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Rear ARB knock, knock....
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Paulc2017
 


Member Since: 12 Oct 2017
Location: Stockport
Posts: 154

United Kingdom 2015 Discovery 4 3.0 SDV6 HSE Auto Santorini BlackDiscovery 4
Rear ARB knock, knock....

Well, it’s been a few weeks now since I sold my D3, so I’m just working through a list of items on the D4 to bring it up scratch.

One things is a knocking that I have at the rear, the car has covered 55k of “friendly” mileage as prev. owner used to just use it for skiing trip and long drives generally.

The knock is most prominent on our lumpy track from the house, when the vehicle rolls side to side at low speeds, certainly sounds like the ARBs at the rear. I seem to remember on my D3 there was a “mod”, roughly speaking it was three overpriced squares of rubber I purchased from the stealers, they sat under the ARB and prevented the knocking.

I have searched but cant find reference to this issue on the D4 so wondered if anyone had other suggestions before I get under the thing.

Cheers.
  
Post #196890730th Jul 2018 10:10 am
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Bardley
 


Member Since: 02 May 2018
Location: Hertfordshire
Posts: 437

United Kingdom 2011 Discovery 4 3.0 TDV6 HSE Auto Santorini BlackDiscovery 4

The rubber will be the anti roll bar bushes then..?
Two front and two rear usually. Two bolts for each rubber. (Maybe One on the D4?)
Fiddly rather than difficult. Copper slip the bolts on refit as always.

LR015336 rear

LR018346 front
 2011 MY D4 HSE
Previously 2001 D2 TD5, 1996 D1 300Tdi, 1985 90 2.2 petrol.
Bikes! KTM, BMW, British, Classics and others.
 
 
Post #196891630th Jul 2018 10:28 am
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Paulc2017
 


Member Since: 12 Oct 2017
Location: Stockport
Posts: 154

United Kingdom 2015 Discovery 4 3.0 SDV6 HSE Auto Santorini BlackDiscovery 4

Thanks. Thought is sounded like the same thing. I think I have two of them somewhere, came as a kit of four indentical as I seem to remember ?
  
Post #196892430th Jul 2018 10:47 am
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Bardley
 


Member Since: 02 May 2018
Location: Hertfordshire
Posts: 437

United Kingdom 2011 Discovery 4 3.0 TDV6 HSE Auto Santorini BlackDiscovery 4

Possobly a kit- but Dia. Different front/rear.. so fit the right ones to the correct bar.
 2011 MY D4 HSE
Previously 2001 D2 TD5, 1996 D1 300Tdi, 1985 90 2.2 petrol.
Bikes! KTM, BMW, British, Classics and others.
 
 
Post #196894730th Jul 2018 11:54 am
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Paulc2017
 


Member Since: 12 Oct 2017
Location: Stockport
Posts: 154

United Kingdom 2015 Discovery 4 3.0 SDV6 HSE Auto Santorini BlackDiscovery 4

Cheers. Thought so

Thanks for advice folks
  
Post #196895430th Jul 2018 12:11 pm
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Paulc2017
 


Member Since: 12 Oct 2017
Location: Stockport
Posts: 154

United Kingdom 2015 Discovery 4 3.0 SDV6 HSE Auto Santorini BlackDiscovery 4

Bardley wrote:
The rubber will be the anti roll bar bushes then..?
Two front and two rear usually. Two bolts for each rubber. (Maybe One on the D4?)
Fiddly rather than difficult. Copper slip the bolts on refit as always.

LR015336 rear

LR018346 front


Just read in full, on the discovery 3 there was an additional flat piece (not the arb) which was designed specifically to prevent the knocking, ie not as a result of ARB failure
  
Post #196895630th Jul 2018 12:14 pm
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Paulc2017
 


Member Since: 12 Oct 2017
Location: Stockport
Posts: 154

United Kingdom 2015 Discovery 4 3.0 SDV6 HSE Auto Santorini BlackDiscovery 4

Spoke to dealer. Flappy flat rubber bits don’t apply on the 4. So I’ll investigate before order replacements.

55k on a three year old seems a tad premature.
  
Post #196896030th Jul 2018 12:22 pm
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Paulc2017
 


Member Since: 12 Oct 2017
Location: Stockport
Posts: 154

United Kingdom 2015 Discovery 4 3.0 SDV6 HSE Auto Santorini BlackDiscovery 4

Quick update. Popped to local garage, rear drop links were goosed. So the ride is reassuringly firmer now, but same knock Sad so its back to plan A. Prob why it was plan A in the first place ! Arbs.
  
Post #198256211th Sep 2018 7:05 pm
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Paulc2017
 


Member Since: 12 Oct 2017
Location: Stockport
Posts: 154

United Kingdom 2015 Discovery 4 3.0 SDV6 HSE Auto Santorini BlackDiscovery 4

It killing me now. Arbs swapped. Very little wear.

Still got the knock. It knocks only when the car rock in a pendulum motion side to side. Anything else I could has missed please. Is there a ballast weight or similar in the rear end it could maybe be?

Thanks
  
Post #198343914th Sep 2018 2:33 pm
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Gary_P
 


Member Since: 03 May 2016
Location: Kent
Posts: 1505

Ukraine 2016 Discovery 4 3.0 SDV6 HSE Auto Corris GreyDiscovery 4

Harmonic damper?
 Gary
-------------------------------------------

Discovery 4 HSE 2016MY 
 
Post #198345214th Sep 2018 3:54 pm
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Paulc2017
 


Member Since: 12 Oct 2017
Location: Stockport
Posts: 154

United Kingdom 2015 Discovery 4 3.0 SDV6 HSE Auto Santorini BlackDiscovery 4

So. The knock.

After all that, including new drop links (were goosed anyway) and arbs. I finally found th source of the knocking today. Middle seat, second row. Fine when folded flat lol. Just goes to show how noises transmit.

Solved by backing off the mounting bolts on the rear of the seat base to chassis, then slightly pulling the base toward me when tightening it up.

All is good now. !!!
  
Post #199124112th Oct 2018 3:23 pm
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