Manufacturer communication — 2006 GMC YUKON DENALI XL

• 2005-2015 GM passenger cars and light duty trucks.

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  2005-2015 GM Passenger Cars and Light Duty Trucks

• A tire slowly loses air pressure over a period of days or weeks.

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  Some customers may comment on a tire that slowly loses air pressure over a period of days or weeks.

Possible causes

• Abrasive elements from the environment get between the tire and the wheel at the bead seat, and the relative motion between tire and wheel lets them wear both materials.

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  Abrasive elements in the environment may intrude between the tire and wheel at the bead seat. There is always some relative motion between the tire and wheel (when the vehicle is driven) and this motion may cause the abrasive particles to wear the wheel and tire materials.

Steps to confirm (in the document’s order)

1. The corrosion may be on the inboard or outboard bead seat and is not visible until the tire is dismounted from the wheel.

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   This corrosion may appear on the inboard or outboard bead seating surface of the wheel. This corrosion will not be visible until the tire is dismounted from the wheel.

2. After a water dunk tank leak test, if the leak is around the bead seat of the wheel, dismount the tire and examine the bead seat.

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   After a water dunk tank leak test, if you determine the source of the air leak to be around the bead seat of the wheel, dismount the tire to examine the bead seat.

3. Bead seat corrosion looks like blistering of the wheel finish, leaving a rough or uneven surface on which the tire cannot keep a proper seal.

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   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.

4. At 32,186 km (20,000 mi) or less, the total combined linear length of repairable corrosion is 100 mm (4 in) or less; beyond that, replace the wheel.

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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.

5. Above 32,186 km (20,000 mi), the total combined linear length of repairable corrosion is 200 mm (8 in) or less; beyond that, replace the wheel.

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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.

Repair

1. Remove the corrosion and any flaking paint with a clean-up (fine cut) sanding disc or biscuit, back to material that is stable and firmly bonded to the wheel.

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   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.

2. Coat the repaired area with a commercially available tire sealant such as Patch Brand Bead Sealant or equivalent.

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   Once the corrosion has been eliminated, you should coat the repaired area with a commercially available tire sealant such as Patch Brand Bead Sealant or equivalent.

Caution

• Remove only the material needed to eliminate the corrosion from the bead seat; keep the sealing surface as smooth and level as possible.

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  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.

• If loose coatings or corrosion extend to the visible surfaces on the face of the wheel, the wheel must be replaced.

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  If any loose coatings or corrosion extend to the visible surfaces on the FACE of the wheel, that wheel must be replaced.