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Home >> Buick >> 2019 >> Regal TourX Base >> Repair and Diagnosis >> External Pages >> Different car >> Section 143 (Engine Mechanical - 3.6L (LGX) - Repair Instructions) >> Repair Instructions >> Engine Block Cleaning and Inspection >> Measuring Cylinder Bore Out-of-Round

Measuring Cylinder Bore Out-of-Round

WARNING: This page is about a different car, the 2020 Buick Regal and 2019 Buick Regal. However, it is still accessible from the selected car via links, so may be relevant.
  1. Measure both the thrust and non-thrust cylinder diameter at 10 mm (0.397 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 100 mm (3.976 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 . If the cylinders exceed these specifications, the engine block may be oversized to 0.25 mm (0.010 in). There is only one size of oversized pistons and rings available for service.
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