Description

The Cummins 6CT 8.3 Thick-Wall Liner Kit 3802403 (Long Flange) is an OEM-spec cylinder liner solution engineered for heavy-duty diesel engines requiring thick-wall, long-flange sleeves . Manufactured to precise factory tolerances, this liner kit restores correct bore geometry, heat transfer, and long-term durability in Cummins 6CT 8.3 engines . Thick-wall liners are designed for blocks that require increased rigidity and durability compared to thin-wall sleeves. The long-flange design provides enhanced top support and seating stability, helping prevent liner movement, fretting, and coolant intrusion—especially important in high-load and continuous-duty applications. Each liner is produced from high-strength alloy iron and precision-honed to support fast piston ring seating, stable oil control, and reduced friction. When paired with the correct pistons and ring sets, the 3802403 liner kit helps restore factory compression ratios and consistent combustion performance during rebuilds. This liner kit is commonly installed during 6CT 8.3 engine overhauls, block reconditioning, in-frame rebuilds, and professional remanufacturing projects . Correct liner selection is critical— verify block casting and liner type (thick-wall, long flange) before installation . Part Number & Application Notes Liner Kit Part Number: 3802403 Engine Platform: Cummins 6CT 8.3 Type: Thick-wall cylinder liner Flange: Long flange Fitment Note: Verify block casting and liner specifications prior to ordering.