Cylinder Bore Out-of-Round Measurement Procedure

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.