↓ Advertise on Defender2 ↓

Home > Technical > Clunk when reapplying power under light load at high speed.
Post Reply  Down to end
Page 1 of 1
Print this entire topic · 
solarider



Member Since: 01 Nov 2021
Location: Godalming
Posts: 11

United Kingdom 2014 Defender 110 Puma 2.2 SW Corris Grey
Clunk when reapplying power under light load at high speed.

I have searched this, but can't find the exact problem listed, so apologies.

I have a 2014 110 2.2 Puma.

When it's under high revs all seems good. However, driving along relatively fast (maybe 50'ish) in 5th and 6th gear, if you ease off the accelerator and then reapply it, there is a noticeable 'clunk' and judder through the drive train. It does judder slightly under load in lower gears too and kangaroos a bit, but the 'clunk' isn't present. There's definitely something slack or worn down there, but I can't quite identify what.


If you reapply the power very gently (unnaturally so) or blend the clutch it seems fine. It is just when you apply power more abruptly (but not so clumsily as you might blame my driving style).

The clutch isn't slipping and it seems to be something to do with the drive itself. Maybe universal joints, prop shaft, half shafts, dif itself or something else. The previous owner used to drive everywhere in very high gears with high torque (setting off in 2nd habitually for example), so I guess that won't have helped!

Anybody experienced the same and what was the cure?

Thanks all!


Last edited by solarider on 25th Nov 2021 10:19am. Edited 1 time in total

Post #931054 24th Nov 2021 10:05pm
View user's profile Send private message View poster's gallery Reply with quote
custom90steve



Member Since: 21 Jan 2010
Location: South West England
Posts: 18450

United Kingdom 

Probably DM’s and drive flanges, ‘fretting’ is a common issue on the splines. On mine the rear went first.

On there I needed new halfshafts and flanges to the rear. Costly! Or you can go 1 piece DMs instead on the rear.
To the front I could get away with drive flanges only, which I did.

Is there any kind of movement when the handbrake is applied that’s excessive? That’s a tel tale.
For play in the rear driveline.
Prop UJ’s are possible too as you say.

If you get under there checking the A frame for play can be worthwhile too but doubt so much it is that.
That’s the two links to chassis and ball joint, worth taking a look if you do take the trouble to have a look anyway. Diesels Lives Matter

Post #931060 24th Nov 2021 11:33pm
View user's profile Send private message View poster's gallery Reply with quote
solarider



Member Since: 01 Nov 2021
Location: Godalming
Posts: 11

United Kingdom 2014 Defender 110 Puma 2.2 SW Corris Grey

Total newbie question sorry, but DMs?

Post #931061 24th Nov 2021 11:39pm
View user's profile Send private message View poster's gallery Reply with quote
Ianh



Member Since: 17 Sep 2018
Location: Essex
Posts: 552

United Kingdom 

DM = Drive member flange. It slides over the half shaft and bolts to the wheel hub. The splines on the drive member and potentially shaft can wear.

Both are a very easy diy replacement. On the rear most go for one piece half shafts

Post #931062 25th Nov 2021 12:44am
View user's profile Send private message View poster's gallery Reply with quote
Grenadier



Member Since: 23 Jul 2014
Location: The foot of Mont Blanc...
Posts: 5402

France 2011 Defender 110 Puma 2.4 DCPU Corris Grey

Don't forget Output Shaft. Type into the search box, huge amounts on what is a very, very well known fault on Pumas. Mine failed (for the second time) just a week or so ago. Based on what you're describing (speed, lifting off and reapplying power, blending the clutch) sounds very similar to how mine failed. Check the other aspects mentioned above (UJs, Flanges, Drive sgafts, A-frame etc) as they can all be done externally, and if they're all tight then OS may be the problem. What KM are you? If you're at 30-40k that seems to be when many fail. Good luck and keep us posted. Thumbs Up

https://www.defender2.net/forum/topic62521.html?highlight=output

https://www.defender2.net/forum/topic81155.html?highlight=output

https://www.defender2.net/forum/search.php...rch_time=0 Monsieur Le Grenadier

I've not been everywhere, but it's on my list.....

2011 Puma 110DC - Corris Grey

Post #931070 25th Nov 2021 7:43am
View user's profile Send private message View poster's gallery Reply with quote
solarider



Member Since: 01 Nov 2021
Location: Godalming
Posts: 11

United Kingdom 2014 Defender 110 Puma 2.2 SW Corris Grey

37k miles.

Local Land Rover specialist (Keith Gott) thought MT82 output without seeing the vehicle based on my description. That's big money and I was clutching at straws for something else cheaper!

The only thing they did say about the output was that it tends to be binary (i.e. it either works or doesn't) and doesn't give much notice, so what I was describing might be something else.

Post #931085 25th Nov 2021 10:18am
View user's profile Send private message View poster's gallery Reply with quote
blackwolf



Member Since: 03 Nov 2009
Location: South West England
Posts: 13711

United Kingdom 2007 Defender 110 Puma 2.4 DCPU Stornoway Grey

There are so many wear points in a late Defender driveline that a clunk such as you describe could be coming from any one (or more) of many places. The most common (not in any order) are:

    clutch driven plate (springs taking on a permanent set, usually indicated by a rattle if the engine is stopped with the clutch in)
    output adaptor shaft coupling (subject of many posts but more prone to total failure than knocking)
    transfer box intermediate shaft bearing wear (more likely to cause rumbling/shrieking noises)
    transfer box centre diff wear
    propshaft universal joint wear (four to choose from) or spline wear (two to choose from)
    differential wear (two to choose from) or imminent failure of front two-gear diff (bad news, can seriously affect control of the vehicle)
    rear drive flange/halfshaft wear (two to choose from, but the short side (offside) tends to wear quicker)
    rear "A"-frame ball-joint wear (a classic source of a knock when cycling the power)
    Suspension bush wear (more commonly rear but front can also cause knocking)
    rear damper bush wear/failure
    Something loose in the cabin rolling backwards and forwards (yes, this really has happened)

Diagnosing a particular knock under the conditions you describe, but doing so without access to the vehicle, is almost impossible I'm afraid. All you can really do is inspect everything, starting wit the easy ones and working through to the difficult ones.

Post #931098 25th Nov 2021 12:11pm
View user's profile Send private message View poster's gallery Reply with quote
Grenadier



Member Since: 23 Jul 2014
Location: The foot of Mont Blanc...
Posts: 5402

France 2011 Defender 110 Puma 2.4 DCPU Corris Grey

solarider wrote:
37k miles.

Local Land Rover specialist (Keith Gott) thought MT82 output without seeing the vehicle based on my description. That's big money and I was clutching at straws for something else cheaper!

The only thing they did say about the output was that it tends to be binary (i.e. it either works or doesn't) and doesn't give much notice, so what I was describing might be something else.


Had you posted this after my first OS failure I'd have agreed. But this time round the failure was exactly as you describe up to the point drive became almost impossible and I limped 10k in third gear with serious feathering of the clutch. But the day before I'd driven 500 kms round trip on the motorway. But the previous few weeks had been ever greater clunking on pick up. I knew it wasn't UJs (checked), I knew it wasn't half shafts (changed two months ago), but it was such a gentle worsening situation I thought it was the clutch rather than the OS.

You can see from my post (first link I sent you) that I was wrong. Big Cry Monsieur Le Grenadier

I've not been everywhere, but it's on my list.....

2011 Puma 110DC - Corris Grey

Post #931101 25th Nov 2021 12:59pm
View user's profile Send private message View poster's gallery Post Reply
Post Reply  Back to top
Page 1 of 1
All times are GMT

Jump to  
Previous Topic | Next Topic >
Posting Rules
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum



Site Copyright © 2006-2021 Futuranet Ltd & Martin Lewis