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Timing belt idlers
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RobLR
 


Member Since: 19 Nov 2016
Location: Scottish Borders
Posts: 79

United Kingdom 2012 Discovery 4 3.0 SDV6 XS Auto Orkney GreyDiscovery 4
Timing belt idlers

Hi, had front timing belt done on D4 including tensioner and bolts, however was advised that existing idlers were in good shape.

How long do idlers last and any reason for worry at all?

If idler was to fail what can happen?

Thanks
  
Post #191438513th Feb 2018 9:12 pm
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Flack
 


Member Since: 06 Sep 2006
Location: Preston Lancashire
Posts: 6224

England 2007 Discovery 3 TDV6 XS Auto Stornoway GreyDiscovery 3

If they fail its a new engine, I will never change any front belts on a D3 or D4 without fitting new idler pulleys. around £80.00 for the pair against 5 to 6 k for new engine.

Flack Thumbs Up
  
Post #191439413th Feb 2018 9:26 pm
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IOM man
 


Member Since: 03 Nov 2013
Location: Peel
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Isle Of Man 2010 Discovery 4 3.0 TDV6 HSE Auto Nara BronzeDiscovery 4

I was informed that my idlers were in good shape, but after 6k I started to hear a ticking noise that was caused by slight play in one idler that made the belt shift over on the RH camshaft pulley causing the belt to rub and split, the bit of belt sticking out was hitting the plastic cover causing the tick, luckily I caught it in time



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Post #191439613th Feb 2018 9:28 pm
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dgardel
 


Member Since: 03 Nov 2009
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Italy 2014 Discovery 4 3.0 SDV6 XXV LE Auto Santorini BlackDiscovery 4

ALWAYS CHANGE THE IDLER PULLEYS ALWAYS

If a pulley stops/stuks, the belt breaks ...

Your imagination can hypothesize what happens then .....
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Post #191439713th Feb 2018 9:28 pm
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Disco_Mikey
 


Member Since: 29 May 2007
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Scotland 2005 Discovery 3 TDV6 HSE Auto Cairns BlueDiscovery 3

Flack wrote:
If they fail its a new engine, I will never change any front belts on a D3 or D4 without fitting new idler pulleys. around £80.00 for the pair against 5 to 6 k for new engine.

Flack Thumbs Up


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Post #191440013th Feb 2018 9:32 pm
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robpenrose
 


Member Since: 12 Jan 2016
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United Kingdom 2010 Discovery 4 3.0 TDV6 HSE Auto Stornoway GreyDiscovery 4

My idlers were changed when mine was recently done. The garage suggested it as essential. There logic was the belts might not get touched again for another 7 years or 100k+ mileage, by which point, the originals will be very old and possibly very worn.
 

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Post #191440313th Feb 2018 9:39 pm
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Jubbly
 


Member Since: 20 Nov 2016
Location: Stourbridge
Posts: 401

United Kingdom 

Disco_Mikey wrote:
Flack wrote:
If they fail its a new engine, I will never change any front belts on a D3 or D4 without fitting new idler pulleys. around £80.00 for the pair against 5 to 6 k for new engine.

Flack Thumbs Up


This Thumbs Up


Agree wouldn't change belts without doing tensioners etc.
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Post #191440913th Feb 2018 9:53 pm
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Languedoc
 


Member Since: 29 Jul 2017
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France 2006 Discovery 3 TDV6 S Auto Cairns BlueDiscovery 3

Would anyone know if that part number for the idler mentioned is the actual pulley? Says 2 of them so assume it is.
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Post #191442013th Feb 2018 10:43 pm
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ROY_H
 


Member Since: 30 Jun 2014
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England 2011 Discovery 4 3.0 SDV6 HSE Auto Stornoway GreyDiscovery 4

robpenrose wrote:
My idlers were changed when mine was recently done. The garage suggested it as essential. There logic was the belts might not get touched again for another 7 years or 100k+ mileage, by which point, the originals will be very old and possibly very worn.


Very sound advice Thumbs Up

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Post #191454714th Feb 2018 1:45 pm
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DN
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Last edited by DN on 19th Apr 2018 7:52 pm. Edited 1 time in total 
Post #191455114th Feb 2018 1:58 pm
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SteveNorman
 


Member Since: 14 Oct 2005
Location: Somerset
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United Kingdom 

Quote:
Mikey:If they fail its a new engine, I will never change any front belts on a D3 or D4 without fitting new idler pulleys. around £80.00 for the pair against 5 to 6 k for new engine.

Flack Thumbs Up



Yep no brainier really.

Cheers
Steve
  
Post #191465614th Feb 2018 7:52 pm
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