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Date Registered: 07-2019
TOTAL POSTS: 3
Reply | QUOTE
Metallic rattle coming from rear right suspension


Can't for the life of me track down the source of a rattle so seeking suggestions please.

The noise:
Metallic rattle which happens only when hitting large road bumps. I can get it to happen by driving over the bumps which you sometimes find in the centre of the road at junctions which discourage drivers from cutting corners. Sounds as if something is loose inside the trailing arm like a piece of metal or something that's clipped to the suspension that has come loose and is rattling against the suspension as it vibrates up and down.

Possible sources:
I thought it could be rocks in the suspension arms but I've poked and prodded and put an endoscope inside the trailing arms and nothing.
Possibly a cracked spring. I've inspected the spring and it looks fine but could it be the rubber boot it sits in which has worn and is allowing the spring to vibrate against the metal of the arm?
I've recorded the sound so I could share it to asssit with diagnosis.

I've knocked around with a rubber mallet and prodded bits while up on jacks but can't find anything loose.

Suggestions gratefully received.

Also can anyone recommend a good suspension specialist in Adelaide who could check it out?

Thanks

T31 2008 dci 170,000km
21/Aug/2019, 10:54 pm Link to this post Send Email PM   Send Private Message Blog
 
Revhead Kev Profile
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Date Registered: 10-2006
Location: Mona Vale, Sydney, AUSTRALIA
TOTAL POSTS: 6006
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Re: Metallic rattle coming from rear right suspension


Have you checked all linkage bolts to make sure they are tight and torqued and bushes to make sure they are not split ?
I had a trailing arm bolt which came loose once causing a metalic rattle over small corrugations at low speeds.

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Kev X450(c) T30 Guru
03 Titanium Ti T30 Series 1 **MODIFIED**
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23/Aug/2019, 3:59 pm Link to this post Send Email PM   Send Private Message Blog
 
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Date Registered: 07-2019
TOTAL POSTS: 3
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Re: Metallic rattle coming from rear right suspension


Thanks Kev
I haven't checked them but will now.
Cheers
Cris
23/Aug/2019, 8:40 pm Link to this post Send Email PM   Send Private Message Blog
 
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Date Registered: 07-2015
TOTAL POSTS: 197
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Re: Metallic rattle coming from rear right suspension


I had a knocking noise in the back of my car which sounded like something rattling around in the jack compartment that only happened when going over bumps. It turned out it was the L/H/S rear top shock absorber bolt. I had fitted rear springs earlier in the week and although I had tensioned all the suspension bolts, it needed extra tension on it.

---
Eric
X-4282 (c)
Glen Alpine, Sydney
2010 T31 Cvt STL
25/Aug/2019, 11:57 am Link to this post Send Email PM   Send Private Message Blog
 
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Date Registered: 05-2017
TOTAL POSTS: 86
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Re:


Did you find the problem after almost a year?

I'd have removed the spare tyre and look for loose items. Then accessories like the safety screen (if you have one), jack, brace, and anything that could be loose inside. And I'd be most suspicious of anything that has been serviced/repaired recently.

Then suspension- E.g. Remove the rear strut mount covers and look for loose bolts and perished rubber. Then external things like tow bar, and finally suspension items like sway bar links, strut mounts from the underside, worn bushings (you will need to raise the car and use a large pry-bar to exert force on each item in each direction to find the source if it can be wear related. If the car has done >200k, it is nearing the point at which you can expect bush failure, and depending on what you can see, proactively refreshing them all may be a better idea than just doing the odd couple out.

Consider also, wheel bearings, brakes, centre driveshaft support/bearing and of course, struts. They are all connected, so if you do one or two things before doing a wheel alignment, it may will be a good idea to tackle everything that may be wearing and about to follow the source of your noise to the great landfill in the arse end of the earth

Last edited by roid, 2/Aug/2020, 12:28 pm


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05 T30 ST-X Auto
205/75x16 A/Ts on 6.5" ET40
200k: Refreshed suspension,fuel, ignition & cooling systems
Often good & dirty as is lifted 35mm on Sachs Automatics & poly bushings
Northern Sydney, NSW
2/Aug/2020, 12:18 pm Link to this post Send Email PM   Send Private Message Blog
 


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