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Large "thump" when accelerating after decelerating
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G_Cam
 


Member Since: 12 Aug 2010
Location: Fife
Posts: 2048

Scotland 2013 Discovery 3 3.0 TDV6 Commercial XS Auto Fuji WhiteDiscovery 3

Could it be the UJ's... it used to be quite common on RWD like the TR ad Spitfires. LOTS of folks used to spend ages and lots of £££ changing props/Diffs etc.... But usually all you needed was a new UJ or sometimes just an oversize UJ circlip costing about 20p

Just a thought...
 1 TR6 Rusting away quietly
1 FARR UTV SOLD
1 International Harvester SOLD
7 x D3 all SOLD
2 x D4 both SOLD
1 x Mrs D4 'Panther' SOLD
1 x Outlander van SOLD
1 continual stream of car parts and me living in the garage... 
 
Post #16518108th May 2016 10:29 am
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Sidestick
 


Member Since: 22 Apr 2012
Location: Rome
Posts: 2286

Italy 2008 Discovery 3 TDV6 HSE Auto Java BlackDiscovery 3

I'm sorry mate what UJ mean? Shocked
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Post #16518128th May 2016 10:40 am
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Dai-Disco3
 


Member Since: 30 Nov 2014
Location: Southend on Sea
Posts: 180

United Kingdom 2009 Discovery 3 TDV6 HSE Auto Stornoway GreyDiscovery 3

UJ = Universal Joint Smile
Changed many of these on a Morris Minor, can this be done on a Disco Prop? Question
  
Post #16518648th May 2016 1:11 pm
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M3DPO
 


Member Since: 22 Sep 2010
Location: Notts.
Posts: 8041

England 2014 Discovery 4 3.0 SDV6 HSE Lux Auto Corris GreyDiscovery 4

If it was a uj surely it would do it in other gear down changes and not just first. I have just calibrated the the transfer clutch as suggested by Disco_Mikey but it still does it, although not as servere.
 It can when others can't,
It will when others won't,
It goes where others don't. 
 
Post #16518808th May 2016 1:55 pm
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Smudger201
 


Member Since: 15 Dec 2014
Location: Staffordshire
Posts: 1

United Kingdom 2008 Discovery 3 TDV6 XS Auto Sumatra BlackDiscovery 3
Klonck on acceleration

Hi , we have a 2008 2.7 discovery 3 same sort of symptoms once accelerate after coasting to roundabout then accelerate again get a klonck / thud type noise!? Thought mounting or UJ /prop but they seem OK .how do you calibrate the transfer clutch ? What's the procedure ? Is it a dealership job?
Regards smudger
  
Post #168579129th Jul 2016 8:46 am
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toaster
 


Member Since: 17 Apr 2013
Location: Herts
Posts: 41

United Kingdom 2009 Discovery 3 TDV6 HSE Auto Stornoway GreyDiscovery 3

This whole thread makes for interesting reading... Thanks guys!

Interestingly, I was crawling along in stop-start traffic today, using the engines idle speed to propel the vehicle. The car in front stopped, so I shifted the gearlever across to manual (mine's an auto) and knocked it down to first gear. This resulted in the same knock that you have all been talking about. I say it's the same, because I have experienced the same issue when approaching a roundabout then accelerating again.

As it seems to be an issue with changing down into first gear, that would maybe explain why a gearbox reset seems to cure it for a while? Is there anything that can be done longer term? If it is an issue with worn syncromesh, why would a gearbox reset help...? Simply thinking out loud!
  
Post #168596329th Jul 2016 4:48 pm
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Disco_Mikey
 


Member Since: 29 May 2007
Location: Dundee, Scotland
Posts: 20713

Scotland 2005 Discovery 3 TDV6 HSE Auto Cairns BlueDiscovery 3

Disco_Mikey wrote:
Thump is exactly as it was before. Does it in sport and auto modes

I know the rear diff is shafted and noisy, so will see how that goes first


Forgot about his thread.

Read diff replaced, still the same thump

Front prop is next on the hit list Rolling Eyes
 My D3 Build Thread

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Post #168603229th Jul 2016 8:32 pm
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M3DPO
 


Member Since: 22 Sep 2010
Location: Notts.
Posts: 8041

England 2014 Discovery 4 3.0 SDV6 HSE Lux Auto Corris GreyDiscovery 4

I travel occasionally (park and ride) on public service buses and they all do it when changing down automatically into first gear, I was on one today and that did it far worse than any Discovery and they are rear wheel drive Shocked
 It can when others can't,
It will when others won't,
It goes where others don't. 
 
Post #168604429th Jul 2016 9:00 pm
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Glassman
D3 Decade 


Member Since: 01 Feb 2009
Location: Heysham Lancs
Posts: 285

United Kingdom 2005 Discovery 3 TDV6 Base 7 Seat Manual Bonatti GreyDiscovery 3

Mines done this same thump noise today, actually 3 thumps in quick succession felt through car coming from the rear when setting off from a roundabout, drove the car a further 60 miles on all types of road and everything seems fine, did anyone find a cause for this?
  
Post #173754521st Nov 2016 8:28 pm
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Go_West
 


Member Since: 15 Sep 2016
Location: Breda
Posts: 51

Netherlands 2007 Discovery 3 TDV6 HSE Auto Stornoway GreyDiscovery 3

I think they all have that thump or clunk noise after certain milage. Had my LR specialist garage take a look at it and they told me it's very common.

I learned how to drive with it. To avoid the clunk, now hear it a lot less.
 -2007 Disco 3 TDV6 HSE Stornoway Grey
-2007 Mini JCW Full Black SWMBO's 
 
Post #173757921st Nov 2016 9:08 pm
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Glassman
D3 Decade 


Member Since: 01 Feb 2009
Location: Heysham Lancs
Posts: 285

United Kingdom 2005 Discovery 3 TDV6 Base 7 Seat Manual Bonatti GreyDiscovery 3

I see the connection with automatics but mines a manual, never experienced this before, has anyone else had this on a manual?
  
Post #173762921st Nov 2016 10:59 pm
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Naks
 


Member Since: 12 Jul 2010
Location: Stellenbosch, Republic of the Western Cape
Posts: 754

South Africa 2011 Discovery 4 3.0 SDV6 SE Auto Fuji WhiteDiscovery 4

mine also has a slight 'thump' under acceleration/deceleration, and when coming to a full stop.

Originally I thought it was the gearbox, so I had ZF do an oil change + reset adaptations, but that did not help.

My indie put it on the lift and we looked around, eventually we saw that the rear prop bracket is quite loose, and you can actually move the prop by hand.

I think all the D4s have this thump, some just have it worse than others Rolling Eyes
 --
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Post #173767622nd Nov 2016 7:50 am
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Discoveringcomfort
 


Member Since: 16 Sep 2015
Location: Berkshire
Posts: 637

England 2005 Discovery 3 4.4 V8 HSE Auto Zambezi SilverDiscovery 3

Hi an update on mine,
I have a brand new LR rear diff and a new rear prop shaft.

As others it stilll does it, the damage to the diff and prop is I beleive because of the thump/bang/play in the gearbox operation not the other way around.

Do BBS do a version of this software update as an independent has told me LR do one for both the V8 engine and gearbox for this?
 Series 1 V8
Series 2 Hibrid V8
Discovery 3 HSE V8 
 
Post #17439944th Dec 2016 5:17 pm
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gstuart
 


Member Since: 21 Oct 2016
Location: kent
Posts: 13563

United Kingdom 2005 Discovery 3 TDV6 Base 7 Seat Auto Java BlackDiscovery 3

reading through this with interest and realise it's getting old , but has anyone been able to get to the bottom of this plse

it sometimes feels like slack being taken up

felt all the props etc and can't feel anything

there isn't a knock but when u take ur foot off the accelerator then back on u can feel like a very slight take up delay in the drive

has anyone noticed it different if u keep off the brakes

slow down without braking , then accelerating again the take up seems less

but if u brake then accelerate again it seems more noticeable

if that makes sense

thks as always guys
  
Post #178386026th Feb 2017 1:17 am
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Disco_Mikey
 


Member Since: 29 May 2007
Location: Dundee, Scotland
Posts: 20713

Scotland 2005 Discovery 3 TDV6 HSE Auto Cairns BlueDiscovery 3

After replacing my front propshaft, the clunk vanished

Upon checking, there is a minute amount of play in each CV joint on the shaft. The clunk is taking up the slack in these as the power is reapplied Thumbs Up
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Post #178387626th Feb 2017 7:36 am
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