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Home >> Buick >> 2005 >> Allure CXS >> Repair and Diagnosis >> Engine Mechanical >> Mechanical >> Engine Mechanical - 3.6L (Ly7) (Repair Instructions -- 3 Of 5) >> Off-Vehicle Repair Instructions - Part 2 >> Engine Block Cleaning and Inspection >> Measuring Cylinder Bore Taper

Measuring Cylinder Bore Taper

  1. Measure the cylinder bore along the thrust surfaces, perpendicular to the crankshaft centerline, at 10 mm (0.397 in) below the deck surface and record your measurement.
  2. Measure the cylinder bore along the thrust surfaces, perpendicular to the crankshaft centerline, at 100 mm (3.976 in) below the deck surface and record your measurement.
  3. Calculate the difference between the 2 measurements. The result will be the cylinder taper.
  4. Compare your results with the Engine Mechanical Specifications . If the cylinders exceed the specifications, the cylinder 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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