Fleagle_UK
Member Since: 10 Jul 2009
Location: England
Posts: 86
  
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| Sort of grinding / groaning from underneath |
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Folks - I wonder if you can help
Last few weeks have heard a noise coming from underneath the car. It's clearly more audible when you are trailing or off the accelerator altogether though it can also be heard when accelerating.
It's difficult to describe the sound - I wouldn't describe it as a drone or a whine, more a groaning with definite high speed pulsing within the noise (imagines how knackered cogs might create that rhythmic noise as they spin fast)...gulp !
The noise is road speed related not engine speed. Best case, I was hoping for wheel bearing(s) but my experience of them going on other cars is more of a drone type of noise. Worse case I guess it's a diff, transfer box or something on the output side of the auto gear box.????
Should also add if the car is stone cold, say overnight, it takes a mile or so for the noise to start ie time to warm up.
Hopefully will get chance in a couple of days to check for play in wheel bearings, but beyond that I dunno - certainly dont want to be paying expense of replacement drive train stuff.....seems most shops these days just wanna replace whole units rather than take apart - blueprint / diagnose / fix and refit. 
thanks
Last edited by Fleagle_UK on 21st Mar 2012 5:48 pm. Edited 1 time in total
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 6th Feb 2011 9:34 am |
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anglefire
Member Since: 09 Mar 2010
Location: In the Club House
Posts: 4180
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I had a quiet groaning type noise which I thought was from the front either bearing or diff - garage couldn't find anything at the time, or even hear it - but last week my rear wheel bearing collapsed - its being replaced next week and hopefully that will stop the noise as well.
They replaced the other three at the end of last year, so it was probably on its last legs then and the weekends antics finally killed it! Mark.
2006, D3 SE Auto - gone but not forgotten.
2014 BMW 530d M Sport Tourer.
1977 Triumph Spitfire 1500
_________________________________________________
Disco Picture Website Here
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| 6th Feb 2011 9:47 am |
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Fleagle_UK
Member Since: 10 Jul 2009
Location: England
Posts: 86
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I should add btw that it is most prevalent at lower speeds particularly as I slow to a stop.....It may well carry on at higher speed but it perhaps gets masked / blended by other normal road noise.
thanks
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| 6th Feb 2011 8:18 pm |
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thorgal
Member Since: 26 Nov 2008
Location: on the east side
Posts: 541
  
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If it takes a mile to actually hear it , it could be a wheel bearing as they usually need some time to worm up, even for further diagnostics by auto shop, it could be more prominent when turning as well as coasting with no foot on accelerator, since you change a load geometry on bearings.You could try to switch to Neutral , while driving on quiet road and listen to that noise, if it is still there, that would mean no drivetrain problems. Noise at lower speeds, especially pronounced at 40-45 MPH would lead to potential DIFF. problems, for some described as airplane cockpit , sort of metallic noise or even as hollow, metallic
I also have a pulsating , rumbling noise, but it is there from the start, especially when driving and there , when I switch to Neutral.
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| 6th Feb 2011 9:01 pm |
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hughes_jh
Member Since: 09 Jan 2011
Location: Warwickshire
Posts: 294
 
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Unnecessary quote removed
Might still be diff related if he still gets the noise when coasting in neutral?
Also,does it vary on cornering??
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| 6th Feb 2011 11:33 pm |
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lukesky7
Member Since: 23 Jul 2010
Location: Sydney
Posts: 53
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i have a similar problem - when i take my foot off the gas and then back on again (mainly lower gears) it makes this moaning noise (sort of like a lower Chewvbacca noise without the growling) and then is gone once i put my foot back down. its like its trying to find the right gear and then there is a bit of a delay.
took it to LR specialist and they couldnt hear the noise.
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| 7th Feb 2011 1:08 am |
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Fleagle_UK
Member Since: 10 Jul 2009
Location: England
Posts: 86
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Not sure how the box being in neutral and the noise still there means that that it wont be drive train related????
If its in neutral the wheels are still driving the diff, which is turning the transfer box which is turning the output shaft of the gear box. ???  Sorry if I've missed your point.?
I should add btw that is does still make the noise when in neutral.
turning the front wheels / going round a corner seems to make no difference to the sound.
Previously it took a mile or so to warm up before the noise. I noted this morning it was doing it straight from cold.
Last edited by Fleagle_UK on 21st Mar 2012 5:48 pm. Edited 1 time in total
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| 7th Feb 2011 12:31 pm |
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thorgal
Member Since: 26 Nov 2008
Location: on the east side
Posts: 541
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By drivetrain I meant tranny internals, sorry.
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| 7th Feb 2011 9:41 pm |
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character
Member Since: 01 Jan 2008
Location: wiltshire
Posts: 5781
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| Re: Sort of grinding / groaning from underneath |
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Fleagle_UK wrote:Folks - I wonder if you can help
Last few weeks have heard a noise coming from underneath the car. It's clearly more audible when you are trailing or off the accelerator altogether though it can also be heard when accelerating.
It's difficult to describe the sound - I wouldn't describe it as a drone or a whine, more a groaning with definite high speed pulsing within the noise (imagines how knackered cogs might create that rhythmic noise as they spin fast)...gulp !
The noise is road speed related not engine speed. Best case, I was hoping for wheel bearing(s) but my experience of them going on other cars is more of a drone type of noise. Worse case I guess it's a diff, transfer box or something on the output side of the auto gear box.????
Should also add if the car is stone cold, say overnight, it takes a mile or so for the noise to start ie time to warm up.
Hopefully will get chance in a couple of days to check for play in wheel bearings, but beyond that I dunno - certainly dont want to be paying expense of replacement drive train stuff.....seems most shops these days just wanna replace whole units rather than take apart - blueprint / diagnose / fix and refit.
thanks
Neil.
Neil let me put yer out of yer misery..... transfer box, over £1000 OEM part  Get them to drain the transfer fluid (approx 1 litre) to confirm, BTW yer noise will get lounder over the comin miles, exact same symptoms as mine, all wheel bearings checked, least its not the gearbox 
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| 7th Feb 2011 10:00 pm |
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scholsio
Member Since: 02 Feb 2011
Location: Lincolnshire
Posts: 5
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Front wheel bearings becoming a fave for these sort of complaints
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| 7th Feb 2011 10:04 pm |
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character
Member Since: 01 Jan 2008
Location: wiltshire
Posts: 5781
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and what odd are yer givin
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| 7th Feb 2011 10:06 pm |
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packingstrips
Member Since: 24 Mar 2010
Location: uk
Posts: 435
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I thinks its a dangerous game to play to assume that everyone who experiences a problem must have a similar issue than someone on the basis that they have just had a failure. Disco 3's are historically very difficult to diagnose regarding noises as there so many possibilities. Wheel bearings, transfer box and diffs are all a possibility but replicating the drive noise on the ramp wheels free is very difficult.
Transfer boxes always contain a certain amount of swarf in the oil and going by this alone could result in a costly wrong diagnosis. Unless you can hear the noise from the t/box then i would doubt this was the issue at the moment.
Aslong as there is no movement in the wheel bearings, they are not rough or noisy when spun up on the ramp and no noises can be heard from diffs and t/boxes then you need to let this fault develope.......if you dont you will probably end up fitting something which isnt needed....one thing for certain if it is one of these items its going to get alot worse.
Good luck ...hope you get to the bottom of it.
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| 8th Feb 2011 1:34 pm |
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Fleagle_UK
Member Since: 10 Jul 2009
Location: England
Posts: 86
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Thanks all for your help and suggestions.
I did do a little test last night. I found a quiet road and went about 25 mph. The noise was there and pretty constant.
I steered to the left and then to the right to shift the weight of the car from side to side. As I steered to the right thus shifting the weight over the passenger side, the noise went quiet (almost vanished). As I steered to the left moving the weight over to the drivers side, the noise came back was more pronounced. This change in suspension geormetry and the movement of the various forces makes me think (in fact hope!!!  ) that this is an indication of wheel bearing on drivers side rather than drive train issue. ??
When going round corners though, you notice no difference but I guess the lower speed and lower centrpetal force acting on the car mean the suspension / wheel hubs are not getting the same load.
Still not had chance to get the car on stands to test for bearing movement - hopefully tomorrow.
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| 8th Feb 2011 1:58 pm |
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packingstrips
Member Since: 24 Mar 2010
Location: uk
Posts: 435
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Yes that is consistent with a wheel bearing problem
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| 8th Feb 2011 4:59 pm |
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Fleagle_UK
Member Since: 10 Jul 2009
Location: England
Posts: 86
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ok ... so I have my answer I think.
I put front of car up on stands to get at the front wheels. Lots of play (top to bottom) on passenger side bearing and nothing at all on the drivers side - it was sweet as a nut. So we have our culprit.
Would do the work myself but I just dont have time at the moment. so booked in on friday. I have to say that it surprised me going off what I said in my earlier post about loading the weight on to the drivers side caused more noise and when on passenger side there was none....I would have put money on it meaning that it was the drivers side bearing that was kaputt.
Whats the norm on these cars, will the main stealer extract and replace the bearing (usually a time consuming pain) or will they want to replace the full hub assembly in the interest of ease and speed ?
thankfully its appears not to be a drive train issue ...phew! 
Last edited by Fleagle_UK on 21st Mar 2012 5:48 pm. Edited 1 time in total
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| 9th Feb 2011 1:15 pm |
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