The last 17"o ring grove I cut to spec. failed I had to screed the grove half
full of black urethane wdsd. caulk. It then worked fine. Jack
-------------- Original message --------------
From: "Rick Byrnes" <Rick@RBMotorsports.com>
> Jim
> If the wheels have an "O" ring groove, a rubber O ring will do the job
> nicely, helped with a little vacuum grease or at worse RTV. If the surfaces
> are unblemished no crutch is needed. The real deal for rubber gasketing is
> making the groove to design spec, and squeezing the rubber 15 to 20 %. My
> little 500X5 Garlits tire 2 piece wheels are alum with 0 ring grooves, and
> only 2 of them currently leak :-D
> That's kind of why I added the bit about crutches.
> If the wheels have grooves, I can help with 0 ring selection, but if you can
> get your hands on an O ring handbook, the groove vs. O ring dimensions are
> clearly defined for face sealing that we are dealing with here.
> If you need help feel free to ask. I'm not always quick to respond, but I
> will and I do have a Parker handbook.
> I"ll be more than happy to help.
> If wheels are large, sealing may be a little tougher, but all the same
> principles apply. (if you have a groove)
> There is a major problem using rtv in any joint that has a chance of parts
> moving relative to each other. The shear strength is quite low, and
> movement as little as .004" will cause adhesive delamination and leaks.
>
> Rick
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