0445120400 Diesel Fuel Injector 0445 120400 Common Rail Injector Assy T417829 for Per-kins for Cater-pillar

This heavy-duty, electronically controlled high-pressure common-rail fuel injector assembly (Part ID: 0445120400 / 0 445 120 400; common OE cross-references include 5308116, 5308116-NX, 0986435622, 0445120399, etc.) is precision-engineered for the ISDe 6.7L / ISBe 6.7L / QSB 6.7L inline-six diesel engine platforms. It is widely installed in medium-to-heavy-duty trucks, city buses, concrete mixer trucks, and large specialized machinery. As the core actuator for controlling ultra-fine diesel atomization and injection pulse timing within the electronic common-rail system, it is tasked with rapidly breaking down high-pressure diesel into micron-sized particles in response to microsecond-level electrical signals, ensuring thorough mixing with intake air for optimal combustion.

Manufactured to standards featuring "micron-level fit tolerances" and "millisecond-level rapid response," the internal control valve spool and needle valve assembly utilize aerospace-grade, hardened special alloy steel. These components undergo ultra-high-precision geometric grinding and low-friction polishing, finished with a dense, highly wear-resistant hardened coating that effectively prevents internal scratching and pressure-loss-related sticking caused by diesel impurities. Upon installation, drivers and maintenance technicians will notice a distinct improvement: cold starts are crisp and swift, and severe vibrations during low-speed idling are eliminated. Whether climbing steep slopes, towing heavy loads, or cruising at high speeds, the throttle response is tight and precise, offering smooth acceleration and sustained power delivery, alongside significantly reduced black smoke emissions—resulting in satisfying fuel efficiency and a smooth, responsive driving experience.

Product Advantages

Standardized smart manufacturing and quality control directly from the source factory. Cost-Effective Direct Sourcing: Eliminates intermediary markups and addresses issues common to the distribution chain—such as cumulative tolerance stack-up, uneven cylinder fuel delivery, and high-pressure leakage risks—thereby effectively reducing procurement expenses. Leveraging standardized production bases for end-to-end precision control ensures highly consistent fuel delivery volumes and injection pressures across all cylinders, providing reliable power for vehicle operations while simultaneously cutting maintenance budgets.

Rigorous Quality Control via Ultra-High-Pressure Digital Dynamic Testing: Mitigates problems associated with low-quality parts—such as response lag, pressure-relief valve sticking (causing engine misfires and vibration), and the wasted time and money spent on repeated installation and adjustment. Every injection component undergoes automated testing before leaving the factory; flow rates and sealing integrity are precisely calibrated across various pressure ranges under simulated real-world conditions (high temperature and ultra-high pressure). This ensures "ready-to-install" performance, drastically saving time and costs associated with equipment installation and tuning.

Rapid Response via Large-Scale Warehousing and Immediate Stock Availability: Addresses the critical needs of high-utilization vehicles (used for daily commuting or commercial transport) by preventing costly delays, contract penalties, and lost productivity caused by fuel system failures and vehicle breakdowns. Warehousing centers maintain ample stock of popular specifications year-round; orders are prioritized for packing and dispatch within 24–48 hours of confirmation. This significantly shortens logistics cycles, helping fleets and owners quickly restore vehicle availability and avoid losses associated with downtime.

Specialized Quenched Alloy Needle Valves with Wear-Resistant Coatings: Tackles premature wear and valve sticking caused by regional variations in diesel lubricity and sulfur content. Core valve components utilize high-strength, specialized bearing steel and undergo surface anti-corrosion hardening treatments. These measures vastly enhance fatigue and wear resistance, ensuring stable performance even under harsh environments and prolonged, high-load operation, thereby avoiding the extra expenses associated with frequent repairs.

Specifications

Application Scenarios

Intercity medium/heavy-duty truck freight and long-haul logistics: Medium-duty trucks and transport vehicles frequently operate on intercity trunk routes, often maintaining full-load cruising and continuous hill-climbing states for extended periods. When drivers notice sluggish acceleration, a lack of power in high gears, or a significant increase in fuel consumption, maintenance personnel can promptly install a full set of these high-precision common rail injectors. After installation, fuel injection pressure builds up rapidly and remains stable; acceleration under heavy loads is robust and smooth, ensuring freight tasks are completed on time and efficiently.

Construction sites and medium-duty machinery operations: Medium-sized excavators and loaders operating at earthwork sites face challenges such as heavy dust and high operational stress. When equipment experiences slow starting, severe idling vibration, or stalling under high loads, maintenance teams install this electronically controlled fuel injection assembly. Precise fuel atomization allows the engine to deliver high torque instantly at low RPMs, ensuring smooth performance during frequent stop-start cycles and heavy-load operations, thereby keeping the project on schedule.

Q&A

Q: Can the product be used immediately after installation, or does a correction code need to be entered?
A: Each fuel injector is assigned a unique flow correction code (IMA/QR code) during factory testing. We recommend using a diagnostic tool to program this code into the engine control unit (ECU) after installation to achieve optimal fuel efficiency and smooth operation.

Q: What are the stock levels and shipping times for bulk orders?
A: We operate our own factory and large-scale warehouses, maintaining substantial, year-round stock of this model. Standard orders are packed and shipped within 24–48 hours, while bulk orders can be quickly scheduled for production.

Q: How are product quality and performance ensured before shipment?
A: All fuel injectors undergo assembly in a Class 100 cleanroom and 100% bench testing across all operating conditions. Tests cover critical metrics such as sealing integrity, pre-injection volume, full-load injection volume, and fuel return volume; our rigorous standards ensure that every unit shipped is of premium quality.

Q: What is the warranty period, and how is after-sales support handled?
A: We offer a 12-month warranty. If a performance failure occurs due to non-human factors within the warranty period, we provide rapid replacement or technical support to ensure a worry-free experience.