4001791 Cummins fuel injectors are critical components in diesel engines, ensuring precise fuel delivery for optimal combustion. Below are their characteristics, applications, and key information:
Precision Engineering:
Designed for high-pressure fuel delivery (up to 30,000+ psi in common-rail systems).
Tight tolerances ensure accurate fuel metering and atomization.
Durability:
Made from hardened materials (e.g., stainless steel, tungsten carbide) to withstand extreme pressures and temperatures.
Compatibility:
Tailored for specific Cummins engine series (e.g., ISX, QSB, B Series, X15).
Advanced Technologies:
Electronically Controlled: Features solenoid or piezoelectric actuators for precise timing.
Common Rail or HEUI: Depending on the engine model (e.g., HPCR for newer engines).
Emission Compliance:
Optimized to meet EPA Tier 4, Euro VI, and other emission standards by reducing unburned fuel.
Application Scenarios
On-Highway Vehicles:
Heavy-duty trucks (e.g., Cummins ISX15 in Freightliners).
Buses and RVs.
Off-Highway Equipment:
Construction machinery (excavators, bulldozers).
Agricultural tractors and harvesters.
Industrial/Generator Sets:
Backup power generators (e.g., Cummins QSK60).
Marine engines.
Military/Defense:
Used in armored vehicles and military transport due to reliability.
Key Information
Common Part Numbers:
Remanufactured: 4001791 (fits various Cummins engines).
OEM Alternatives: 5288989, 4909944 (varies by engine model).
Symptoms of Failure:
Hard starts, misfires, excessive smoke (black/white), increased fuel consumption.
Maintenance Tips:
Use ultra-low-sulfur diesel (ULSD) to prevent deposits.
Replace filters regularly to avoid clogging.
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