7. CYLINDER/PISTON Downtown 300i ABS Measure the connecting rod small end I.D. Service Limit: 15.06 mm replace if over PISTON RING INSTALLATION Install the piston rings onto the piston. Apply engine oil to each piston ring. · Be careful not to damage the piston and piston rings during assembly. Top · All rings should be installed with the markings facing up. Second · After installing the rings, they should rotate freely without sticking. · Stagger the ring end gaps as the figure shown. Side Rail Oil Ring Side Rail Top Second 7-6