NoDo$h
Joined: 02 May 2006
Location: Decapod 10
Posts: 5487
 
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While the D3 is in for a service I’ve asked the dealer to look into a transmission whine that rises with road speed, not engine speed, and is most noticeable at 50-60mph. The dealer has checked the diff oil and there are not metallic particles in evidence, so it looks like the diff is off the cards. I was beginning to think I might be imagining it, but the loaner I’ve got while mine is in definitely doesn’t make this noise.
Can anyone think of any other likely causes for a droning, whining noise that increases in pitch and volume with road speed, not engine speed, and is more noticeable when accelerating? As it’s road-speed dependant I’m thinking it may be on the output side of the gearbox, possibly something resonating? All ideas gratefully received. Don't Panic! Everything will be fine.... inflation is only 2.5% 3.0% 3.3% and the flying pigs are carbon neutral 
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 Thu May 08 2008 2:09pm |
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Gareth
Site Moderator
Joined: 07 Dec 2004
Location: Bob the Builders 'ere
Posts: 9359
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Tyres? Wranglers especially well known to drone in the later stages of life, but the scorpions on mine are moaning a bit now. Silver TDV6 HSE
Pepper White Cooper S Convertible
Old English White MGB GT
Ex Military 109 Series 2a Soft Top
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| Thu May 08 2008 2:18pm |
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ronp
Joined: 29 Nov 2006
Location: Over the Edge!!
Posts: 3726
 
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Transfer Box??
I had a whine when it was around 3 months old.
First I had to really listen for it [I thought I might be trying to hear something that wasn't there].
Then over time it got louder and louder, so much so I couldn't drive it and it was off the road awaiting a new transfer box.
Been fine now for the last 3 years. .
Morphy Richards 450w "Dual" Food Processor
[complete with addittional bowl and changeable blades]
Only £19.99 at a store near you!
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 "The BEAST"
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| Thu May 08 2008 2:27pm |
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NoDo$h
Joined: 02 May 2006
Location: Decapod 10
Posts: 5487
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Hmm... Scorpions, about mid way through their life. Doesn't sound like tyre noise, although "moan" is closer to the noise than "whine". It's almost like the sound of the early moments of a jet engine spooling up and is most audible when accelerating, less noticeable on a trailing throttle and as good as absent when decelerating.
Because it's not dependant on revs I'm considering every element of the transmission from the output side of the gearbox through to the tyres, but the way the noise appears when the car is under load has me leaning towards something mechanical/fluid not being right.
If the dealer can't find the source I'll swap a couple of the wheels/tyres for two new ones I have in the garage and see if the noise continues. Don't Panic! Everything will be fine.... inflation is only 2.5% 3.0% 3.3% and the flying pigs are carbon neutral
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| Thu May 08 2008 2:29pm |
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NoDo$h
Joined: 02 May 2006
Location: Decapod 10
Posts: 5487
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Cheers Ron, I'll ask them to look at the Transfer Box too  Don't Panic! Everything will be fine.... inflation is only 2.5% 3.0% 3.3% and the flying pigs are carbon neutral
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| Thu May 08 2008 2:30pm |
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AndrewS
Tarquin of the Desert
Joined: 06 May 2005
Location: Earth
Posts: 5735
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Rear passenger wheel bearing For use of a 4x4 site and driver training pm me 
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| Thu May 08 2008 3:04pm |
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NoDo$h
Joined: 02 May 2006
Location: Decapod 10
Posts: 5487
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It's a thought. A wheel bearing would match the noise and the fact that the rear lightens when braking would be a good match too. What's kept that low on the list of possibles (for now) has been that there is no variance in pitch or volume whether going straight or around a bend, when usually a bend in the road would lead to the faulty bearing making more noise when loaded up in the corner.
Just to add to the list of conditions, the noise is also present when I put the 'box in neutral. Don't Panic! Everything will be fine.... inflation is only 2.5% 3.0% 3.3% and the flying pigs are carbon neutral
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| Thu May 08 2008 3:24pm |
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AndrewS
Tarquin of the Desert
Joined: 06 May 2005
Location: Earth
Posts: 5735
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Jack it up and give the wheels a wobble...... In a safe manner of cause. For use of a 4x4 site and driver training pm me
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| Thu May 08 2008 3:42pm |
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NoDo$h
Joined: 02 May 2006
Location: Decapod 10
Posts: 5487
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I'll chock the wheels properly then  Don't Panic! Everything will be fine.... inflation is only 2.5% 3.0% 3.3% and the flying pigs are carbon neutral
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| Thu May 08 2008 3:56pm |
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ronp
Joined: 29 Nov 2006
Location: Over the Edge!!
Posts: 3726
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Small point, but I would have thought the front bearings would go before the rear?
Then again, my rear discs went before the front??
Anyway - are wheel bearings covered by warranty? .
Morphy Richards 450w "Dual" Food Processor
[complete with addittional bowl and changeable blades]
Only £19.99 at a store near you!
.
.
.
"The BEAST"
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| Thu May 08 2008 4:51pm |
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SteveNorman
Joined: 14 Oct 2005
Location: Somerset
Posts: 60
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you are right, you can usually pick up wheel bearings when cornering, & they are usually as noisy decelerating, as accelerating.
Regards
Steve
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| Thu May 08 2008 8:16pm |
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Maverick
Joined: 25 Jul 2007
Location: Aberdeenshire!
Posts: 1414
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Have you got a sunroof? Or is it more mechanical whine? Happiness is a vectored thrust! (As seen on a Harrier GR3)
 1980 Series 3 restoration - Mine
 Very dirty 1996 Defender 90 - Soon to be mine!
 Stornaway Grey D3 HSE - Dads!
Formerly Hobbs!
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| Thu May 08 2008 8:20pm |
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simon
Joined: 11 Jan 2005
Location: You'll never know
Posts: 13668
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I also get transmission whine on mine... but only when cruising on the motorway and you lift off... press the go pedal again and it stops. Even a light press on the accelerator will cancel it out.
Only a slight whine and no one would know unless they knew it shouldn't be there. Dealer diagnosis...? I will give it a try I guess.
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| Thu May 08 2008 8:43pm |
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NoDo$h
Joined: 02 May 2006
Location: Decapod 10
Posts: 5487
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Should get an update tomorrow lunchtime. If no joy at the dealer from the mechanical bits then I'll jack it and swap the wheels to see if it's the tyres Don't Panic! Everything will be fine.... inflation is only 2.5% 3.0% 3.3% and the flying pigs are carbon neutral
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| Thu May 08 2008 10:17pm |
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AndrewS
Tarquin of the Desert
Joined: 06 May 2005
Location: Earth
Posts: 5735
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AndrewS wrote:Rear passenger wheel bearing
 For use of a 4x4 site and driver training pm me
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| Thu May 08 2008 11:21pm |
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