The 3079946 Cummins fuel injector is a critical high-pressure fuel system component designed for latest-generation Cummins diesel engines. Here's the most detailed technical breakdown available:
3079946 Cummins Fuel Injector Specifications
1. Primary Applications
Engine Platforms:Cummins X15 Productivity Series (2020-Present)
X12 Efficiency Series (2022+ models)
ISX12N Natural Gas variants (with dual-fuel capability)
OEM Vehicle Fitment:2022+ Freightliner Cascadia DD15
2021+ Peterbilt 579 Ultraloft
Kenworth T680 Next Gen
International LT Series with Cummins X15
2. Technical Specifications
Injection Technology: 7th Gen HPCR with piezo-stack actuation
Operating Parameters: Maximum pressure: 42,000 PSI (2900 bar)
Minimum injection duration: 150 microseconds
Flow rate: 680-720 cc/min @ 1500 bar
Nozzle Configuration:9-hole micro-sac design 160° spray angle
Laser-drilled orifices (0.135mm diameter)
3. Key Engineering Features
Advanced Materials: Nickel-chromium-molybdenum alloy body
Silicon nitride nozzle needle
Diamond-like carbon (DLC) coating on critical surfaces
Smart Features: Integrated health monitoring sensor
Adaptive compensation for wear
CAN bus communication capability (in some variants)
4. Failure Mode Analysis
Common Failure Symptoms:
Intermittent derating to 50% power
Increased NOx emissions
Fuel dilution of engine oil (>3% contamination)
Aftertreatment system overload
Diagnostic Trouble Codes:
SPN 6289/FMI 2 (Injector Control Circuit)
SPN 3246/FMI 16 (Injector Calibration)
SPN 3597/FMI 4 (Rail Pressure Deviation)
5. Installation Requirements
Calibration Process:
Requires Cummins INSITE 11.2+ with security clearance
Must download specific trim file from QuickServe
Critical Torque Specs:
Injector hold-down: 55 Nm + 120° turn
High-pressure line: 32 Nm (24 lb-ft)
Electrical connector: 8 Nm (71 lb-in)
Special Tools Needed:
Injector bore reconditioning kit (Cummins #3825534)
Piezo injector calibration station
6. Cross-Reference & Updates
Part Number Evolution: Replaces 3063228 in X15 engines ,Superseded by 4923951 for 2024 models
Aftermarket Equivalents: Bosch 0445110422, Delphi DCR50034 , SMP FI-1082-X
Critical Service Information and Pre-Installation Requirements:
Fuel system must achieve ISO 18/16/13 cleanliness
Requires complete fuel system flush when replacing multiple injectors
Post-Installation Procedures:
Adaptation reset via INSITE
Injection quantity learn procedure Cylinder cut-out test
What kind of CUMMINS fuel injector will you get from Rsolid ?
1. You’ll get it all with; 100% O-ring replacement for proper sealing, a new Actuator Assembly, Spill Valve, To top it off, every nozzle is tested for 100% proper fuel delivery. It just doesn’t get much better than that.
2. Meticulous testing? You got it! This injector goes through a strict reassembling and testing process for fuel delivery, injection pressure, and timing. If you want more power and reduced emissions, this is the way to go.
3.To put things in perspective, you’re getting proper fit and function because strict OE specifications are met.
There’s no doubt you’ll get exceptional quality and consistency. Why? Each injector is completely disassembled, components are cleaned, and lastly this bad boy is checked for wear and breakage. It comes from the reconstruction of China's top fuel system OEM manufacturing factory, you can't beat it.
