Cylinder Bore Taper Measurement Procedure

1. Measure the cylinder bore along the thrust surfaces (perpendicular to the crankshaft centerline) at 5 mm (0.20 in.) below the deck surface and record your measurement.
2. Measure the cylinder bore along the thrust surfaces (perpendicular to the crankshaft centerline) at 102 mm (4.00 in.) below the deck surface and record your measurement.
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.