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Oil cooler or more serious?
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IanMellor
 


Member Since: 22 Aug 2013
Location: Dublin
Posts: 145

Ireland 2005 Discovery 3 TDV6 HSE Auto Adriatic BlueDiscovery 3
Oil cooler or more serious?

Its been a good few months since my disco (TDV6 2.7) started having trouble.
It started with a pinhole leak in the cooling system, which my mechanic fixed.
When I got it back it was fine for 5 minutes but when it heat up it would suddenly blow all the coolant out of the plastic expansion tank!
My mechanical suspected it was a blown head but I was skeptical as there was no steam out the exhaust and took time to happen.
Now there is oil (this wasn't the case initially) inside the plastic expansion tank.
There is no emulation when I dip the oil.

I set it to my local indi, he suspects that it could be the oil cooler and has suggested changing both it and the radiator, but there is no guarantee and it could be money down the drain.

Could he be right, has anyone seen this oil cooler fault before?
  
Post #20513517th May 2019 11:00 am
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defector
 


Member Since: 23 Feb 2009
Location: Greater Manchester
Posts: 1419

United Kingdom 2008 Discovery 3 TDV6 HSE Auto Zermatt SilverDiscovery 3

Happens a fair bit on modern cars as the oil cooler leaks internally.
Change oil cooler and run run engine with washing up detergent added to the water ( I have used Surf before but I tho k you can now buy a specific cleaner for this). May need 2 or 3 flushes but has worked for me without need to change radiator.
  
Post #20513597th May 2019 11:14 am
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Pete K
 


Member Since: 15 Jan 2016
Location: GL
Posts: 10336

England 2005 Discovery 3 TDV6 HSE Auto Rimini RedDiscovery 3

The oil/water cooler is in the middle of the engine on these.
  
Post #20513647th May 2019 11:30 am
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IanMellor
 


Member Since: 22 Aug 2013
Location: Dublin
Posts: 145

Ireland 2005 Discovery 3 TDV6 HSE Auto Adriatic BlueDiscovery 3

Could an oil cooler leak be enough to force coolant out?
  
Post #20513657th May 2019 11:34 am
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Rnclayton
 


Member Since: 13 Apr 2018
Location: Radstock, Bath
Posts: 564

Wales 2006 Discovery 3 TDV6 HSE Auto Santorini BlackDiscovery 3

Had the oil cooler fail on my Freel2.

It regularly threw the coolant out of the expansion vessel, while I was trying to work out what the problem was. Oil in the water being the obvious sign.
 MY07 Freelander2 SE Santorini Black - Gone
MY10 D4 XS Buckingham Blue
MY06 D3 HSE 
 
Post #20513717th May 2019 11:47 am
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MikeBob
 


Member Since: 19 Sep 2016
Location: Pretoria
Posts: 105

South Africa 2010 Discovery 4 3.0 TDV6 SE Auto Ipanema SandDiscovery 4

It could also just be the gasket between oil cooler and block. Check it before purchasing a new cooler
  
Post #20514207th May 2019 5:21 pm
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IanMellor
 


Member Since: 22 Aug 2013
Location: Dublin
Posts: 145

Ireland 2005 Discovery 3 TDV6 HSE Auto Adriatic BlueDiscovery 3

Would an exhaust gas detection help determine if the pressure comes from the oil cooler?
  
Post #20515048th May 2019 6:53 am
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Lee j
 


Member Since: 08 Dec 2019
Location: Lechlade
Posts: 6

United Kingdom 2007 Discovery 3 TDV6 HSE Auto Unknown ColourDiscovery 3

Does anyone have any info or tips on removing the oil cooler I can't seem to find anything anywhere. I have oil in my expansion tank and the garage thinks it's the cooler.
  
Post #218046216th Oct 2020 10:47 am
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PROFSR G
 


Member Since: 06 Mar 2017
Location: Lost
Posts: 4580

Ukraine 2009 Discovery 3 TDV6 Commercial XS Auto Stornoway GreyDiscovery 3

Drain the cooling system and disconnect the battery earth. Remove the water outlet and hoses at the front of the engine. Remove the oil cooler bolts (I think there's about 8 or 10 of them) and remove the oil cooler.

Replace the 0 ring seal and gasket with new, reassembly is reverse of removal but replace too the 0 ring seals on the water outlet as well. Can't remember if the L/H knock sensor has to come out but I think it probably does. Thumbs Up
 yµ (idµ - eAµ) ψ=mψ

 
 
Post #218046816th Oct 2020 11:49 am
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Lee j
 


Member Since: 08 Dec 2019
Location: Lechlade
Posts: 6

United Kingdom 2007 Discovery 3 TDV6 HSE Auto Unknown ColourDiscovery 3

Thanks very much Thumbs Up
  
Post #218047116th Oct 2020 12:10 pm
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PROFSR G
 


Member Since: 06 Mar 2017
Location: Lost
Posts: 4580

Ukraine 2009 Discovery 3 TDV6 Commercial XS Auto Stornoway GreyDiscovery 3

I just remembered, the crankcase breather has to come out as well. Embarassed It's a bit of a pig to prise out!
Wash it out with kerosene or similar and then hot soapy water, then allow to dry thoroughly before refitting.
 yµ (idµ - eAµ) ψ=mψ

 
 
Post #218047216th Oct 2020 12:17 pm
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