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Old 02-22-2011, 10:16 PM   #1 (permalink)
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Default Rear strut clunking noise

I recently replaced my rear struts, and afterward I hear a clunking coming from the passenger side rear mainly. Would this be due to bad top mounts? Or the top nut not being tight enough? Any suggestions would be greatly appreciated!
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Old 02-23-2011, 05:58 AM   #2 (permalink)
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check to see if the bolt is torqued to 60 ft lb, then look at a worn/damaged top mount if you still have noise.
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Old 03-04-2011, 08:13 PM   #3 (permalink)
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I'm curious on this one too. I have some clunking in my rear suspension over harsh/sharp bumps and I have checked all the rear control arm bushings, sway bar, etc. without finding any issues. Wondering if it could just be my strut mount(s)?

I replaced the right rear mount a year or two ago because the rubber wore out and the strut rod was rubbing on the metal of the mount, but the left was fine so I left it...maybe it's time to do the left side now?

-Paul
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Old 03-04-2011, 08:36 PM   #4 (permalink)
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90% of the time, any clunking coming from the rear suspension due to a recent disassembly is the cause of worn strut mounts.

The fix is to fill the top and bottom half with 3M urethane.

INFO: Fill Rear Shock Towers to Prevent the "Clunk"
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Old 03-04-2011, 08:43 PM   #5 (permalink)
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Ah yes! I think I remember reading about filling the strut mounts a looooong time ago LOL.

Haven't been very active on the forums for a while...life got busy...

Seems like new strut mounts would cure it too? At least for a while? I've got 93k miles on mine and the clunk has only gotten noticable in the last year or so and not unbearable, just annoying...

-Paul
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Old 03-04-2011, 09:16 PM   #6 (permalink)
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You have to take off your hole rear strut to do this?
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Old 03-04-2011, 09:18 PM   #7 (permalink)
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Yes, the mount has to be removed in order to properly fill it, or to replace it.

In order to remove the mount you must remove the strut and compress the spring.
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Old 03-06-2011, 08:43 AM   #8 (permalink)
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The rear upper strut mounts start to make noise because they've failed. The 'washer' that the strut rod goes through and the nut tightens up against has separated from the rubber isolator within the mount. I've seen some examples where it was severe enough that it came through the mount into the trunk.

I'm not completely sold on the idea of filling the mount as it removes that noisy 'warning' when the mounts have failed. I don't know if a filled mount would give that kind of feedback. I had nearly 80k miles of Rust Belt winters and 5 seasons of heavy autocross on racing tires, so it's not as if they fail quickly (like the LCA bushings do ~35k miles).

Regardless of whether you'll be filling the mount or not, you should replace the mounts in pairs (as with most suspension/steering/braking parts), and absolutely START with new mounts if you are going to be filling them. They're $50-75 a piece so it shouldn't break the bank. You'll have clean surfaces for the filler to bond to as well as the correct alignment of the strut assembly in the strut tower.

Then get a quality 4-wheel alignment.
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Old 03-07-2011, 07:55 AM   #9 (permalink)
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I definitely suggest filling the rears. I did that over the weekend and the car sounds/feels much better.
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Old 03-09-2011, 09:07 PM   #10 (permalink)
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if i get new top mounts, would you guys still suggest filling them? I read that other thread on filling them, and it looks like people were doing it even with their mounts not being worn.
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Old 03-09-2011, 10:13 PM   #11 (permalink)
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I say yes. This is what I'll be doing soon when i get my replacement mounts.
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Old 03-11-2011, 09:52 AM   #12 (permalink)
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Thanks alot guys! I should be doing this sometime next week
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Old 03-11-2011, 11:18 AM   #13 (permalink)
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Quote: Originally Posted by BlackSkittle09 View Post
it looks like people were doing it even with their mounts not being worn.

IMO, you shouldn't consider filling your mounts unless they're new.

I mean you wouldn't like it if someone filled a hole with JBWeld or a big glob of Bondo. On a worn mount, you'd be doing the same with urethane.

Except if it fails here, you may be in for a nasty surprise at speed.

These cars can be a handful if the alignment is off. Worse when they're loose (handling changes).
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Old 03-12-2011, 04:57 PM   #14 (permalink)
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alright, sweet. thanks for the clarification. I just thought I saw in the other thread that people were filling their used mounts still. But, I see where you're coming from on the whole filling thing! My dad works in auto body, and I'd be pissed to find someone just filled a hole with a glob of bondo! haha
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Old 03-14-2011, 05:26 PM   #15 (permalink)
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I just replaced my factory shocks with the Koni inserts. After that I noticed the rear clunk, I'm assuming with my factory shocks being blown that's the reason I never got the clunk before? Anyways I'm going to be replacing the rear strut mounts later this week and will post back with the results.
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