CYEFI 4326780 QSK60 Injector – Precision Fuel Delivery For High-Horsepower Common Rail Systems

The CYEFI 4326780 fuel injector is an advanced replacement component tailored for the Cummins QSK60 engine family, which operates within the Modular Common Rail System (MCRS) architecture. Engineered to endure the extreme thermal and mechanical stresses of continuous heavy-duty cycles, this injector ensures precise fuel metering and atomization under peak load conditions. For workshops and fleet operators, the 4326780 addresses the critical need for consistent injection timing and spray pattern integrity, directly influencing combustion stability, exhaust profiles, and overall power retention in demanding applications such as mining haulage, marine propulsion, and industrial power generation .

Parameter	Specification
Brand / Manufacturer	CYEFI (Chongyou Hi-Tech)
Product Type	Diesel Common Rail Fuel Injector
Part Number / OEM	4326780 (Interchangeable with 4010025, 4088427)
Engine Platform	Cummins QSK45, QSK60, QSK78
Injection System	Modular Common Rail System (MCRS)
ECM Compatibility	CM850, CM2150, CM2250, CM2350 variants
Fitment Quantity	16 units per QSK60 engine
Construction	Tungsten-treated steel alloy, high-grade seals

The CYEFI 4326780 injector is specifically calibrated for the QSK60 power unit, a 60-liter high-displacement engine renowned for its durability in continuous-duty roles. This injector is a direct-fit solution for equipment where operational downtime translates directly to revenue loss, including Komatsu and Caterpillar mining trucks, large-scale drilling rigs, marine auxiliary and propulsion systems, and prime/standby generator sets. It is also compatible with QSK45 and QSK78 platforms, making it a versatile stock-keeping unit for distributors serving diverse heavy industries . The injector operates as part of the high-pressure MCRS, managing rail pressures capable of exceeding 1,800 bar to produce the fine atomization necessary for efficient combustion in large-bore diesel engines .

Successful installation of the 4326780 injector demands strict adherence to high-pressure fuel system hygiene and electronic calibration. Technicians must meticulously inspect the injector bore, replace all high-pressure seals and copper washers, and ensure fuel passages are free of microscopic contaminants that can compromise the precision valve operation. Beyond physical installation, a critical step involves using Cummins INSITE™ software to input the unique trim code or injector classification number into the Engine Control Module (ECM). This process, often referred to as "injector coding," allows the CM850 or CM2150 controller to compensate for minute flow variations, ensuring balanced fuel delivery across all cylinders and preventing rough idle or excessive smoke .

For diesel repair specialists, the CYEFI 4326780 represents a high-value solution for restoring QSK60 engine performance without the premium cost of OEM-only parts. Injector degradation in high-hour engines typically manifests as hard starting, erratic idle, increased black smoke under acceleration, or a noticeable drop in torque. Given the MCRS architecture's reliance on precise hydraulic pressure, a failing 4326780 can also cause "cylinder contribution" faults during diagnostic balance tests. Selecting a professionally manufactured injector like the CYEFI unit ensures that the replacement matches the original flow rates, preserving the engine's fuel mapping and reducing the risk of consequential damage to the high-pressure pump or fuel rail .

Q1: What are the primary cross-reference part numbers for the 4326780 injector?
A: The 4326780 commonly crosses with 4010025, 4088427, 4088428, and 4001813. Always cross-check against the engine's ESN to confirm the correct build list revision .

Q2: What are the signs of a failing injector in a QSK60?
A: Key indicators include visible black or white smoke during load changes, poor fuel economy, knocking or irregular combustion noise, and failed cylinder balance tests on the ECM diagnostic screen.

Q3: Is ECM coding necessary after replacing the 4326780?
A: Yes. Entering the specific injector trim code via INSITE™ is mandatory to optimize combustion and ensure smooth operation across the engine's operating range .

Q4: Does the CYEFI 4326780 meet OEM performance standards?
A: CYEFI is a professional manufacturer holding Cummins PT fuel system patent licenses and operates under ISO standards, producing components that match the original equipment's hydraulic specifications .

Q5: Is this injector compatible with QSK45 and QSK78 engines?
A: Yes, the 4326780 is listed for use across the QSK45, QSK60, and QSK78 engine families, providing inventory flexibility for parts distributors .

 

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