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Old 02-12-2010, 03:55 PM   #1
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Gray valve stem cap????

I am missing one and need to find them. Mopar only sells the black ones. Anyone else ever come across this and know where to get them???

Thanks

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Old 02-12-2010, 06:50 PM   #2
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Stop by a repair shop or any shop that does tires and ask them. They sometimes keep a small collection of caps laying around so they might be able to find you a grey one.

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Old 02-12-2010, 06:55 PM   #3
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Wouldn't it be easier to buy 4 black ones?
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Old 02-12-2010, 08:54 PM   #4
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^^^^ x2. Or you could "borrow" one from another JK on the dealers lot....
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Old 02-12-2010, 09:09 PM   #5
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Old 02-14-2010, 05:23 AM   #6
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Old 02-14-2010, 09:44 AM   #7
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I like to add a word of caution with valve caps...NO metal valve stem caps...on TPMS !!!!!

A few years ago, I had some fancy aluminum shell casing type valve caps. Got to replace (upgrade) my tires last year and they couldn't remove the valve caps. They were corroded onto the stem and the stem broke off during the effort to remove that stupid cap.. (had to pay for three new sensors...)

What happened was very simple. Two different metals and the "galvanic" effect created this corrosion/weld condition.. Also keep in mind that the valve stem has some more copper in the alloy to improve transmission for the TPMS signal..This very very small current is enough to trigger this galvanic effect...

No more metal caps..only use TPMS approved or compatible caps...

Just wanted to share this ..(lessons learned the hard $$$ way)
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Old 02-14-2010, 10:38 AM   #8
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Old 02-15-2010, 11:23 AM   #9
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I like to add a word of caution with valve caps...NO metal valve stem caps...on TPMS !!!!!

A few years ago, I had some fancy aluminum shell casing type valve caps. Got to replace (upgrade) my tires last year and they couldn't remove the valve caps. They were corroded onto the stem and the stem broke off during the effort to remove that stupid cap.. (had to pay for three new sensors...)

What happened was very simple. Two different metals and the "galvanic" effect created this corrosion/weld condition.. Also keep in mind that the valve stem has some more copper in the alloy to improve transmission for the TPMS signal..This very very small current is enough to trigger this galvanic effect...

No more metal caps..only use TPMS approved or compatible caps...

Just wanted to share this ..(lessons learned the hard $$$ way)
I never even thought of that.

I do have a set of no-loss on order. They're brass with o-rings. I'm going to take some precise measurements and check for current, etc.
I have $150,000 meters at my disposal; might as well use them...
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Old 02-15-2010, 11:51 AM   #10
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well HD, curren flow isn't important, even measured with Lab instrumentation

Any time you mix DIFFERENT metals you will get an electric trade (Thermocouple),but

You can lesson the metalic decay, by using a dielectric gel, to reduce the metal/metal contact-

Of course for tire valve stems, you should use PLASTIC, doesn't matter what color, but they're cheap and easily replaceable and you'll have NO DISSIMILAR metal chemical problems

This same metel characteristic has been studied and corrected in Nuclear Submarine reactor compartments, for years (don't ask me how I know)

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Old 02-15-2010, 12:43 PM   #11
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plastic <thumbsup> is the way to go baby, about a dollar or less at any autoparts store for four!!
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Old 02-15-2010, 12:57 PM   #12
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Then dielectric it will be. I must have my no-loss caps!

Can I still use my T-Rex on them and check for escaping electrons?
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Old 02-15-2010, 01:29 PM   #13
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yes please do i think that would be interesting to find out.
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Old 02-15-2010, 02:42 PM   #14
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yes please do i think that would be interesting to find out.
The guy (Mark Zachmann) who invented TPMS used to work in the lab here. I'll get one of the gizmo-heads to figure out what we can hook up to it.
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Old 02-15-2010, 02:55 PM   #15
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Well HD, if you're going to check/moniter the electrical (Galvanic) output (micro-volts) in each stem, be sure and keep the No. of threads engaged on each stem, equal-or the staggering output, will vary

If you're going to do that, don't use a dielectric gel

Otherwise, put that in your "things to do" list

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Old 02-16-2010, 07:38 AM   #16
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Jimbo,
Do you know what kind of sensors are being used? Does the receiver poll them, ping them to wake them up? They're not the battery-less type, are they?
A frequency would be good too...
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Old 02-16-2010, 08:29 AM   #17
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No, I don't HD, but let me give you the data off one of the pressure sensitive transmitters


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Jimbo,
Do you know what kind of sensors are being used? Does the receiver poll them, ping them to wake them up? They're not the battery-less type, are they?
A frequency would be good too...
Daimler-Chrysler FCC-MRXDCA315TX1
IC#2546A-MRXDCA315TX1 SE1

PPA 3F33

See what you can find from that-good luck

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Old 02-16-2010, 09:10 AM   #18
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Dang.
They're made in Ireland. I'll ping our office in Scotland and see if they support Schrader.
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Old 02-16-2010, 09:57 AM   #19
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I've queried Shrader in Northern Ireland and am interested in their recommendations.

Mark got back to me though and sent these links:
The Importance Of Dielectric Insulators
Basics of Corrosion Chapter AIS Metallurgical Testing in association with AIS Technical Training - Introduction to Steel Industry of Metallurgy...a Metallurgical Tutorial of steels and metals

Our greatest threat and the chief contributor for galvanic reaction is water. Those of us in saltier climates or where salt is used for snow are at greater risk.

I really never even thought of this....
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Old 02-16-2010, 10:15 AM   #20
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Yes and one must be careful while taking a shower--

When you have a PACEMAKER, made in CHINA !!

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Old 02-16-2010, 06:36 PM   #21
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Quote:
Originally Posted by USAntigoon View Post
I like to add a word of caution with valve caps...NO metal valve stem caps...on TPMS !!!!!

A few years ago, I had some fancy aluminum shell casing type valve caps. Got to replace (upgrade) my tires last year and they couldn't remove the valve caps. They were corroded onto the stem and the stem broke off during the effort to remove that stupid cap.. (had to pay for three new sensors...)

What happened was very simple. Two different metals and the "galvanic" effect created this corrosion/weld condition.. Also keep in mind that the valve stem has some more copper in the alloy to improve transmission for the TPMS signal..This very very small current is enough to trigger this galvanic effect...

No more metal caps..only use TPMS approved or compatible caps...

Just wanted to share this ..(lessons learned the hard $$$ way)


A little dab of anti seaze is all you need. Put a dab on there when you rotate your tires since you shoul be putting a bit of anti seaze where the wheel touches the hub...
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Old 02-16-2010, 06:41 PM   #22
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You can even use a thin coating of silicone grease or a waterproof grease. All you need to do is provide a barrier between the dissimilar metals...the marine industry has been doing it for years, but for some reason, other indutries have not figured it out yet...
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Old 02-16-2010, 06:53 PM   #23
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A little dab of anti seaze is all you need. Put a dab on there when you rotate your tires since you shoul be putting a bit of anti seaze where the wheel touches the hub...
I am done with metal caps..Thanks for the feedback anyway..
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Old 02-16-2010, 07:01 PM   #24
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I am done with metal caps..Thanks for the feedback anyway..

No problem at all, just trying to pass on a little info...
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Old 02-16-2010, 07:12 PM   #25
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Didn't realize there was so much information on gray valve stem caps!! I'm just glad mine are black.
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Old 02-20-2010, 07:57 AM   #26
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^^^^ x2. Or you could "borrow" one from another JK on the dealers lot....
Second that. Bring it back when you are done with it. Might have to borrow one to put in the glove box next time I stop by.

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