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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 638 (Engine Mechanical - 4.0L (Unit Repair)) >> Repair Instructions >> Engine Block Cleaning and Inspection -Upper >> Cylinder Bore Taper Measurement Procedure

Cylinder Bore Taper Measurement Procedure

WARNING: This page is about a different car, the 2002 Oldsmobile Aurora and 2001 Oldsmobile Aurora. However, it is still accessible from the selected car via links, so may be relevant.
  1. Measure the cylinder bore along the thrust surfaces at 5 mm (0.200 in) below the deck surface with the bore gage perpendicular to the crankshaft centerline and record the measurements.
  2. Measure the cylinder bore along the thrust surfaces at 102 mm (4.000 in) below the deck surface with the bore gage perpendicular to the crankshaft centerline and record the measurements.
  3. Calculate the difference between the two measurements. The result will be the cylinder taper.
  4. Compare your results with the engine mechanical specifications. If the cylinders exceed these specifications, replace the cylinder block.
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