 | Home > Wheels & Tyres > Beware of aluminium tyre valve covers! |
 
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| DonH2000 Member Since: 12 Jan 2015 Location: North Kent Posts: 551   
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No 1 daughter bought me for Christmas some nice looking Land Rover tyre valve covers. Tried to undo them to check the tyre pressures over the weekend and two of them had welded themselves onto the valves (the valves turned as I tried to use a 10mm spanner on them). Cost me £10 per wheel to get the valves changed!
Be warned and regularly lubricate them. I am back with plastic ones now!!  Click image to enlarge Cheers Don. |
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9th May 2018 10:31am |
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| DonH2000 Member Since: 12 Jan 2015 Location: North Kent Posts: 551
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Mine had a fine white alumininium powder on them and when I used the dremmel to cut the ends off to get access to the valve I still could not undo them as they had corroded on to the thread. Cheers Don.
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9th May 2018 10:38am |
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| X4SKP Member Since: 29 Nov 2013 Location: Berkshire Posts: 2295 
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Yes known problem (often the hard way...
 ) dissimilar metals initially in dry close contact + water = corrosion
Copper Slip will prevent this... Click image to enlarge SKIP https://www.defender2.net/forum/topic83242.html |
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9th May 2018 11:26am |
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| Bluest Member Since: 23 Apr 2016 Location: Lancashire Posts: 4206 
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My last car had metal valve caps from new and they were always getting seized. I was reluctant to put any sort of grease on there as I didn’t want to any to get in the valve stem and cause a leak. Bog standard plastic is the way to go.
Incidentally, did you know that the valve cap is the primary means of sealing the air in? The valve is really only there to stop the air rushing out before you put the cap back on. I definitely read that somewhere, but don’t ask me to give a reference! It always bugs me when I see cars with valve caps missing since I read that. 2007 110 TDCi Station Wagon XS |
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9th May 2018 11:41am |
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| custom90 Member Since: 21 Jan 2010 Location: South West, England. Posts: 20318
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^^^^ Very true. I have these ones now and they do have sealing washers in.
And it is indeed dusinikarmstaks issue. Vale stems seem like brass? When it comes to a little grease your only talking 1/4 the size of a pea amount iff that. Also tyre pressures I check regularity so they won’t be much chance to corrode. I think the larger ones are worst because they are easily over tightened more. Each to their own but I’d rather have them over plastic, and definitely not go without! ⭐️⭐️God Bless the USA 🇬🇧🇺🇸 ⭐️⭐️ |
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9th May 2018 1:00pm |
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| discomog Member Since: 09 May 2015 Location: Notts/Lincs Border Posts: 2526
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I'm afraid I must disagree, the valve cap is not the primary seal but is only a seal against ingress of dirt and dust. The primary seal is between the conical surface of the valve stem and seat. Some valve caps do have a synthetic rubber seal which helps prevent leakage which has already past the valve core but the prime reason for the rubber insert in the cap is to help prevent the dust cap coming loose. Defender 90XS SW
Mini Countryman Cooper S Morgan Plus 8 |
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9th May 2018 1:07pm |
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| custom90 Member Since: 21 Jan 2010 Location: South West, England. Posts: 20318
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Dissimilar metals issue* Apologies for the typo. On my phone. 🙄 ⭐️⭐️God Bless the USA 🇬🇧🇺🇸 ⭐️⭐️
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9th May 2018 1:09pm |
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| Doc P Member Since: 03 Apr 2016 Location: Midlands Posts: 565 
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dusinikarmstaks😂
The most random auto complete I’ve seen since I wished my mate a ‘Happy Birmingham’. |
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9th May 2018 7:26pm |
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| VeeTee Member Since: 06 Mar 2011 Location: Somewhere Posts: 1512 
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^^^ Not so random as you would think... every mistaken character sits next to the one on the keyboard that was ment to be pressed... so merely a case of thick fingers (or too small keys on the keyboard)...
 Cheers, Vincent
1959 Polynorm 1/4 Ton Trailer, Olive Drab Green (sold) 1970 M416 Military Trailer (Camping Trailer Conversion), Epsom Green (sold) 1975 Series III 88 V6, Light Green (sadly sold) 1996 Defender 110 CSW 300 Tdi, Epsom Green (sold) 2000 Freelander 1 TD4 3-drs, Silver (sold) 2006 Freelander 1 TD4 5-drs Facelift Automatic, Tonga Green (sold) MySite |
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9th May 2018 7:49pm |
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| custom90 Member Since: 21 Jan 2010 Location: South West, England. Posts: 20318
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Small iPhone.
Next time go larger I think! ⭐️⭐️God Bless the USA 🇬🇧🇺🇸 ⭐️⭐️ |
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9th May 2018 8:05pm |
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| ericvv Member Since: 02 Jun 2011 Location: Near the Jet d'Eau Posts: 5816  
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If you want to stand out of the crowds, get your tires filled with nitrogen, then you can put the telltale green plastic dust caps. Pretty special and won’t weld onto the valves. Did that with previous cars, but with the volume of nitrogen needed to fill Defender tires I don’t think I want to know what my tire shop would charge for that.
Eric You never actually own a Defender. You merely look after it for the next generation. http://youtu.be/yVRlSsJwD0o https://youtu.be/vmPr3oTHndg https://www.youtube.com/watch?v=_GtzTT9Pdl0 https://www.youtube.com/watch?v=ABqKPz28e6A https://www.youtube.com/watch?v=rLZ49Jce_n0 https://www.youtube.com/watch?v=XvAsz_ilQYU https://www.youtube.com/watch?v=K8tMHiX9lSw https://m.youtube.com/watch?v=dxwjPuHIV7I https://vimeo.com/201482507 https://www.youtube.com/watch?v=ZSixqL0iyHw |
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9th May 2018 8:13pm |
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| Bluest Member Since: 23 Apr 2016 Location: Lancashire Posts: 4206
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I've had great success inflating with a blend of 78% Nitrogen and 21% Oxygen with a few other choice ingredients making up the remaining 1%
2007 110 TDCi Station Wagon XS |
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9th May 2018 8:21pm |
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| VeeTee Member Since: 06 Mar 2011 Location: Somewhere Posts: 1512
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Only +20%, as ordinary air constists of 80% nitrogen...
 Cheers, Vincent
1959 Polynorm 1/4 Ton Trailer, Olive Drab Green (sold) 1970 M416 Military Trailer (Camping Trailer Conversion), Epsom Green (sold) 1975 Series III 88 V6, Light Green (sadly sold) 1996 Defender 110 CSW 300 Tdi, Epsom Green (sold) 2000 Freelander 1 TD4 3-drs, Silver (sold) 2006 Freelander 1 TD4 5-drs Facelift Automatic, Tonga Green (sold) MySite |
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9th May 2018 8:22pm |
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| custom90 Member Since: 21 Jan 2010 Location: South West, England. Posts: 20318
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You're telling me Eric, a few weeks ago I installed Dynabeads which needed tyre's completely deflating then re-inflating. Admittedly I've only got a cheapy compressor, but took ages and there is a huge amount of air in them. Even more so with the 255's I have and wider. It's no wonder they have such warnings on them (the tyre walls) about never over pressure setting beads etc. I am pretty sure they would do you serious harm should one explode and being in the vicinity. And that is probably putting it lightly too! ⭐️⭐️God Bless the USA 🇬🇧🇺🇸 ⭐️⭐️ |
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9th May 2018 8:30pm |
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