The Cummins 6CT diesel engine cylinder liner (typically 8.3L, 114mm bore) is a high-grade, wear-resistant casting designed to form the combustion chamber, ensure maximum compression, and manage heat dissipation. Available as wet or dry liners, they are engineered for durability in heavy-duty, marine, and construction applications, often replacing part numbers 3800328, 3944344, or 3948095.