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DISCO3.CO.UK > Maintenance & Mods (D3)

TDV6 valve cover oil leak rear left and right corner
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Discovery3Swiss
 


Member Since: 26 Mar 2023
Location: Zofingen
Posts: 4

Switzerland 2009 Discovery 3 TDV6 HSE Auto Santorini BlackDiscovery 3
TDV6 valve cover oil leak rear left and right corner

Hello

I've been restoring a Discovery 3 for six months now and would like to travel through Europe in it over the next few years. I've been struggling with two gruelling oil leaks for two days now, after replacing both valve cover seals in April. The only leaks are in the two corners at the rear left and right and only between the cylinder head and gasket. I have already tried tightening and loosening it and it has not brought any improvement. Have any of you already had the same problem or do you have a tip on how to solve this problem without dismantling the whole valve cover (and the thousand parts before)?

View from below of the oil leak at the rear right:

Click image to enlarge


Best regards
Valentin  
Post #237609028th Aug 2024 3:48 pm
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Pete K
 


Member Since: 15 Jan 2016
Location: GL
Posts: 10732

England 2005 Discovery 3 TDV6 HSE Auto Rimini RedDiscovery 3

I think it must need some sealant on the valve cover at the rear.  
Post #237610628th Aug 2024 6:33 pm
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Discovery3Swiss
 


Member Since: 26 Mar 2023
Location: Zofingen
Posts: 4

Switzerland 2009 Discovery 3 TDV6 HSE Auto Santorini BlackDiscovery 3

Hello Pete

You mean sealing the corners of the half-moons with some sealant? I did that when I replaced the valve cover gasket. With the help of a mirror I could see that the oil was not coming from the half-moons.

I tried again today to seal the leaks by loosening and gently tightening the screws in the corners, unfortunately without success.

Perhaps I will have to remove the valve covers with all the necessary preparatory work and refit them...  
Post #237611128th Aug 2024 7:41 pm
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loanrangie
 


Member Since: 18 Jun 2017
Location: Melbourne
Posts: 705

Australia 2008 Discovery 3 TDV6 SE Auto Stornoway GreyDiscovery 3

Pete K wrote:
I think it must need some sealant on the valve cover at the rear.


Correct, the manual specifies using sealant in the corners of the valve covers near the camshaft caps.  
Post #237618530th Aug 2024 3:45 am
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Globetrotter448
 


Member Since: 21 Mar 2017
Location: Londonderry NSW
Posts: 1822

Australia 2007 Discovery 3 4.0 V6 Petrol SE Auto Java BlackDiscovery 3

The secret to Valve cover oil leaks is to use a Cork gasket and not tighten it too much.  
Post #23766035th Sep 2024 10:32 am
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Pete K
 


Member Since: 15 Jan 2016
Location: GL
Posts: 10732

England 2005 Discovery 3 TDV6 HSE Auto Rimini RedDiscovery 3

didn't know they did cork ones.

I would have thought there would be too many shapes and curves for cork  
Post #23766065th Sep 2024 11:04 am
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loanrangie
 


Member Since: 18 Jun 2017
Location: Melbourne
Posts: 705

Australia 2008 Discovery 3 TDV6 SE Auto Stornoway GreyDiscovery 3

Globetrotter448 wrote:
The secret to Valve cover oil leaks is to use a Cork gasket and not tighten it too much.


Its not 1970, no one uses cork gaskets anymore.  
Post #23766085th Sep 2024 11:31 am
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