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Servicing Tyre Pressure Sensors.
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Author Post
gmerry   
Sun May 06 2012, 02:51pm
Member No: #11625
Joined: Nov 30 2009
Location: aberdeen
 Hi, the mechanics guide recommends replacing the alloy stems, seals and inner valve core when the tyres are replaced. We all know of people that have had the valve fail in service (due to corrosion and fatigue) so this is probably good advice.

I've not had a lot of sucess with tyre fitters and servicing these valves. At the first tyre fitter, we agreed to just leave in situ because the fitter did not have the T5 screwdriver to under the screw that holds the aerial tag onto the stem.

At the 2nd place, we agreed that I would undo the stem nuts and basically because of the corrosion, the entire transmitter was destroyed.

A 3rd approach is to machine out the old stem. As per the photos, I used a 10mm counterbore drill bit which has a 4.2mm pilot. Drill Services of Horley suppplied this. - Click Here - The Pilot prevents the drill slipping and marking your nice alloy wheel. The pilot also stops the swarf falling inside the tyre. The 10mm bit removes all the thread and then the transmitter will just fall back into the wheel without any damage. Retrieve this as part of the tyre changing exercise and fit a new service stem and seal. I used a bit of WD40 on the bit to stop the aluminium welding itself to the bit.

Regards
G
1 User said Thank You to gmerry for this Post :
 Biohead (06 May 2012 : 16:37)
Biohead   
Sun May 06 2012, 04:37pm

Member No: #6049
Joined: Nov 05 2008
Location: Bracknell
 Nice work there G - where did you source the new stems from?
gmerry   
Sun May 06 2012, 05:43pm
Member No: #11625
Joined: Nov 30 2009
Location: aberdeen
 Hi Biohead, I purchased these from ebay about £10 a pop more than a year ago.

- Click Here -

- Click Here -



Any of the Siemens VDO fitment vehicles (Ford, Landrover, PSA etc) would work.

Looking through ebay, seems prices have gone up a lot.

I would phone up one of the suppliers such as TyreBayDirect - Click Here - and get a price for spare stem kit. I see some of the service kits just have the stem nut and seal which is a bit useless if corrosion has set in.

Regards

G
1 User said Thank You to gmerry for this Post :
 ken1202 (24 Sep 2012 : 14:33)
 

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