For 1990-2009 cars

# LEAKING CAST ALUMINUM WHEELS (REPAIR WITH ADHESIVE SEALANT)

#### SUBJECT: LEAKING CAST ALUMINUM WHEELS - REPAIR WITH ADHESIVE SEALANT

#### MODELS/YEARS: 1993 AND PRIOR CARS AND TRUCKS

Should a vehicle equipped with cast aluminum wheels exhibit a slow leak due to a porous condition existing in the wheel, the wheel can be repaired by using *Dow Corning Silastic 732 RTV, P/N 1052366 or equivalent, as described in the following procedure:

1. Remove tire-wheel assembly from vehicle.

2. Locate leaking area by inflating tire to 40 psi and dipping tire-wheel assembly in water bath.

3. If air bubbles are observed, mark leak area and remove tire from wheel.

4. Scuff INSIDE rim surface at leak area with #80 grit paper and clean area with general purpose cleaner, such as *3M #08984.

5. Apply 3 mm (1/8") thick layer of adhesive/sealant to leak area on INSIDE of rim and allow six hours of drying time.

6. Mount tire on wheel, pressurizing to 40 psi and check for leaks.

#### Note: Caution must be used when mounting the tire so as not to damage the sealer.

7. Adjust tire pressure to meet placard specification.

8. Balance tire-wheel assembly, using proper coated weights.

9. Water test wheel again.

10. Reinstall tire-wheel assembly on vehicle.

Parts are currently available from GMSPO.

#### WARRANTY INFORMATION:

Labor Operation Number: E0420

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