My mini truck is used off road.. lowering tire pressure and pumping them back up is part of the game.
It’s spring and as the weather improves, I attempt to get things sorted for this year’s use.. The Mini truck had two low tires, and as I attempted to unscrew the valve cap, I realized I had stuck ones for the first time in my life! Sixty five years of living and never once have I fought this trouble.
The problem? The cap is made of some type of alum alloy, easy to machine, longer tool life, but it can and does react with the metal used in the valve stem, so nobody.. till now has made one that I know of.
I leave it to you to figure.. was it a person who didn’t know better, or a person who didn’t care better?
If you have these, get them off your vehicle.. I have two that I have heated, and dowsed with penetrant a bunch.. no joy yet..
BEWARE! Ebay is full of cheap beautiful in appearance valve caps! They are made of Aluminum and at least in my climate, a generous amount of aluminum oxide was formed and made it impossible to take the cap off!
After some days of soaking with penetrant, Brian W. said he had read that Ammonia could break that corrosion between alum and steel, and suggested I give it a try with alum to brass. I used a die grinder to cut off the end and then a Q-tip to keep swabbing on ammonia, within 2 minutes the bond began to break, and I kept twisting the cap back and forth and finally the cap was off.. did the other side and now I’m set to put on stainless steel or plastic..
Is this a link to more trouble? I dunno….. http://www.ebay.com/itm/New-4-pcs-Hexagonal-Ventil-Valve-Cap-For-Auto-Car-Truck-Silver-/271036711380?pt=Motors_Car_Truck_Parts_Accessories&hash=item3f1b0c01d4&vxp=mtr
Thanks for the Ammonia Brian!