Product Overview

The Cummins Valve Stem Seal 3948578 (also compatible with part numbers 5253590 and 5448124) is a precision-engineered sealing component designed specifically for Cummins C8.3 and L8.9 series diesel engines. This critical engine part prevents excessive oil from entering the combustion chamber while allowing just enough lubrication for the valve stem and guide. Manufactured from high-quality fluoroelastomer materials, it maintains sealing integrity under extreme temperatures and continuous engine operation. The advanced design ensures proper oil control, reducing oil consumption and minimizing exhaust smoke. These genuine-quality valve stem seals provide reliable performance, extend engine life, and help maintain optimal engine efficiency in heavy-duty applications.

Specifications