Member Since: 18 Aug 2023
Location: Stockholm
Posts: 10
Agressive sound but car still runs fine...
Hi,
I have a very weird situation that arose yesterday.
2014 D4 TDV6 with 8-gear automatic, 220 000 km (~136 k miles). Last maintenance 2 months ago (1000 km ago) with gearbox oil change + new filter, front and rear diff oil change, transfer case oil change, prop shaft replaced with new, new front arms and bushings (LR stock). Has run perfectly since.
Sequence of events per below;
Drove 150 km in high gear, normal height, without any issues at all. Mostly highway, some rural roads.
Eventually crossed an unpaved snow-covered flat grass field (know the area very well when there is no snow, it's flat without rocks or any obstacles). Went into low gear and Snow program, and raised car to terrain height. No issues. Snow depth ~ 30 cm i.e. mid-high on the wheels.
Snow depressed a bit under centre of vehicle but not much, maybe 2 cm at most.
Came back to the road, into high gear and normal ride height. Car ran just normal for about 2 km, then a whistling noise could be heard, soon followed by metallic scraping sound. Turned off and checked underneath, including bending back the brake shields a bit (considering a loose pebble in-between). No change.
Started up, and noise became metallic banging, rhythmic with speed of vehicle meaning increased banging with higher speed. Sounded like the engine was about to blow...
Stopped, checked underneath and tugged _everything_ in sight, nothing loose, no visible metallic impacts etc, prop shaft is clean and free from the shield, all joints seem OK.
Eventually it turned into a metallic screeching noise, no banging no "impact sounds" just continuous metal-on-metal rasping.
Car runs perfect in idle, revving in neutral no strange sound at all, in gear = Drive with foot on brake and giving gas to ~1500 RPM no sound at all (more than normal engine sound). As soon as vehicle is moving forward or backward the noise is there.
Could not hear any difference turning hard left/right in slow speeds, same scraping sound.
As I was stuck way out from even normal roads (summer cabin area) I decided to drive back to nearest mechanic, 70 km away. Went very slowly and noise continued all the way but did not change volume or tone, still metallic rasping noise.
Noise increase a bit when giving gas, and abated when stepping off the pedal. Came back in volume when giving even slight gas the entire trip.
Fuel consumption was regular, no change, and steering was normal and responsive.
Now handed in to a garage and completed last 80 km home on local train...
Any ideas on what it could be? Wheel bearings? Drive Shafts/joints? Differential? Even catastrophic turbo failure but then I would expect noise when revving in Neutral or in Drive even if at standstill, which there is none?
Best
Johan
4th Dec 2023 5:14 pm
DSL Keeper of the wheelie bin
Member Since: 11 May 2006
Location: Off again! :-)
Posts: 73081
Hub/ball joint/bearing thingie failed?
4th Dec 2023 5:17 pm
johan.danielsson
Member Since: 18 Aug 2023
Location: Stockholm
Posts: 10
Hopefully yes, should be less expensive than a differential (I hope)…
4th Dec 2023 5:58 pm
Worms
Member Since: 24 Sep 2023
Location: Highlands
Posts: 399
Could it be the mid-bearing on rear prop-shaft? If it was worn and the snow pushed the bracket into contact with the shaft?Previously:
2010 FL2 TD4e GS
‘93 Defender 110 200TDi CSW - still got this, non-runner on SORN.
‘87 Defender 90 4 cyl Petrol
‘83 110 CSW V8 - best ever!
Range Rover 2-door V8 (not sure of year - 4-speed box and vacuum diff switch)
Series III SWB Diesel
4th Dec 2023 6:11 pm
johan.danielsson
Member Since: 18 Aug 2023
Location: Stockholm
Posts: 10
The entire prop shaft including the centre bearing (rubber inside a half-circle steel cage) was replaced just some months ago, and looks visually fine.
Member Since: 24 Sep 2023
Location: Highlands
Posts: 399
johan.danielsson wrote:
The entire prop shaft including the centre bearing (rubber inside a half-circle steel cage) was replaced just some months ago, and looks visually fine.
Mine's needing done, so it's uppermost in my mind!Previously:
2010 FL2 TD4e GS
‘93 Defender 110 200TDi CSW - still got this, non-runner on SORN.
‘87 Defender 90 4 cyl Petrol
‘83 110 CSW V8 - best ever!
Range Rover 2-door V8 (not sure of year - 4-speed box and vacuum diff switch)
Series III SWB Diesel
4th Dec 2023 8:23 pm
johan.danielsson
Member Since: 18 Aug 2023
Location: Stockholm
Posts: 10
Well noted 😁
The breaking brake pad sounds plausible and not impossible as it was a mix of screeching and knocking and only when wheels were rotating, will need to investigate this one in depth.
I had this on a car once. Pad broke loose. Lots of banging. Turned into screeching then metal on metal as the pad destroyed itself and ended up with just the back plate scraping the disc. Metal on metal.
4th Dec 2023 8:38 pm
M3DPO
Member Since: 22 Sep 2010
Location: Notts.
Posts: 8225
Seems logical as the traction control would be working overtime in such conditions.
Does the park brake still work ok?- the springs that hold the shoes off the brake drum are known to fail causing the shoes to rub on the drum and create an horrendous noise when moving, although I can’t see any reason apart from coincidence why this should happen just driving in snow.It can when others can't,
It will when others won't,
It goes where others don't.
5th Dec 2023 10:34 am
johan.danielsson
Member Since: 18 Aug 2023
Location: Stockholm
Posts: 10
The EPB works fine, no noise when engaging/disengaging so assume it's still in good order.
I engaged it both in high- and low gear before and after the noise appeared, so don't think it's the culprit...
5th Dec 2023 11:17 am
pwheeldon
Member Since: 14 Jan 2020
Location: West Yorks
Posts: 1504
On my last car I had similar and it turned out to be a broken spring inside the PB, which still worked fine, but the metal was trapped and made an awful metallic screeching noise.Discovery 4 GS 2009 Auto Stornoway Grey
Discovery 3 s 2005 Auto Bonatti Grey Gone
Discovery 3 SE 2005 Manual Zambezi Silver Gone
Range Rover Sport HSE 2006 Black
Aston Martin DB7 VV
5th Dec 2023 11:41 am
johan.danielsson
Member Since: 18 Aug 2023
Location: Stockholm
Posts: 10
The garage just called me back and the diagnosis is pretty clear… the very newly replaced prop shaft had ejected all its grease from the front joint towards the transfer case. Seems it’s pretty locked up and it’s a wonder the car drove as well as it did.
This will require a complete replacement (on the original garage cost…) but I am concerned about the transfer case taking a beating from driving with a locked joint
Also a question if the rear diff can have taken a beating, even if the mid-shaft bushing is intact and the rear joint seems to be intact?
Thoughts on how to check the transfer case integrity?
6th Dec 2023 6:55 pm
Roidster
Member Since: 04 Nov 2016
Location: London/Herts
Posts: 137
What make was the failed prop? Only fit complete GKN or genuine LR (which is GKN).
Prices gone through the roof this year (at least doubled).2005 Discovery 3 HSE
(RLD Wheel Protector, Altox FBH Remote, IID Tool) Viscous Fan spanner’s Available to lend
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