Manufacturer communication — 2006 GMC YUKON DENALI XL

• Applies to 2024 and earlier GM passenger cars and trucks.

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  Models: 2024 and Prior GM Passenger Cars and Trucks

Steps to confirm (in the document’s order)

• Refer to the Engine Mechanical Specification in SI for the correct bore and piston specification.

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  Refer to the Engine Mechanical Specification in SI to get the correct bore and piston specification.

Repair

1. When installing a piston into a cylinder, use a ring compressor sleeve or equivalent for best results.

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   When installing a piston into a cylinder, use a ring compressor sleeve or equivalent for best results.

2. Choose a sleeve with a smooth radius that tapers down to the specific bore size.

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   Smooth radius that tapers down to the specific bore size.

3. Select a size only slightly bigger than the piston diameter and not larger than the cylinder bore diameter.

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   Select a size that is only slightly bigger than the diameter of the piston and not larger than the diameter of the cylinder bore.

Caution

• If a sleeve is unavailable in the needed size, a universal ring compressor will work but is more difficult to use.

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  If a ring compressor sleeve is unavailable in the size you need, a universal ring compressor will work, but is more difficult to use.