3349860 PT CYEFI Injector | High-Flow Diesel Fuel Injection For Cummins Engines | Precision Remanufactured

In the high-stakes world of heavy-duty diesel performance, the margin between optimal power and catastrophic failure often lies in the atomization quality of the fuel injector. The 3349860 PT CYEFI Injector is not merely a replacement part; it is a critical hydraulic component engineered to meet the rigorous demands of modern Cummins PT (Pressure-Time) fuel systems. Unlike standard injectors that simply meter fuel, this CYEFI (Cummins Electronic Fuel Injection) unit acts as the heart of the engine's combustion cycle, ensuring that fuel is delivered at the precise microsecond and pressure required for complete thermal efficiency.

For fleet managers and independent workshops across North America and Europe, the focus is shifting from simple "fitment" to "flow dynamics." This injector is designed to mitigate the common issues of incomplete combustion-such as black smoke and raw fuel dilution-by utilizing advanced nozzle geometry that optimizes the spray pattern. By restoring the hydraulic balance of your engine, the 3349860 ensures that every drop of diesel contributes to torque rather than waste.

 

🎯 Selection Logic: Why This Injector?

 

Choosing the correct injector involves more than matching a part number; it requires understanding the flow rating and cam profile compatibility.

Flow Rate Matching: The 3349860 is calibrated for specific flow rates (often associated with top-stop settings). Using an injector with the wrong flow rating can lead to lean conditions (causing piston melt) or rich conditions (washing down cylinder walls).

PT System Compatibility: This unit is specifically engineered for the Cummins PT system logic, where fuel pressure and injector timing determine the volume of fuel injected.

OEM Specification Adherence: We adhere to strict dimensional tolerances, ensuring the plunger and barrel clearance meets the micron-level requirements necessary to maintain the high-pressure seal needed for proper injection.

 

 

This injector is a direct replacement for various heavy-duty applications, primarily focusing on the robust Cummins N14 and related platforms used in North American long-haul trucks and European industrial machinery.

Primary Engine Fitment: Cummins N14 CELECT / CELECT Plus.

Vehicle Applications: Freightliner, Kenworth, Peterbilt, and Volvo heavy-duty trucks.

Industrial Use: Heavy-duty construction equipment and power generation units requiring reliable PT fuel system components.

 

 

Precision is the hallmark of the 3349860. Below are the critical operational parameters that define its performance within the common rail and PT hybrid logic.

Specification	Detail
Part Number	3349860 (Supersedes/Interchangeable with specific legacy codes)
Type	PT CYEFI (Electronic Fuel Injection) Unit Injector
Fuel Type	Diesel (EN590 / Ultra-Low Sulfur Diesel compatible)
Operating Pressure	High-Pressure PT System (Variable based on RPM/Load)
Material	Hardened Steel Alloy / Ceramic Coating (Plunger)
Certification	ISO 9001 / TS 16949 Manufacturing Standards

 

 

The architecture of the 3349860 is built to withstand the immense hydraulic forces of the PT system.

1. The Plunger and Barrel Assembly:
At the core lies a matched set of plunger and barrel, machined to sub-micron tolerances. This minimizes internal leakage (blow-by), ensuring that the pressure built up during the injection event is directed entirely into the combustion chamber, not lost back into the return line.

2. Nozzle and Spray Pattern:
The nozzle tip is engineered to resist carbon buildup-a common failure point in older injectors. The spray pattern is designed to create a fine mist, promoting rapid air-fuel mixing. In the context of the PT system, this ensures that the "Timing" aspect of Pressure-Time is met with the necessary physical atomization.

3. Solenoid/Metering Precision:
For CYEFI applications, the electronic control interface must respond instantly to the ECM (Engine Control Module). This injector features low-latency actuation, ensuring that the fuel metering valve opens and closes exactly when the camshaft profile dictates.

 

Q1: What is the difference between a standard PT injector and the 3349860 CYEFI type?
A: The CYEFI (Cummins Electronic Fuel Injection) variants are designed to work in conjunction with electronic engine management systems, offering more precise metering control compared to purely mechanical PT injectors, although they still rely on the Pressure-Time hydraulic principle.

Q2: Can I install this injector without adjusting the torque settings?
A: Absolutely not. PT injectors rely on specific torque settings (often involving an "inside torque" and "outside torque" sequence) to set the correct plunger height. Failure to adjust this will result in poor performance or injector destruction.

Q3: Does this injector come with a new nozzle tip?
A: Yes, our 3349860 injectors are remanufactured or new units that include a tested and validated nozzle tip to ensure the correct spray pattern and flow rate.

Q4: Why is my engine smoking after replacing the injectors?
A: Smoke usually indicates incorrect installation (timing), air in the fuel system, or incorrect flow ratings. Ensure the fuel system is bled properly and the injector torque settings match the engine shop manual specifications.

Q5: Is this part compatible with biodiesel blends?
A: The 3349860 is generally compatible with standard biodiesel blends (e.g., B20), provided the fuel meets ASTM specifications. However, prolonged use of high-percentage biodiesel may require more frequent maintenance intervals due to solvent properties affecting rubber seals.

 

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