7. CYLINDER/PISTON DOWNTOWN 125i Cylinder Check the cylinder for warpage with a straight edge and feeler gauge in the directions shown. Se 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 MIDDLE BOTTOM Measure the piston-to-cylinder clearance. Take a maximum reading to determine the clearance. Measure the taper and out-of-round at three levels in an X and Y axis. Take the maximum reading to determine them. Measure the connecting rod small end I.D. vi Measure the connecting rod-to-piston pin clearance. 7-7