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Unexplained knocking noise from rear suspension
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82t   
Sun Jul 15 2018, 08:32pm
Joined: Jan 27 2017
Member No: #2983
Location: Gorey, Co Wexford
 Hi

I've damaged my rear offside suspension, pulling off the tarmac to an unpaved beach car park.

Front crossed over alright, but the rear came down with a bang. Car drove home on motorway without incident, but a long slow left-hand bend produced a knocking sound from the offside rear. This continues to happen, and also sometimes on an irregular surface.

I can see that I have put a 'ding' in the top side of the suspension arm running out to the wheel, where it seems to have hit the bar sitting above it (runs front to back). My mechanic (not a Citroen specialist) can hear the knock, but can't see what is the cause.

Can anyone offer any pointers please?

Thanks


Cillian
keithc   
Sun Jul 15 2018, 09:47pm
Joined: Apr 03 2016
Member No: #2584
Location: Kildare
 Any chance you can post a pic of the damage, might give a better picture (excuse the pun!)
82t   
Mon Jul 16 2018, 01:20pm
Joined: Jan 27 2017
Member No: #2983
Location: Gorey, Co Wexford
 Here's a link to a few pictures showing the damage and the surrounding area.

- Click Here -

and a snapshot of the ding itself, below.

(This car spent most of its life in Scotland - the corrosion down under here is surprising for a car with just over 30,000 careful miles on the clock.)
keithc   
Mon Jul 16 2018, 02:11pm
Joined: Apr 03 2016
Member No: #2584
Location: Kildare
 Looks like the control arm has hit the anti roll bar alright. Must have been some drop to do that. You obviously have that wheel out of alignment now also as that control arm is bent. Hard to know if that would cause the knocking though.
MGmike   
Mon Jul 16 2018, 06:21pm
Joined: May 21 2017
Member No: #3151
Location: South Queensferry
 In one of the pictures it looks like the drop link rubber has been dislodged and perhaps the ball seating has been damaged, this could be the cause of the knock?

I still haven't worked out how it could have rebounded that far! You must have hit that hole pretty hard!
keithc   
Tue Jul 17 2018, 09:36am
Joined: Apr 03 2016
Member No: #2584
Location: Kildare
 You could well be correct MGmike. To bend the control arm like that it would have hit the anti roll bar some whack which in turn could have damaged the drop link.
82t   
Tue Jul 17 2018, 02:53pm
Joined: Jan 27 2017
Member No: #2983
Location: Gorey, Co Wexford
 I think MGMike hit the nail on the head.

On closer inspection today, I see that the drop link has totally separated, so when the car leans the wheel-attached link will plunge down, while the ball unit attached to suspension arm will probably extend in towards wheel. One of those two is obviously knocking on something else.

The link bar has been rubbed clean by whatever motion is taking place - the one on the other wheel is covered in muck top to bottom.

Problem identified. Now to solve it ...
 

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