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4250-JS for Navistar 9.3L DT570 2004-2005 Injectors
Key Information
Part Number: 1842226C91, 1842579C91, 1842579C92, 1842579C93, 1842579C94, 1842579C95, 4250-JS, 5010659R91, 5010659R92, 6925-PP, AP66879, AP66979, DE009, FSR1842579
Engine Make: Navistar
Inspection Report: Yes
Warranty: 17 Months
Supply Ability: In stock
Payment Way: Paypal, Western Union, Visa, Mastercard, T/T
Details: One model in a neutral box or specific box required by clients.
| Feature | Advantage |
|---|---|
| Integrated High-Pressure Pumping | No need for a separate high-pressure fuel pump (simpler system). |
| Precision ECM Control | Optimizes injection timing and duration for better fuel efficiency. |
| High Injection Pressure (Up to 5,000 psi) | Improves fuel atomization for cleaner combustion and lower emissions. |
| Compact Design | Takes up less space compared to common-rail or pump-line-nozzle systems. |
| Reliable Mechanical Operation | Fewer moving parts than HEUI (Hydraulic Electronic Unit Injector) systems. |
| Easier Diagnostics | Faults trigger specific ECM codes (like JS 4250) for quicker troubleshooting. |
Comparison to Other Injector Types:
-
EUI vs. HEUI: EUI doesn’t rely on engine oil pressure (unlike HEUI), reducing oil contamination risks.
-
EUI vs. Common Rail: Simpler design but slightly less precise than modern common-rail systems.
Common Issues to Watch For:
-
Solenoid failure (causes misfires or no-start).
-
Clogged nozzle (due to poor fuel filtration).
-
Leaking check valve (leads to low pressure and poor combustion).
Conclusion:
The DT570’s EUI system is a robust, mechanically simple design that balances performance and reliability. While not as advanced as common-rail systems, its direct high-pressure generation and ECM-controlled solenoid make it efficient for its era.
| Parameter | Specification |
|---|---|
| Engine Model | Navistar DT570 (9.3L) |
| Years | 2004 - 2005 |
| Injector Type | Electronic Unit Injector (EUI) |
| Operating Pressure | 3,000 - 5,000 psi (207 - 345 bar) |
| Voltage Supply | 12V (Solenoid-Controlled) |
| Injector Resistance | 0.5 - 2.0 Ω (Check OEM specs for exact value) |
| Flow Rate | ~200 - 250 mm³/stroke (varies by calibration) |
| Nozzle Type | Multi-hole, high-pressure diesel nozzle |
| Torque Spec (Installation) | 35 - 45 lb-ft (47 - 61 Nm) (Confirm with service manual) |
| Common Failure Codes | JS (4250) – Injector circuit/performance issue |
| Compatible Fuel | Ultra-Low Sulfur Diesel (ULSD) recommended |
