Valve Stem Caps
Le Mans Master
Joined: Dec 2005
Posts: 7,753
Likes: 210
From: North Western Connecticut
I put some on my 4runner with disastrous results! The fancy caps WELDED themselves to the valve stems. There was simply no way to get 2 of them off when I needed to service the tires. Wound up having to replace 2 internal tp pressure monitors because they broke while trying to get the valve caps off. I also had used never seize on but it didn't work...... I will never EVER use them again because it turned into a VERY expensive exercise.
Team Owner
Joined: Nov 2007
Posts: 45,273
Likes: 8,545
From: Rochester, NY
This should do it!!What you'd be facing is galvanic corrosion. It is caused by the reaction of two dissimmilar metals in contact with each other. The table below shows the reaction potential of the materials which will form the anode and cathode in the case of assembly. Of note is the distance the metals are apart.
In the case of Chrome plated caps, they will actually reduce the potential for galvanic corrosion as they are closer together on the table (as long as the chrome plating on the threads holds up) once it fails then the base metal comes in to play. The elements at the top half of the table are more active (anodic) the elements at the bottom of the table are more passive (cathodic).
Electrode Potential at 77 F (25 C)
Anodic end (this is where the corrosion occurs)
Element Standard Electrode Potential (Volts)
Lithium -3.045
Potassium -2.920
Sodium -2.712
Magnesium -2.340
Beryllium -1.700
Aluminum -1.670
Manganese -1.050
Zinc -0.762
Chromium -0.744
Iron; Mild Steel -0.440
Cadmium -0.402
Yellow Brass -0.350
50-50 Tin-Lead Solder -0.325
Cobalt -0.277
Nickel -0.250
Tin -0.136
Lead -0.126
Hydrogen reference electrode 0.000
Titanium +0.055
Copper +0.340
Mercury +0.789
Silver +0.799
Carbon +0.810
Platinum +1.200
Gold +1.420
Graphite +2.250
In the case of Chrome plated caps, they will actually reduce the potential for galvanic corrosion as they are closer together on the table (as long as the chrome plating on the threads holds up) once it fails then the base metal comes in to play. The elements at the top half of the table are more active (anodic) the elements at the bottom of the table are more passive (cathodic).
Electrode Potential at 77 F (25 C)
Anodic end (this is where the corrosion occurs)
Element Standard Electrode Potential (Volts)
Lithium -3.045
Potassium -2.920
Sodium -2.712
Magnesium -2.340
Beryllium -1.700
Aluminum -1.670
Manganese -1.050
Zinc -0.762
Chromium -0.744
Iron; Mild Steel -0.440
Cadmium -0.402
Yellow Brass -0.350
50-50 Tin-Lead Solder -0.325
Cobalt -0.277
Nickel -0.250
Tin -0.136
Lead -0.126
Hydrogen reference electrode 0.000
Titanium +0.055
Copper +0.340
Mercury +0.789
Silver +0.799
Carbon +0.810
Platinum +1.200
Gold +1.420
Graphite +2.250
Safety Car
Joined: Oct 2004
Posts: 3,786
Likes: 0
From: Pleasanton California
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Melting Slicks
Joined: Apr 2006
Posts: 3,325
Likes: 426
From: Minnesota
I have always enjoyed your comments based on your Vette expertise. Please ignore the previous post, the vast majority of us do appreciate your posts!
Drifting
Joined: Nov 2004
Posts: 1,650
Likes: 269
From: Cape Canaveral Florida
St. Jude Donor '07 thru '26
NCM Lifetime Member
Originally Posted by talon90
Any particular reason you needed to attack my post? I was simply trying to provide complete information. I'll not bother to post in the future if it upsets you so much....geez.
talon90,
I have always enjoyed your comments based on your Vette expertise. Please ignore the previous post, the vast majority of us do appreciate your posts!
Any particular reason you needed to attack my post? I was simply trying to provide complete information. I'll not bother to post in the future if it upsets you so much....geez.
talon90,
I have always enjoyed your comments based on your Vette expertise. Please ignore the previous post, the vast majority of us do appreciate your posts!
Keep posting ... I usually learn something.BTW, as an engineer I agree with the technical content, but I ran chrome caps on my C5 for 9 years (97-07) and on my C6 for a year with no worries ... and this on the beach in Florida!
Race Director
Joined: Dec 2006
Posts: 11,762
Likes: 2
Le Mans Master
Joined: May 2005
Posts: 6,659
Likes: 828
From: FORT LAUDERDALE FL
Le Mans Master
Joined: Apr 2006
Posts: 7,158
Likes: 152
From: Chicago IL
Drifting
Joined: Apr 2007
Posts: 1,768
Likes: 19
From: ABQ NM
Subaru says a non-OEM valve cap "may" cause signal interference .......on Subarus.
http://endwrench.com/images/pdfs/KeepEWAug07.pdf
From Endwrench page 11.
"...Also, the valve stem of the wheel sensors serves as the
transmitting antenna, so don’t replace the original valve caps
with any other type that may interfere with the signal. ■
Always follow...."
http://endwrench.com/images/pdfs/KeepEWAug07.pdf
From Endwrench page 11.
"...Also, the valve stem of the wheel sensors serves as the
transmitting antenna, so don’t replace the original valve caps
with any other type that may interfere with the signal. ■
Always follow...."
