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dublin_101
Member Since: 18 Sep 2015
Location: Melbourne
Posts: 22
  
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| D3 front knocking noise, not bushes..in neutral not present |
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I have a Discovery 3, 2008 4.0 V6 Automatic.
I have had this clunky knock noise, which was only ever present at very low speed, 1-5 klm/h .. normally would hear it in bumper to bumper traffic.
my mechanic looked at it twice and said he couldn't find it, he lifted it up, even things such as the bushes, etc... he said i may have to wait until it gets worse to find it ...he said he may be a drive shaft, but there were 4 so which one..
what i've noticed is that when i am travelling at that very low speed (1-5 klm/h), if i put it into neutral, the noise will stop (after a cycle - so the noise is cyclical, like something is turning and clunk, then clunk)...
tonight i noticed the clunky noise staying present up to a higher speed as well, perhaps up to 20 or 30klms...
any ideas guy? i'm going to try another mechanic now, but am in a rush before christmas to try and find one who has time.
thanks in advance.
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 5th Dec 2019 12:37 pm |
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Globetrotter448
Member Since: 21 Mar 2017
Location: Londonderry NSW
Posts: 1782
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First step, where in the vehicle is the noise coming from - left/right or front/rear as this could make a big difference. If middle of car check rear tail-shaft centre bearing.
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| 6th Dec 2019 2:43 am |
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dublin_101
Member Since: 18 Sep 2015
Location: Melbourne
Posts: 22
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That's a very good question, i cannot pin point the sound from the drivers seat..the noise definitely feels like it is at the front of the vehicle.... and it kind of feels like it is central.
I just took it out again for some testing, i have the below results.
Car running in Drive without foot on gas (so i assume around 5klm/h).
- the knocking is cyclical, and the faster the car goes (e.g slight decline), the knock sound will be more regular (so that could be difference between 3 klm/h and 6 klm/h).
- whilst knocking, if i push to Neutral, the cycle will stop (feeling of disengagement), though later on the knocking will return
- whilst in Drive without foot on pedal, if i turn the steering wheel around 45 degrees, the knock will stop (whilst doing same speed)
- in drive on slight incline, the knock is more powerful (thudders more).
- i can feel the knock in my steering wheel
maybe i should have mentioned, the wheels are 22".
I was lucky to have a quiet day during testing so I took a video where you can see the status and hear the noise...
https://vimeo.com/user105948019/review/377696951/456aeb345a
PS - the Land Rover Workshop is fully booked out until the 20th of December and they go on leave that same day as well.
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| 6th Dec 2019 2:54 am |
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Globetrotter448
Member Since: 21 Mar 2017
Location: Londonderry NSW
Posts: 1782
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Video does not work for me. I would check centre bearing
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| 6th Dec 2019 5:29 am |
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dublin_101
Member Since: 18 Sep 2015
Location: Melbourne
Posts: 22
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this one should work.. thanks.
https://vimeo.com/377696951
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| 6th Dec 2019 6:14 am |
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Globetrotter448
Member Since: 21 Mar 2017
Location: Londonderry NSW
Posts: 1782
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Sounds like a wheel loose or a brake caliper
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| 6th Dec 2019 8:18 am |
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lynalldiscovery
Member Since: 22 Dec 2009
Location: Maidstone
Posts: 7274
 
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I would be giving them props a damned good look at, especially the rear one which has a std u/j at the diff end, when I changed my prop the u/j was as stiff as can be/almost partially seized.
I see someone else has mentioend centre bearing, could be the rubber has had it, quite common.
Cheap fix is sikaflex.
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| 6th Dec 2019 8:20 am |
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dublin_101
Member Since: 18 Sep 2015
Location: Melbourne
Posts: 22
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this is almost getting fun in trying to find... i'm uploading some more videos..
i've asked my brother to come over later on and to walk beside the car...
one thing to note is that my local mechanic said that that he couldn't find the fault and he said that it was hard as when they lift it up on the hoist that all of the weight goes off the wheels/train, etc... i suppose that makes sense, hence why he said wait until it gets worse or try a specialist.
i am like 95% sure it's definitely the front...
but if turning the wheel stops it... could the be the drive shafts from each wheel to the transmission / case (i am not that technical btw)....
i think at times there is definitely two knocks per cycle (so i am thinking its from each wheel - could that be each drive shaft)... assuming drive shaft is that rod between the wheel and the transmission/case..
https://vimeo.com/377736743
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| 6th Dec 2019 9:36 am |
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Globetrotter448
Member Since: 21 Mar 2017
Location: Londonderry NSW
Posts: 1782
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Still like a wheel or something attached to it like a wheel bearing
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| 6th Dec 2019 9:46 am |
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dublin_101
Member Since: 18 Sep 2015
Location: Melbourne
Posts: 22
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my brother busy, but my nephew popped in and he was my guinea pig to walk beside the car...definitely something at the wheel, first he said at the very wheel and then later said something inside ..the front section...
still baffling....e.g i have it in drive on a slight decline, it's making that noise, then i pop it into neutral and it stops as the car free flows down the decline ..
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| 6th Dec 2019 10:07 am |
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aja4x4
Member Since: 14 Apr 2019
Location: Westbury
Posts: 2459
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Sounds like a driveshaft try it on full steering lock
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| 6th Dec 2019 10:45 am |
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dublin_101
Member Since: 18 Sep 2015
Location: Melbourne
Posts: 22
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tried it on full steering lock in a car park and it doesn't click or clunk.
although in the past when exiting from parallel car parking and turn hard (from the spot) it would clunk.
when i had it in Drive without gas on a slight incline, the clunk/knock noise would become more like an actual jolt...
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| 6th Dec 2019 12:30 pm |
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dublin_101
Member Since: 18 Sep 2015
Location: Melbourne
Posts: 22
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I had a friend come around who is a mechanic, he said he believes it to be the transfer case..
i will book it into a land rover specialist to look at .
he said they can be rebuilt or replaced new, depending on the condition...
any ideas what this could cost me?
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| 21st Dec 2019 1:02 am |
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M3DPO
Member Since: 22 Sep 2010
Location: Notts.
Posts: 8072
  
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If it’s worse when turning the steering wheel it’s not the transfer box or prop shaft, more like the front dif., drain the oil and look for metal shards in it. Jack the front of the car(truck  ) up with transmission in neutral and spin one road wheel at a time and see if you can feel or hear anything 
I guess it could be a wheel bearing but a knock like that on a wheel bearing would be horrendous at speed, they usually fail at around 80k miles. It can when others can't,
It will when others won't,
It goes where others don't.
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| 21st Dec 2019 9:11 am |
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dublin_101
Member Since: 18 Sep 2015
Location: Melbourne
Posts: 22
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Just to give everybody an update, this is weird...
well i woke up one morning with a rear left puncture...i took it to the tyre shop and they show me that the rear right had a bulge on the inside side wall of the tyre as well, so, i said just replace both tyres.
they jacked the car up a few times, on each side, etc. etc. and then i drove the car home. this was 6 days ago and since then, the car DOES NOT make any knocking noise anymore.
This is strange, very strange. I have no idea how or what, or will the issue even return, but I'm so curious to understand what could have happened. Could the tyres have been causing issues to the front? Could the jacking up of the car on each side a few times had reset one of the shafts or others? Weird.
I have the car booked in on the 7th January to see a specialist, but let's see if the issue returns. When i turn the wheels to turn left or right (near full turn) it still does make a noise, but it's not related to the under-car noise i was hearing cyclically before.
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| 27th Dec 2019 12:19 pm |
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