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Home >> Chevrolet >> 2014 >> Express 1500 LS, AWD >> Repair and Diagnosis >> Engine Mechanical >> Mechanical >> Engine Mechanical - 4.8L (L20), 5.3L (LMF), Or 6.0L (L96 LC8) - Repair Instructions - Off Vehicle >> Repair Instructions - Off Vehicle >> Engine Block Cleaning and Inspection >> Measuring the Cylinder for Oversize

Measuring the Cylinder for Oversize

    Fig 1: Measuring Bore Gauge With Micrometer
    GM4974Courtesy of GENERAL MOTORS COMPANY
  1. Adjust the micrometer to a dimension slightly smaller than the bore size. Refer to Engine Mechanical Specifications (RPO LMF VIN 4) , Engine Mechanical Specifications (RPO L20 VIN A) , Engine Mechanical Specifications (RPO LC8 VIN B) , Engine Mechanical Specifications (RPO L96 VIN G) .
  2. Insert the J 8087  gauge into the micrometer and zero the bore gauge dial.
    3. Fig 2: Measuring Cylinder Bore
    GM4972Courtesy of GENERAL MOTORS COMPANY
  3. Use the J 8087  gauge and measure the cylinder bore for oversize.

    Slide the bore gauge 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 (RPO LMF VIN 4) , Engine Mechanical Specifications (RPO L20 VIN A) , Engine Mechanical Specifications (RPO LC8 VIN B) , Engine Mechanical Specifications (RPO L96 VIN G) .

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