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  #1  
Old 02-24-2014, 02:51 PM
Governa's Avatar
W123 240D
 
Join Date: Sep 2013
Location: Oporto, Portugal
Posts: 3
Question Having trouble inflating tyres after exchanging plastic valves for metal ones

I'm having trouble inflating the tyres of my W123 240D.

I have recently asked MB to replace the old ugly rubber/plastic valves for some metal ones (part number 1074000013).

But a couple of days ago when I went to my local BP petrol station I couldn't for the life of me properly fit the air pump to the valve so instead of inflating the tyres I was deflating them.

I actually had to go to MB where they had no trouble inflating them. They couldn't explain to me why it happened but their theory is that petrol station air pumps are a jack of all trades made to fit everything from bike to truck valves while the one they use is specifically made for regular cars.

So my question is did this happen to anyone? Should I revert back to the standard rubber valves? I really like the way these metal ones look on my Bundts so maybe I should just buy an air compressor and inflate them at home when needed?




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Old 02-24-2014, 06:21 PM
Governa's Avatar
W123 240D
 
Join Date: Sep 2013
Location: Oporto, Portugal
Posts: 3
Ok so moments ago I got the answer from a Portuguese cab driver on what exactly is going on. I'll try to describe it the best I can using my limited technical vocabulary.

Apparently these valves are too short so what's happening is that the pin inside the air pump nozzle hits the edge/rim of the valve before getting deep enough to perfectly seal around the valve and inflate the tyres without air escaping.

Mistery solved.

The next step will be to buy a portable yet sturdy air compressor that screws to the valve. Hopefully that will do it and last a lifetime.
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  #3  
Old 02-24-2014, 06:55 PM
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Join Date: Sep 2013
Location: Alhambra California
Posts: 3,129
I recently installed the same metal valve stems on the Bundt wheels of my 300CD. The tire shop had no problem inflating the tires. I assume that European air hoses and American air hoses use the same design, but who knows?
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Old 02-25-2014, 11:18 AM
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Join Date: Aug 2004
Location: Southold, NY
Posts: 291
Those are very attractive valves and they even have a little three-pointed star logo. Nice find.
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  #5  
Old 02-26-2014, 08:22 PM
Governa's Avatar
W123 240D
 
Join Date: Sep 2013
Location: Oporto, Portugal
Posts: 3
Having trouble inflating tyres after exchanging plastic valves for metal ones

Ok so I have just placed an order for a Ring RAC900 air compressor on Amazon.

I have also bought a flexible tyre valve extension.

This last item cost me 10 quid and should be enough to solve the problem but since my 240D mostly "hibernates" during the winter months it's good to have an air compressor at hand to keep the tyres tip top without going out on the road.

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