The Cummins Inlet Valve 3921444 and Cummins Outlet Valve 3924492 are critical components of the Cummins 6CT diesel engine cylinder head assembly. The inlet valve allows the right amount of air-fuel mixture to enter the combustion chamber, while the outlet (exhaust) valve ensures smooth expulsion of gases.
Key Features:
OEM Quality: Genuine Cummins valves ensure perfect fit and sealing.
Durability: Heat-resistant alloy construction for long service life.
Applications: Designed for Cummins 6CT diesel engines, widely used in buses, trucks, and construction equipment.
Performance: Maintains proper air intake and exhaust flow for better fuel efficiency and power.
Direct Replacement: Easy installation, OEM specification guaranteed.
These engine valves are essential for smooth combustion, fuel efficiency, and reduced emissions, making them an ideal choice for fleet operators and engine rebuilders.


| Item | Details |
|---|---|
| Product | Cummins Engine Inlet & Outlet Valves |
| OEM Numbers | Inlet Valve: 3921444 / Exhaust Valve: 3924492 |
| Compatible Engine | Cummins 6CT diesel engine |
| Application | Bus engines, trucks, construction machinery, power generators |
| Material | High-strength alloy steel, heat-resistant |
| Function | Controls intake air-fuel mixture and exhaust gas release |
| Installation | Direct replacement, OEM standard fit |
| Package | Standard Cummins packaging or neutral export package |
| Engine Model | Typical Vehicle Applications |
|---|---|
| Cummins 6CT | Yutong, King Long, Higer buses; Dongfeng, Sinotruk trucks; loaders, excavators, and generator sets |