Corvette V8-6.2L (2008)
Important
Other forms of slow air leaks are possible. If the body of the tire, valve stem and wheel flange show no signs of air seepage, refer to
Corporate Bulletin Number 05-03-10-003D for additional information on possible wheel porosity issues.
3. Bead seat corrosion is identified by what appears like blistering of the wheel finish, causing a rough or uneven surface that is difficult for the tire to
maintain a proper seal on. Below is a close-up photo of bead seat corrosion on an aluminum wheel that was sufficient to cause slow air loss.
Close-Up of Bead Seat Corrosion
4. If corrosion is found on the wheel bead seat, measure the affected area as shown below.
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For vehicles with 32,186 km (20,000 mi) or less, the total allowable combined linear area of repairable corrosion is 100 mm (4 in) or less. If
the total area(s) of corrosion exceed these dimensions, the wheel should be replaced.
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For vehicles that have exceeded 32,186 km (20,000 mi), the total allowable combined linear area of repairable corrosion is 200 mm (8 in) or
less. If the total area(s) of corrosion exceed these dimensions, the wheel should be replaced.
5. In order to correct the wheel leak, use a clean-up (fine cut) sanding disc or biscuit to remove the corrosion and any flaking paint. You should
remove the corrosion back far enough until you reach material that is stable and firmly bonded to the wheel. Try to taper the edge of any flaking
paint as best you can in order to avoid sharp edges that may increase the chance of a leak reoccurring. The photo below shows an acceptable
repaired surface.
Notice
Corrosion that extends up the lip of the wheel, where after the clean-up process it would be visible with the tire mounted, is only acceptable on the
inboard flange. The inboard flange is not visible with the wheel assembly in the mounted position. If any loose coatings or corrosion extend to the
visible surfaces on the FACE of the wheel, that wheel must be replaced.
Important
Remove ONLY the material required to eliminate the corrosion from the bead seating surface. DO NOT remove excessive amounts of
material. ALWAYS keep the sealing surface as smooth and level as possible.
