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Engine Coolant Leaking
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Mikeyb
 


Member Since: 08 Nov 2016
Location: Maldon, Essex
Posts: 516

United Kingdom 2006 Discovery 3 TDV6 HSE Auto Tonga GreenDiscovery 3
Engine Coolant Leaking

Morning all, my D3 has sprung a leak! Whilst not pouring out, the coolant level drops out of the expansion tank on relatively short journeys.

With the engine cover removed, everything that I can see looks dry. Dropping the sump guard plate down, the front of engine and radiator etc. seem dry but there are lots of coolant drips at the rear of the engine. However I cannot see any obvious sources of the leakage.

Can anyone give me some tips please on what is likely to be leaking around there, common faults or otherwise? Not such a Disco Newbie now!
IID BT  
Post #236157410th Feb 2024 8:40 am
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GFE
 


Member Since: 11 Nov 2018
Location: Dorset
Posts: 119

United Kingdom 2013 Discovery 4 TDV6 HSE Auto Causeway GreyDiscovery 4

Have you checked the thermostat housing ? They sometimes get a fine crack along the join  
Post #236157810th Feb 2024 9:35 am
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Mikeyb
 


Member Since: 08 Nov 2016
Location: Maldon, Essex
Posts: 516

United Kingdom 2006 Discovery 3 TDV6 HSE Auto Tonga GreenDiscovery 3

Thanks, I've not stumbled across that yet, where is it located?

I've dried everything off, run the engine up to temperature several times and left standing, but odddly there is not sign of any leakage currently. this is depsite finding a good dose of coolant spray low down from back of engine and under gearbox sump when I took the under trays off yesterday.

Dampest concentration appears to be around the diff/left side chassis rail area, so possibly not leaking from the rear of engine as I had first thought. still cannot see any dampness coming down from above though. All hoses etc. in the vincinity appear dry Sad Not such a Disco Newbie now!
IID BT  
Post #236160610th Feb 2024 2:14 pm
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Pete K
 


Member Since: 15 Jan 2016
Location: GL
Posts: 10676

England 2005 Discovery 3 TDV6 HSE Auto Rimini RedDiscovery 3

well the EGR coolers are on the sides. So check those hose connections.

https://www.ebay.co.uk/itm/315119303792?ha...R7zjibeyYw

The common plastic part to fail is at the front of the engine, in the middle of the Vee. A meduim sized collant pipe and a small bleed point attact to it

https://www.ebay.co.uk/itm/373627520185?ha...BM4KWOt7Jj  
Post #236161010th Feb 2024 2:33 pm
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Mikeyb
 


Member Since: 08 Nov 2016
Location: Maldon, Essex
Posts: 516

United Kingdom 2006 Discovery 3 TDV6 HSE Auto Tonga GreenDiscovery 3

Thanks everyone, it very much looks like the water (thermostat?) housing in the vee is the culprit.

I found this thread very helpful

https://www.disco3.co.uk/forum/topic198950...p;start=15

New housing has arrived, but now struggling to push over new cooler o-ring, despite liberally applying olive oil!

As not a genuine part (cooler o-ring does not seem to available separately from LR, you have to buy the whole coooler!), I sourced one with close dimensions to those detailed in the thread linked above. This has a round profile and may not be compressing enough. The old one taken off (that I have subsequenltly misplaces, grrr! appeared to be of a squarer flat sided profile - but this may not have been an original?

Any thoughts or advice gratefully received! Not such a Disco Newbie now!
IID BT 

Last edited by Mikeyb on 16th Feb 2024 7:10 pm. Edited 1 time in total 
Post #236224016th Feb 2024 6:31 pm
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Pete K
 


Member Since: 15 Jan 2016
Location: GL
Posts: 10676

England 2005 Discovery 3 TDV6 HSE Auto Rimini RedDiscovery 3

Lubricate the o ring with silicon  
Post #236224116th Feb 2024 6:39 pm
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