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Home >> GMC >> 2025 >> Sierra 2500 HD Denali Ultimate >> Labor Times >> Other Variant >> Engine Performance >> Ignition Systems >> Engine Compression >> Testing

Engine Compression: Testing

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WARNING: This page is about the Sierra 2500 HD AT4, 6.6L Eng VIN 7, which is a different variant/trim than selected.
NOTE: Add 0.2 for wet compression retest.

Applies ToNoteStandard HoursWarranty HoursSkill Level
Gas1.4C
Combination Procedure: ENGINE CYLINDER LEAKAGE: Testing:
Gas, Each Additional0.1C
Gas, One Cylinder0.2C