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Home >> Chevrolet >> 2001 >> Venture Base, Van Passenger >> Repair and Diagnosis >> External Pages >> Different car >> Section 425 (Engine Mechanical - 4.0L (Unit Repair)) >> Repair Instructions >> Engine Block Cleaning and Inspection -Upper >> Cylinder Bore Out-of-Round Measurement Procedure

Cylinder Bore Out-of-Round 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 both the thrust and non-thrust cylinder diameter 5 mm (0.20 in) below the deck surface. Record your measurements.
  2. Calculate the difference between the two measurements. The result will indicate out-of-round at the upper end of the cylinder.
  3. Measure both the thrust and non-thrust cylinder diameter 102 mm (4.00 in) below the deck surface. Record your measurements.
  4. Calculate the difference between the two measurements. The result will indicate out-of-round at the lower end of the cylinder.
  5. Compare your results with the engine mechanical specifications. If the cylinders exceed these specifications, replace the cylinder block.
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