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Measuring the Cylinder for Oversize

WARNING: This page is about a different car, the 2008 Buick LaCrosse and 2008 Buick Allure. However, it is still accessible from the selected car via links, so may be relevant.
    Fig 1: Measuring Bore Gauge With Micrometer
    GM4974Courtesy of GENERAL MOTORS CORP.
  1. Adjust the micrometer to a dimension slightly smaller than the bore size. Refer to Engine Mechanical Specifications .
  2. Insert the J 8087  bore gage into the micrometer and zero the bore gage dial.
    3. Fig 2: Measuring Cylinder Bore
    GM4972Courtesy of GENERAL MOTORS CORP.
  3. Using the J 8087  , measure the cylinder bore for oversize.

    Slide the bore gage up and down throughout the length of the cylinder bore. Measure the bore both parallel and perpendicular to the centerline of the crankshaft at the top, center, and bottom of the bore. A cylinder bore that exceeds the maximum diameter must be serviced with an oversized piston. Refer to Engine Mechanical Specifications .

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