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Roaring noise while driving
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douglas67
 


Member Since: 24 May 2007
Location: Castle Douglas
Posts: 18

Scotland 2011 Discovery 4 3.0 TDV6 HSE Auto Stornoway GreyDiscovery 4
Roaring noise while driving

Both Dealer and myself struggling to identify a roaring noise while driving. I tow a lot and the noise is more audible while towing, i.e engine under load.
Definately coming from front end. Sounds like a small cc engine increasing in revs in the background even although engine revs are constant. more prominent going up hill ie under load.
It is a high pitch roar that increases in volume and then decreases in volume of its own accord.
If I hear the noise and press the clutch you can hear the engine die down and then the roar dies down about 1 second after.
Anyone any ideas? 

Last edited by douglas67 on 6th Jun 2008 11:14 pm. Edited 2 times in total 
Post #3074936th Jun 2008 10:57 pm
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Maverick
 


Member Since: 25 Jul 2007
Location: Lost on the misty mountain hop!
Posts: 2580

Scotland 

Welcome to the site!
Turbo? That would explain the whining down after a few seconds!
I'm probably wrong though! Ben

1996 Defender 90 300 TDi  
Post #3074956th Jun 2008 10:59 pm
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douglas67
 


Member Since: 24 May 2007
Location: Castle Douglas
Posts: 18

Scotland 2011 Discovery 4 3.0 TDV6 HSE Auto Stornoway GreyDiscovery 4

Had new turbo fitted 6000 miles ago. Would assume turbo would be a constant noise not rising and dying while engine at constant revs?  
Post #3074976th Jun 2008 11:04 pm
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10forcash
 


Member Since: 09 Jun 2005
Location: Ubique
Posts: 16534

United Kingdom 2007 Discovery 3 TDV6 HSE Manual Zermatt SilverDiscovery 3

Front diff or aux belt tensioner / engine cooling fan bearing
Mav. turbo's don't whine (unlike teenagers) they scream....  
Post #3074986th Jun 2008 11:05 pm
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Maverick
 


Member Since: 25 Jul 2007
Location: Lost on the misty mountain hop!
Posts: 2580

Scotland 

I said that I was probably wrong!

Also, are you suggesting that teenagers are unable to scream? Ben

1996 Defender 90 300 TDi  
Post #3074996th Jun 2008 11:07 pm
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10forcash
 


Member Since: 09 Jun 2005
Location: Ubique
Posts: 16534

United Kingdom 2007 Discovery 3 TDV6 HSE Manual Zermatt SilverDiscovery 3

No, i've made a few scream in my time - wanna be next? Mr. Green  
Post #3075016th Jun 2008 11:08 pm
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douglas67
 


Member Since: 24 May 2007
Location: Castle Douglas
Posts: 18

Scotland 2011 Discovery 4 3.0 TDV6 HSE Auto Stornoway GreyDiscovery 4

Guys have just edited my post. It is more of a roar than a whine. Also had new rear diff fitted 2000 miles ago.  
Post #3075026th Jun 2008 11:10 pm
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Maverick
 


Member Since: 25 Jul 2007
Location: Lost on the misty mountain hop!
Posts: 2580

Scotland 

Now, there are two ways you could do that and I'm certain I don't want either! Ben

1996 Defender 90 300 TDi  
Post #3075036th Jun 2008 11:11 pm
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CG
 


Member Since: 12 Nov 2007
Location: In the middle somewhere
Posts: 3745

England 2006 Discovery 3 TDV6 S Manual Zermatt SilverDiscovery 3

My first D2 has a viscous fan that used to semi seize now and then, this gave a delayed roaring noise. 
"I know that you believe that you understood what you think I said, but I am not sure you realize that what you read is not what I meant"  
Post #3075046th Jun 2008 11:12 pm
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Gareth
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Member Since: 07 Dec 2004
Location: Bramhall
Posts: 26774

United Kingdom 

Cooling fan doing overtime?  
Post #3075056th Jun 2008 11:13 pm
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10forcash
 


Member Since: 09 Jun 2005
Location: Ubique
Posts: 16534

United Kingdom 2007 Discovery 3 TDV6 HSE Manual Zermatt SilverDiscovery 3

If it's a 'roar' then it sounds like the engine cooling fan is working NORMALLY it is not a viscous fan but an electronically controlled fan with a clutch controlled by a PWM signal dependent upon various engine temperature readings  
Post #3075066th Jun 2008 11:13 pm
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douglas67
 


Member Since: 24 May 2007
Location: Castle Douglas
Posts: 18

Scotland 2011 Discovery 4 3.0 TDV6 HSE Auto Stornoway GreyDiscovery 4

Thanks guys. Goodnight  
Post #3075146th Jun 2008 11:24 pm
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10forcash
 


Member Since: 09 Jun 2005
Location: Ubique
Posts: 16534

United Kingdom 2007 Discovery 3 TDV6 HSE Manual Zermatt SilverDiscovery 3

is that it? no wit and repartee?
Jeez, you'd think that some people come on here just to talk themselves to sleep! Thud

















Wink  
Post #3075186th Jun 2008 11:27 pm
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DG
Site Moderator 


Member Since: 12 Dec 2005
Location: The Gaff
Posts: 50978

Wales 

Was this fan on a 90 or a 110 Confused Whistle 21 year LR veteran > D2 GS 2003 > D3 S 2006 > D3 HSE 2009 > D4 HSE 2013 > D4 HSE 2015 > D5 HSE 2018 > DS HSE R-Dynamic P300e 2021  
Post #3075226th Jun 2008 11:30 pm
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CG
 


Member Since: 12 Nov 2007
Location: In the middle somewhere
Posts: 3745

England 2006 Discovery 3 TDV6 S Manual Zermatt SilverDiscovery 3

A D3 I presume ? 
"I know that you believe that you understood what you think I said, but I am not sure you realize that what you read is not what I meant"  
Post #3075236th Jun 2008 11:32 pm
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