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nivekau
Member Since: 19 Apr 2012
Location: Melbourne, Victoria
Posts: 85
  
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| How to troubleshoot noisy bearing at front of engine? |
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I've got what sounds like a noisy bearing on an ancillary component/idler at the front of my engine.
It's only noisy when the car is started from cold and goes away after about 60-90 seconds of running. The noise is there regardless of whether the AC turned on or off, and the noise changes with engine speed.
Can anyone suggest a way to identify where it is coming from? 2007 Land Rover LR3 4.0L V6
Other current other cars
2022 BMW X3 xDrive 30i
2000 Mercedes ML430 (enjoying the challenge of keeping it going!)
1973 Bristol 411 S5
If you are interested in Bristols (the cars), click on my WWW button below...
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 13th Sep 2021 6:44 am |
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lynalldiscovery
Member Since: 22 Dec 2009
Location: Maidstone
Posts: 7274
 
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Pop belt off and have a spin of the pulleys.
I have no idea what engine you have? but if it is the 2.7 be aware the a/c never truly switches off even when switched off the pump is still working, have a serahc for variable displacement a/c pumps.
I hope for your sake it is not the a/c pump on a 2.7, as it is one ahole of a job!
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| 13th Sep 2021 12:25 pm |
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cfcjim
Member Since: 22 Jun 2010
Location: Munich
Posts: 65
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Is it possibly your tensioner? They go on the TDV6 and make quite a noise.
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| 14th Sep 2021 7:39 am |
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aja4x4
Member Since: 14 Apr 2019
Location: Westbury
Posts: 2459
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I would start by replacing the aux belt and both tensioners, its most likely one of them making the noise and its easy to do. Andrew
D3 2.7tdv6 2005
D4 3.0 SDV6 Commercial died and gone to LR heaven
D5 3.0 SDV6 HSE
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| 14th Sep 2021 8:16 am |
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nivekau
Member Since: 19 Apr 2012
Location: Melbourne, Victoria
Posts: 85
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Thanks for the suggestions. I should have mentioned, my car has the 4L V6 petrol engine (I'm in Australia).
Haven't had time to investigate further yet. I have however determined that it appears to be temperature sensitive. The noise is usually there first thing in the morning when the car is cold (it's Spring here and we've been having single figure overnight temps), however yesterday morning the car had not been driven but had been sitting in the sun for a couple of hours - it was probably the warmest morning we'd had for a couple of months. When I started it, no noise! 2007 Land Rover LR3 4.0L V6
Other current other cars
2022 BMW X3 xDrive 30i
2000 Mercedes ML430 (enjoying the challenge of keeping it going!)
1973 Bristol 411 S5
If you are interested in Bristols (the cars), click on my WWW button below...
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| 17th Sep 2021 3:18 pm |
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Globetrotter448
Member Since: 21 Mar 2017
Location: Londonderry NSW
Posts: 1782
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could be timing chain and noise disappears after oil pressure is up. Check oil level and is it due for a change.
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| 27th Sep 2021 8:28 am |
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Trailered Movements
Member Since: 16 Jan 2020
Location: East/West Sussex Coast Borders
Posts: 1198
 
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Use a listening stick, a long BBQ fork is good.
One end on the relevant bearing, the other in your ear (best be the pointy bit on the bearing!), if you've never done it before, you'll be amazed at what you can hear.
Dave 2011 Discovery 4 Commercial SDV6 (Gone)
2010 RRS TDV8 (Gone)
1980 OBLIC 4.0ltr Range Rover (went a long time ago)
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| 27th Sep 2021 10:16 am |
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