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Coolant bleed screw
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Lee Trinder
 


Member Since: 12 Aug 2018
Location: Henley in arden
Posts: 516

2007 Discovery 3 TDV6 HSE Auto Stornoway GreyDiscovery 3
Coolant bleed screw

Hi, anyone had the the bleed screw on the expansion tank come loose? Ours was showing low coolant the other day so I had a look under the bonnet gave it slight tweak and it blew off, the engine was hot by the way. It wouldn’t thread back in properly, I wound some ptfe tape round and all was good, until today when it blew off just as my wife pulled onto the drive. Is this a common fault?  
Post #204020425th Mar 2019 7:34 pm
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PROFSR G
 


Member Since: 06 Mar 2017
Location: Lost
Posts: 5180

Ukraine 2009 Discovery 3 TDV6 Commercial XS Auto Stornoway GreyDiscovery 3

Not come across it as an issue before, might be someone previously damaged the threads Rolling Eyes yµ (idµ - eAµ) ψ=mψ

  
Post #204021125th Mar 2019 8:05 pm
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Lee Trinder
 


Member Since: 12 Aug 2018
Location: Henley in arden
Posts: 516

2007 Discovery 3 TDV6 HSE Auto Stornoway GreyDiscovery 3

Hi, seems to be a very short thread on bleed screw.  
Post #204021325th Mar 2019 8:11 pm
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Pete K
 


Member Since: 15 Jan 2016
Location: GL
Posts: 10849

England 2005 Discovery 3 TDV6 HSE Auto Rimini RedDiscovery 3

New tanks are £25  
Post #204021825th Mar 2019 8:26 pm
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Lee Trinder
 


Member Since: 12 Aug 2018
Location: Henley in arden
Posts: 516

2007 Discovery 3 TDV6 HSE Auto Stornoway GreyDiscovery 3

One on order, cheers  
Post #204022425th Mar 2019 8:57 pm
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cobby
 


Member Since: 05 Aug 2018
Location: Oxfordshire
Posts: 230

United Kingdom 2007 Discovery 3 TDV6 GS Auto Java BlackDiscovery 3

I run mine with the radiator cap loose and it causes no issues as I do with my other vehicles.
I think 15psi in the cooling system puts too much stress on seals hoses etc.
I know it's designed for it and the idea behind pressurising the system is to raise the boiling point and allow the use of smaller radiators.
As I said I've run my D3 like it for 8 years not even having to top it up.
Jim. Thumbs Up  
Post #204036326th Mar 2019 9:34 am
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L319
 


Member Since: 14 Dec 2013
Location: Herefordshire
Posts: 2084

United Kingdom 2005 Discovery 3 TDV6 HSE Auto Buckingham BlueDiscovery 3

I had my bleed screw leaking and as the ambient air temp. was 39C, I decided not to tighten as I was concerned as its plastic it would strip or shear off. Very early ones didn't have a seal so it was changed to the later version with one.  
Post #204042826th Mar 2019 1:14 pm
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pigeon_voyageur
 


Member Since: 30 Dec 2018
Location: Le Cheylas
Posts: 107

France 2005 Discovery 3 TDV6 SE Auto Bonatti GreyDiscovery 3

Hi there,

I know it is an old post.
My coolant bleed screw is very worn. I would like to change only the screw and not the whole tank.

Still, I can not find the ref. for this screw.
I have a '2005 2.7L TDV6 Disco 3.

Does anyone have the reference for this screw ???

Thanks for your help, Bonatti Grey D3 TDV6 for holidays use,

Zambezi Silver D3 TDV6 7 seater (parts for sale)
RR L322 3.6 TDV8 : everyday car
Series 3 pickup : ongoing project (chassis corroded + leaks + paint)  
Post #238785417th Feb 2025 8:25 pm
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kajtzu
 


Member Since: 10 Aug 2017
Location: Helsinki
Posts: 6806

Finland 2005 Discovery 3 4.4 V8 HSE Auto Cairns BlueDiscovery 3

LR007314 in principle which is superseded by LR055301.

Difficult to say if the threads are the same on an original (?) tank, however. See https://lrcat.com/#!/12128/41216/42091/3277/42488.

I would change the whole tank, really, if your float is original too. Thumbs Up  
Post #238785717th Feb 2025 9:06 pm
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pigeon_voyageur
 


Member Since: 30 Dec 2018
Location: Le Cheylas
Posts: 107

France 2005 Discovery 3 TDV6 SE Auto Bonatti GreyDiscovery 3

Thanks Kajtzu,

I also have a '2007 L322 3.6 TDV8 at home.
The L322 has a LR007314/LR055301 bleed screw (as mentionned in LRCat).

Still, it is not the same screw as in the '2005 2.7L TDV6 Disco 3.

I tried at Land Rover, they also told me to change the whole expansion tank.

I must admit that I am not keen on changing a whole tank for 150€ when only a bleed screw at 5€ is worn... To me, it is a waste of money and natural ressources.

I mesured that screw.


Click image to enlarge



I will carry on searching. Thanks for your help, Bonatti Grey D3 TDV6 for holidays use,

Zambezi Silver D3 TDV6 7 seater (parts for sale)
RR L322 3.6 TDV8 : everyday car
Series 3 pickup : ongoing project (chassis corroded + leaks + paint)  
Post #238786918th Feb 2025 6:50 am
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kajtzu
 


Member Since: 10 Aug 2017
Location: Helsinki
Posts: 6806

Finland 2005 Discovery 3 4.4 V8 HSE Auto Cairns BlueDiscovery 3

You could get a Febi tank for about 64 euro or a Ridex one for 44 euro. Both inclusive TVA from auto-doc.

I have a Nissens which cost 80 but I mean how badly can one screw up a plastic tank, a sensor, cap and a screw? (Ridex is autodoc’s own brand)  
Post #238787918th Feb 2025 10:50 am
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pigeon_voyageur
 


Member Since: 30 Dec 2018
Location: Le Cheylas
Posts: 107

France 2005 Discovery 3 TDV6 SE Auto Bonatti GreyDiscovery 3

Ok. Thanks for the advice.
I purchased a new expansion tank.

I choose a Meyle: 62€ with the cap, delivered. Bonatti Grey D3 TDV6 for holidays use,

Zambezi Silver D3 TDV6 7 seater (parts for sale)
RR L322 3.6 TDV8 : everyday car
Series 3 pickup : ongoing project (chassis corroded + leaks + paint)  
Post #238789918th Feb 2025 7:08 pm
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