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Home >> GMC >> 2021 >> Yukon XL AT4 >> Repair and Diagnosis >> Engine Mechanical >> Mechanical >> Engine Mechanical - 5.3L (L84) Or 6.2L (L87) - Repair Instructions ( 2 Of 12) >> Repair Instructions >> Engine Block Overhaul >> Measuring Cylinder Bore Out-of-Round

Measuring Cylinder Bore Out-of-Round

  1. Measure both the thrust and non-thrust cylinder diameter at 12 mm (0.472 in) below the deck. Record your measurements.
  2. Calculate the difference between the 2 measurements. The result will indicate out-of-round at the upper end of the cylinder.
  3. Measure both the thrust and non-thrust cylinder diameter at 127 mm (5.001 in) below the deck surface. Record your measurements.
  4. Calculate the difference between the 2 measurements. The result will indicate out-of-round at the lower end of the cylinder.
  5. Compare your results with the Engine Mechanical Specifications (L84) , or Engine Mechanical Specifications (L87) . If the cylinders exceed these specifications, the engine must be replaced.
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