Product Overview

This high-quality common rail diesel fuel injector, referencing OEM numbers 0445120029 and 3965721, is a direct replacement designed for a range of Cummins diesel engines. Manufactured to precise tolerances in Shandong, China, this injector ensures optimal fuel atomization and engine performance. We serve a global B2B client base, with extensive export experience to major markets including North America, Europe, Southeast Asia, the Middle East, and Africa. This component is ideal for fleet maintenance, repair shops, and wholesale distributors requiring reliable, cost-effective fuel system parts.

Key Features & Benefits

• Precision Engineering: Manufactured from high-grade steel to exacting OEM specifications for a perfect fit and reliable sealing.
• Enhanced Performance: Optimized for common rail systems to deliver precise fuel injection timing and volume, improving engine efficiency and reducing emissions.
• Durability & Longevity: Designed to withstand high injection pressures and harsh operating conditions, ensuring a long service life in heavy-duty applications.
• Rigorous Testing: Each injector undergoes pressure and spray pattern testing before shipment to guarantee consistent, trouble-free operation.
• Direct Replacement: A true “drop-in” replacement part, simplifying installation and minimizing vehicle downtime.

Technical Specifications

OEM Cross-Reference

This injector is a direct replacement for the following original equipment manufacturer (OEM) part numbers:

• 0445120029 (Bosch)
• 3965721 (Cummins)

Note: This is a high-quality aftermarket replacement part, not an original OEM part.

Compatibility

This fuel injector is designed for use in various Cummins diesel engines equipped with Bosch common rail fuel systems. Common applications include:

• Cummins ISB, ISBe, and QSB series engines (4-cylinder and 6-cylinder variants).
• Medium-duty trucks, buses, and agricultural equipment.
• Industrial and generator set applications using compatible Cummins platforms.

Please verify your engine model and injector code before purchasing to ensure correct fitment.

Global Supply & Distribution

We offer comprehensive global supply chain solutions for international B2B buyers:

• Worldwide Shipping: Reliable shipping via sea, air, and express courier (DHL, FedEx, UPS) to any destination.
• Major Markets Served: North America (USA, Canada, Mexico), Europe (Germany, UK, Netherlands), Asia-Pacific (Australia, Japan, Korea), Middle East (UAE, Saudi Arabia), and Africa (South Africa, Nigeria).
• Fast Delivery: Efficient logistics network ensures quick delivery to major ports (Shanghai, Qingdao, Ningbo) and industrial centers.
• Export Experience: Proven track record in international trade, with proper documentation and customs clearance support.

Quality Assurance

• Manufacturing Standards: Produced in ISO-certified facilities with strict quality control processes.
• Testing: Each injector is individually tested for spray pattern, opening pressure, and leak tightness.
• Warranty: Backed by a 4-month warranty against manufacturing defects. We stand behind the reliability of our products.

FAQ

Q1: Is this injector compatible with my 2008 Cummins ISB 6.7L engine?
A1: This injector (0445120029/3965721) is commonly used in various Cummins ISB and QSB series engines. While it fits many 6.7L and 5.9L applications, we strongly recommend checking your current injector’s part number and engine serial number to confirm compatibility, as fuel system configurations can vary by year and horsepower rating.

Q2: Do I need to replace the fuel injector hold-down bolt and copper washer?
A2: Yes, it is highly recommended to replace the injector hold-down bolt, copper washer, and any sealing O-rings with new ones during installation. These are single-use components that must be torqued to the manufacturer’s specification to ensure proper sealing and prevent fuel leaks or injector failure.

Q3: What maintenance is required after installing a new fuel injector?
A3: After installation, it is critical to prime the fuel system to remove any air before starting the engine. We also recommend using a high-quality fuel filter and ensuring the fuel rail pressure is within the engine’s specified parameters. For optimal injector life, use clean, high-quality diesel fuel and perform regular fuel system maintenance as outlined in your engine’s service manual.