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Home >> Buick >> 2015 >> Regal GS, AWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 1 (Engine Mechanical - 2.4L) >> Repair Instructions - Off Vehicle >> Engine Block Cleaning and Inspection >> Measuring Cylinder Bore Taper

Measuring Cylinder Bore Taper

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    Fig 1: Measuring Head Gasket Dimensions
    GM4973Courtesy of GENERAL MOTORS COMPANY
  1. Measure the cylinder bore along the thrust surfaces, perpendicular to the crankshaft centerline, at 13 mm (0.510 in) below the deck surface (1) and record your measurement.
  2. Measure the cylinder bore along the thrust surfaces, perpendicular to the crankshaft centerline, at 100 mm (3.938 in) below the deck surface (2) 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 (LEA, or LUK) , . If the cylinders exceed the specifications, replace the engine block