Manufacturer communication — 2006 GMC YUKON DENALI XL

• 2015 and prior GM passenger cars and trucks.

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  Models: 2015 and Prior GM Passenger Cars and Trucks

Steps to confirm (in the document’s order)

• Take the correct bore and piston specification from the Engine Mechanical Specification in SI.

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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 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.

3. The sleeve should compress the piston rings smoothly and evenly.

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   Sleeve should compress the piston rings smoothly and evenly.

Caution

• If a sleeve is not available 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.