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Radiator filler leaking grey gunk
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Bubblehead
 


Member Since: 01 Jun 2020
Location: Horndean
Posts: 214

United Kingdom 2005 Discovery 3 TDV6 HSE Auto Scotia GreyDiscovery 3
Radiator filler leaking grey gunk


Could anyone give some advice please.. just went to top up the screen wash and noticed some oil ish looking liquid around the top of the coolant reservoir. Went to open it slowly and a think grey liquid started to pour out.. any ideas please..
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 2005 Disco3 HSE Auto 😁  
Post #222449714th Apr 2021 11:10 am
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N5Fav
 


Member Since: 28 Jan 2021
Location: LEICESTER
Posts: 134

United Kingdom 2007 Discovery 3 TDV6 XS Auto Buckingham BlueDiscovery 3

Looks like engine oil and coolant mixing.
Oil cooler failed, or head gasket failed.
 1994 Defender 300tdi 110 commercial
2007 Disco 2.7 XS Buckingham Blue
1959 Standard 10 Coffe & Cream
1974 Vauxhall Magnum 1800 estate Olivine Starfire Green
1994 Renault 19 Cabrio
1995 Kawasaki GPz 1100 
 
Post #222450814th Apr 2021 11:50 am
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Bubblehead
 


Member Since: 01 Jun 2020
Location: Horndean
Posts: 214

United Kingdom 2005 Discovery 3 TDV6 HSE Auto Scotia GreyDiscovery 3

Thanks for the reply..
I’ve checked oil on dipstick, whilst I know this isn’t any sort of guarantee the oil on there is absolutely fine, so am leaning away from head gasket.
Had considered oil cooler,
Will try to look into that now, is that a big job to change?
Oddly, having just checked the black hose that comes off the reservoir and goes to the radiator, this still has clean coolant running from it..?
 2005 Disco3 HSE Auto 😁  
Post #222451014th Apr 2021 11:58 am
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Bubblehead
 


Member Since: 01 Jun 2020
Location: Horndean
Posts: 214

United Kingdom 2005 Discovery 3 TDV6 HSE Auto Scotia GreyDiscovery 3

Also, having auctioned all the gunk out of the reservoir, there is still clean (ish) coolant in the bottom..? Any ideas advice welcomed.
Thanks
 2005 Disco3 HSE Auto 😁  
Post #222451314th Apr 2021 12:19 pm
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aja4x4
 


Member Since: 14 Apr 2019
Location: Westbury
Posts: 2459

United Kingdom 2005 Discovery 3 TDV6 SE Auto Zambezi SilverDiscovery 3

It sounds like Your oil cooler is just starting to fail with only a small amount of oil leaking at the moment but it will get worse.
It's not too bad to repair if you can get the okl separator out
 Andrew

D3 2.7tdv6 2005
D4 3.0 SDV6 Commercial died and gone to LR heaven
D5 3.0 SDV6 HSE 
 
Post #222451514th Apr 2021 12:28 pm
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Bubblehead
 


Member Since: 01 Jun 2020
Location: Horndean
Posts: 214

United Kingdom 2005 Discovery 3 TDV6 HSE Auto Scotia GreyDiscovery 3

Thanks again!
What is the repair, is it a case of replacing as a unit the oil separator and cooler or are there parts that can be replaced in each?
 2005 Disco3 HSE Auto 😁  
Post #222452214th Apr 2021 1:17 pm
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aja4x4
 


Member Since: 14 Apr 2019
Location: Westbury
Posts: 2459

United Kingdom 2005 Discovery 3 TDV6 SE Auto Zambezi SilverDiscovery 3

Yes the oil cooler sits at the top of the engine under the oil filter, the oil separator sits behind it and has to be removed to get the oil cooler out.

If you use the search function theres a how to video on this site.
The oil separator is quite tall and is hard to wiggle out but you can cut a bit off the bottom that makes it easier to fit back in again.
If you watch the video it explains it all very well.
 Andrew

D3 2.7tdv6 2005
D4 3.0 SDV6 Commercial died and gone to LR heaven
D5 3.0 SDV6 HSE 
 
Post #222455414th Apr 2021 3:49 pm
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aja4x4
 


Member Since: 14 Apr 2019
Location: Westbury
Posts: 2459

United Kingdom 2005 Discovery 3 TDV6 SE Auto Zambezi SilverDiscovery 3

https://www.disco3.co.uk/forum/27td-engine...Oil+cooler
 Andrew

D3 2.7tdv6 2005
D4 3.0 SDV6 Commercial died and gone to LR heaven
D5 3.0 SDV6 HSE 
 
Post #222456214th Apr 2021 4:29 pm
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Bubblehead
 


Member Since: 01 Jun 2020
Location: Horndean
Posts: 214

United Kingdom 2005 Discovery 3 TDV6 HSE Auto Scotia GreyDiscovery 3

That’s fantastic thank you!!
I assume having not noticed the oily coolant, the first symptom would have been a rise in running temperature? I wonder how far off that would have been..
I’m going to get a couple of quotes from some garages as not entirely sure I can do it or have the time to do it myself. Looks to be a pretty in depth job..
 2005 Disco3 HSE Auto 😁  
Post #222456614th Apr 2021 4:38 pm
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aja4x4
 


Member Since: 14 Apr 2019
Location: Westbury
Posts: 2459

United Kingdom 2005 Discovery 3 TDV6 SE Auto Zambezi SilverDiscovery 3

I would get the garage to check it out properly first.
What normaly it gets worse and worse then you gave to not only have the oil cooler replaced you need to get the coolant bottle replaced and the engine cleaned out which can be a pain
 Andrew

D3 2.7tdv6 2005
D4 3.0 SDV6 Commercial died and gone to LR heaven
D5 3.0 SDV6 HSE 
 
Post #222456814th Apr 2021 4:42 pm
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Bubblehead
 


Member Since: 01 Jun 2020
Location: Horndean
Posts: 214

United Kingdom 2005 Discovery 3 TDV6 HSE Auto Scotia GreyDiscovery 3

So just had the diagnostic back from the garage, 100% the EGR cooler apparently.
How do these operate, pretty sure the EGR’s on mine have been blanked.. will this make any difference to the coolers? One for each side, is that correct?
 2005 Disco3 HSE Auto 😁  
Post #222515817th Apr 2021 4:20 pm
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gstuart
 


Member Since: 21 Oct 2016
Location: kent
Posts: 13576

United Kingdom 2005 Discovery 3 TDV6 Base 7 Seat Auto Java BlackDiscovery 3

That’s a better result and by the looks of it easier to blank the cooling side of the EGRs

Here’s a few links

https://www.disco3.co.uk/forum/egr-cooler-...Egr+cooler

From the workshop manual

https://onedrive.live.com/?authkey=%21AMrv...mp;o=OneUp

Hope it helps


Click image to enlarge
   
Post #222516317th Apr 2021 5:02 pm
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Motolab
 


Member Since: 18 Oct 2019
Location: Sleen
Posts: 1815

Netherlands 2006 Discovery 3 TDV6 HSE Auto Zambezi SilverDiscovery 3

Bubblehead wrote:
pretty sure the EGR’s on mine have been blanked.. will this make any difference to the coolers? One for each side, is that correct?


No, will make no difference for the coolers, as a “standard” EGR blanking is only a metal plate who avoids recirculating exhaust gasses towards the inlet manifold...

So the coolers themselves are still fully functional...

Imho if one is leaking cooling fluid, simply replace it with another non leaking one... because rerouting or blanking the cooling circuit, will be trigger (unexpected) unwanted sideceffects elsewere, like overheating ... and therefore potential risk for damage and fire
 Best regards
Harold

Always looking for Pre '55's & Pre war British Motorcycles! knowing or having one for sale? PM please. I visit the UK 6 times a year

Ps. I edit my texts quite often, english is not my native language, so I will edit My “typo’s” etc. Wink 
 
Post #222517517th Apr 2021 6:26 pm
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Bubblehead
 


Member Since: 01 Jun 2020
Location: Horndean
Posts: 214

United Kingdom 2005 Discovery 3 TDV6 HSE Auto Scotia GreyDiscovery 3

Thanks for the replies, makes sense ref causing other problems.
Looks like it will be a pair of replacements. Probably makes sense that if one is gone to change both at same time. ( other mat not be far behind..?)
 2005 Disco3 HSE Auto 😁  
Post #222518817th Apr 2021 7:26 pm
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Bubblehead
 


Member Since: 01 Jun 2020
Location: Horndean
Posts: 214

United Kingdom 2005 Discovery 3 TDV6 HSE Auto Scotia GreyDiscovery 3

Does anyone happen to know if there is anyway of determining if the problem will is EGR cooler or oil cooler without stripping down?
Reason i ask is the garage have said EGR coolers but are not sure which one so both need changing, which I absolutely agree with, but aside from that making it twice as expensive, it also makes me wonder if there is then any guarantee that it’s is actually the EGR cooler and not the oil cooler.
Any thoughts welcomed..
Thanks
 2005 Disco3 HSE Auto 😁  
Post #222552219th Apr 2021 1:30 pm
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