1984 - 1987 Corvette: Service Bulletin: Cast Aluminum Wheel Porosity Repair
Source: Chevrolet Dealer Service Bulletin
Subject: Cast Aluminum Wheel Porosity Repair
Model and Year: All Models with Cast Aluminum Wheels
Bulletin Number: 87-89
Date: Mar., 1987
TO: ALL CHEVROLET DEALERS
Should a vehicle with cast aluminum wheels exhibit a slow air leak due to a porous condition existing in the wheel, the wheel can be repaired by using Dow Corning Silastic 732 RTV, part number 1052366 or equivalent as described in the following procedure:
- Remove wheel and tire assembly from car.
- Locate leaking areas by inflating tire to 50 PSI and dipping wheel-tire assembly in to water bath.
- Mark leak areas and remove tire from wheel.
- Scuff inside rim surface at leak area with #80 grit paper and clean area with general purpose cleaner such as 3M #08984.
- Apply 1/8" thick layer of adhesive/sealant to leak area and allow six hours of drying time.
- Mount tire on wheel, pressurize to 50 PSI and check for leaks.
- Adjust tire pressure to meet specifications.
NOTICE: Caution must be used when mounting the tire so as not to damage the sealer.
- Balance wheel and tire assembly.
- Water test wheel again.
- Reinstall wheel-tire assembly on car.