WARNING re. metal valve stems

JPNNH

New member
My 2006 4Runner has metal valve stems on chrome wheels...its the air pressure sensor type. The metal caps on the valve stems were frozen on....I needed pliers to remove them. In the process I wiped the threads off of 1 stem & completely broke the top off another one. The caps are sturdier than the metal (aluminum) valve stems... The dealer wanted $200 each to repair them (the stems themselves are $150 each) then labor, rebalance each tire, calibrate sensors etc.... The dealer said he has seen many of these caps seize on the stems & after the repair (lucky they were still under warranty) replaced the caps with plastic ones. IF YOU HAVE METAL CAPS I HIGHLY RECOMMEND YOU REMOVE THEM BEFORE ITS TOO LATE!
 
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Interesting... I really like the little metal caps. But thats not worth 200 bucks. Were you actually in cold weather or did they just corrode over time and stick to the stem?
 
I live in NH so I do not know if the road salt contributed to this or the metal just corroded & fused itself to the threads
 
In salty Florida air, I have to wipe the threads with some silicone paste, I use spark-plug boot grease. It seems to work well, without it I get exactly what you're talking about, corrosion!:mad: I use very little and like the super-thick grease as I don't want to get grease and dirt in the valve stem itself.

Aftermarket steel, chromed caps etc can exacerbate the problem.

:cheers:
 
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I guess mine are on and off with regularity as I'm always checking my tire pressure of airing down off road since my metal caps have had no issues over 4 years.
 
I didn't have such thing happen to me on my 4Runner...

however...it did happen to my 2007 Camry.

I brought it in the Dealer last week & they needed a plier to remove the cap. That thread on that valve stem is cross-thread. They told me since those are not OEM wheels, they can't do anything about it.

My dad had those aftermarket wheels installed at the Dealer he bought the car. So I told him to take it back to his Dealership.

In the mean time...I have a black plastic cap on that wheel. And it works, it come off easily.

Thank you for bringing up this Thread...my other (3) caps seem to be rubbing & squeaking when I take them off. Perhaps I should put black caps on those as well.
 
OEM caps are alluminum, and those will fuse to stems over some time. I got set of chrome caps @ Autozone and those work perfectly not to mention they look better. Also, put a touch of anti-seize on stems - and the problem is solved.
 

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