Valve Stem Seal Cummins 4026791 | 402679100, CU4026791, CUM4026791, 4026660, 192119

High-Quality Valve Stem Seal for Cummins ISX and QSX Engines

The Cummins 4026791 valve stem seal is designed to provide a precise, reliable seal for the engine’s valvetrain, preventing oil from entering the combustion chamber. This essential component helps maintain correct oil balance, reduces oil consumption, and minimizes exhaust smoke, protecting your engine’s valves, guides, and combustion components from premature wear. This part is also available under the numbers: 402679100, CU4026791, CUM4026791, and 4026660.

Engineered for heavy-duty applications, this valve stem seal is manufactured from premium materials to withstand extreme temperatures and harsh operating conditions. Ensuring a proper seal on the valve stem is critical for maintaining engine efficiency and preventing costly emissions system issues down the line.

Engine Compatibility and Fitment

This valve stem seal is designed for use in heavy-duty Cummins diesel engines, specifically:

• Cummins ISX 15
• Cummins QSX 15

Key Features and Benefits

• Optimal Oil Control: Prevents oil from leaking down the valve guide into the combustion chamber, reducing oil consumption and blue exhaust smoke.
• Durable Construction: Made from high-quality elastomeric materials designed to resist heat, oil, and wear in demanding heavy-duty environments.
• Precise Fitment: Engineered to exact specifications for a reliable, leak-free seal on Cummins ISX and QSX series engines.
• Protects Valvetrain Components: Helps prevent carbon buildup on valves and guides, extending the service life of your cylinder head assembly.

Cross-Reference / Interchange Part Numbers

This part replaces / is interchangeable with the following part numbers:

• 4026791
• 402679100
• CU4026791
• CUM4026791
• 3680318
• 4026660
• 4312008
• 4356366
• 3685997
• 192119
• M-4026791
• K4026791
• 1221448
• 122-1448