An improved top ring has been released for Caterpillar C-15 (Serial No. 9NZ1-Up) and C-15 (Serial No. BXS1-Up, MXS1-Up and NXS1-Up) engines that are used in high load applications.
The improved top piston ring is made from stronger materials. The stronger materials have a proven robustness in order to withstand fatigue from high cycles, Caterpillar says.
For the stated engines, replace the 237-0194 top piston ring with the 247-6130 top ring piston on the piston prior to assembly. High load applications include coal and logging applications with a gross vehicle weight greater than 140,000 lbs.
