9. CYLINDER/PISTON MXU 500 IRS Piston/Piston pin Measure the piston O.D. at the point (A) from the bottom and 90° to the piston pin hole. (A) 10 mm Service Limit: 91.9 mm (3.676 in) at (A): 10 mm Calculate the cylinder-to-piston clearance. Measure the piston pin hole. Take the maximum reading to determine the I.D.. Service Limit: 22.04 mm (0.8816 in) Measure the piston pin O.D. at piston and connecting rod sliding areas. Service Limit: 21.96 mm (0.8784 in) Measure the piston-to-piston pin clearance. Service Limit: 0.02 mm (0.001 in) 9-5