9. CYLINDER/PISTON MXU 550EXi/MXU500i Cylinder Check the cylinder for warpage with a straight edge and feeler gauge in the directions shown. Service Limit: 0.05 mm (0.002 in) Check the cylinder wall for wear or damage. Measure and record the cylinder I.D. at three levels in an X and Y axis. Take the maximum reading to determine the cylinder wear. TOP Service Limit: 92.1 mm (3.684 in) MIDDLE Calculate the piston-to-cylinder clearance. BOTTOM Take a maximum reading to determine the clearance. Service Limit: 0.1 mm (0.004 in) Calculate the taper and out-of-round at three levels in an X and Y axis. Take the maximum reading to determine them. Service Limit: Taper: 0.1 mm (0.004 in) Out-of-round: 0. 1 mm (0.004 in) 9-6