Valve Cores
Thread Starter
Racer
Joined: Apr 2012
Posts: 314
Likes: 4
From: Ontario
Valve Cores
Our C6 has the valve stems with the monitoring system. I may have a valve stem leak and was wondering if the cores in these are the same as those used in the old days, (1969) I have plenty of those if they will work.
Team Owner
Joined: Sep 2005
Posts: 20,352
Likes: 568
From: Ventura County, Calif
I've never replaced one but here's some info from our resident expert. Hope it helps. 
Our sensors are made by Schrader.
Actually, Schrader makes "dress-up sleeves" in chrome, or "chromed" plastic - I'm not sure what they're made out of. And I don't know where to get them. Here's a link to their site:
http://www.schrader-bridgeport.com/i...=96&Itemid=172
There are generally 2 problems with using chrome nuts/sleeves/valve stem caps, etc.
So....if these dress-up sleeves are from Schrader, I'm sure they are okay to use!
BTW, the retaining nuts have a very low torque spec: 62 INCH-lbs (that's only 5 ft-lbs). If the retaining nut is torqued too tight it creates a common problem of a slow leak around the valve stem due to the grommet being cut or distorted.
Bob
Actually, Schrader makes "dress-up sleeves" in chrome, or "chromed" plastic - I'm not sure what they're made out of. And I don't know where to get them. Here's a link to their site:
http://www.schrader-bridgeport.com/i...=96&Itemid=172
There are generally 2 problems with using chrome nuts/sleeves/valve stem caps, etc.
Dissimilar metal corrosion from a steel nut on the aluminum valve stem
The valve stem is part of the antenna system of the tire pressure sensor, and chromed metal nuts/caps could attenuate the signal and give intermittent reception problems of the signal by the receiver in the TPMS computer in the car
The same goes for the valve stem core. Here's a quote from that site linked above:The valve stem is part of the antenna system of the tire pressure sensor, and chromed metal nuts/caps could attenuate the signal and give intermittent reception problems of the signal by the receiver in the TPMS computer in the car
Always use new grommets, nuts, plastic or nickel-plated valve caps and electroless, nickel-plated valve cores (Service Pack) when performing any tire service.
Never use a brass valve core or un-plated brass cap with an aluminum TPMS sensor stem. Contact between dissimilar metals may cause galvanic corrosion, which can lead to loss of air pressure.
Refer to manufacturer's specifications for proper torque requirements when replacing nuts and valve cores.
Never use a brass valve core or un-plated brass cap with an aluminum TPMS sensor stem. Contact between dissimilar metals may cause galvanic corrosion, which can lead to loss of air pressure.
Refer to manufacturer's specifications for proper torque requirements when replacing nuts and valve cores.
So....if these dress-up sleeves are from Schrader, I'm sure they are okay to use!
BTW, the retaining nuts have a very low torque spec: 62 INCH-lbs (that's only 5 ft-lbs). If the retaining nut is torqued too tight it creates a common problem of a slow leak around the valve stem due to the grommet being cut or distorted.
Bob
