumps at 20 mph. The clunks are very distinct and occur in rapid succession: clunk or clunk-clunk, or clunk-clunk-clunk depending on the size of the bump (roughly 1-2in asphalt road patches). It really sounds like something is loose under the rear seats and bumps into the frame when we drive over the small bumps. I may take out the rear seat again to see if, by removing the styrofoam fuel pump covers, I can hear/localize the sound better.

FWIW I didn’t try getting to the fuel tube because of the number of “break & replace” plastic fasteners.

Funf Dreisig
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  #9  
Old 09-05-2018, 02:00 PM
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You checked the subframe bushing?

My isht has a lot of clunks as well. I made a few adjustments to the hatch and I'm changing out the rear shocks next week. Not sure if it's really the shocks, but at 123k miles, I'm better off replacing it now then waiting til it completely breaks down...
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  #10  
Old 09-06-2018, 12:05 AM
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Quote:
Originally Posted by noelskii View Post
You checked the subframe bushing?...
These are photos of the four rear axle carrier bushings. The x5 was lifted with a service jack under the differential and lowered onto jack stands at the rear, side lift points. The service jack was left in position under the differential with no load for saftey.

In reviewing them, it looks like the axle carrier is very close to contacting the body on the left rear IMG_7646.jpg.

Tomorrow I’ll check to see if this is still true when the X5 is not on the jack stands.

Funf Dreisig
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