Measuring Procedure

Engine Block Flatness Inspection

1. Courtesy of GENERAL MOTORS COMPANY

   Inspect the engine block as shown for flatness and distortion along the diagonal. Use a straight edge (1) and a feeler gauge (2). If the deck surface is out of specification, replace the block. Do NOT machine the block. Refer to Engine Mechanical Specifications  for the recommended limits.

2. Courtesy of GENERAL MOTORS COMPANY

   Inspect the engine block as shown for flatness and deflection along the length and width. Use a straight edge (1) and a feeler gauge (2). If the deck surface is out of specification, replace the block. Do NOT machine the block. Refer to Engine Mechanical Specifications  for the recommended limits.

Cylinder Sleeve Diameter Inspection

1. Courtesy of GENERAL MOTORS COMPANY

   Measure the cylinder bores at the following measure points, use the EN-8087  Cylinder Bore Gauge:

   1. 10 mm (0.394 in) (1).
   2. 35 mm (1.378 in) (2).
   3. 100 mm (3.937 in) (3).

2. Courtesy of GENERAL MOTORS COMPANY

   NOTE:

   If the cylinder sleeve measurements are not within the recommended limits, ream the cylinder bores with the recommended oversize.

   Inspect the cylinder bores, use the EN-8087  Cylinder Bore Gauge (1). Inspect for the following items:

   • Wear of cylinder sleeve
   • Cylinder sleeve diameter
   • Tapering of cylinder sleeve
   • Oval status of cylinder sleeve

     Refer to Engine Block Cleaning and Inspection  for the recommended limits.

Bearing Bore Diameter In Cylinder Block Inspection

1. Courtesy of GENERAL MOTORS COMPANY

   NOTE:

   Install the crankshaft bearing caps in the same position as removed.

   Crankshaft Bearing Cap (2) - Install [4x]

2. Crankshaft Bearing Cap Bolt (1) - Install [8x] - Crankshaft and Bearing Installation 

3. Courtesy of GENERAL MOTORS COMPANY

   Inspect the bearing bore diameter (1) in the cylinder block using the EN-8087  Cylinder Bore Gauge. Refer to Engine Mechanical Specifications  for the recommended limits.

4. Courtesy of GENERAL MOTORS COMPANY

   NOTE:

   Organize the components in the order removed.

   Crankshaft Bearing Cap Bolt (1) - Remove and DISCARD [8x]

5. Crankshaft Bearing Cap (2) - Remove [4x]