Product Overview

This high-precision diesel fuel injection pump head rotor is a direct replacement for Isuzu 4JB1 and 4BC2 engine applications. Manufactured to meet OE specifications, part number 146402-0820 (also cross-referenced as 9 461 612 320) ensures reliable fuel delivery and optimal engine performance. We ship globally to major industrial centers in North America, Europe, Asia-Pacific, the Middle East, and Africa, supporting B2B clients with consistent supply and fast delivery.

Key Features & Benefits

• Precision Engineering: Manufactured with tight tolerances to ensure accurate fuel metering and injection timing.
• Durable Construction: Made from high-strength, wear-resistant materials to withstand high-pressure operation and extend service life.
• Direct Fitment: Designed as a direct OE replacement for Isuzu 4JB1 and 4BC2 diesel engines, minimizing installation downtime.
• Reliable Performance: Restores fuel injection pump efficiency, improving engine start-up, power output, and fuel economy.
• Rigorous Testing: Each unit undergoes quality checks for dimensional accuracy and hydraulic performance before shipment.

Technical Specifications

OEM Cross-Reference

• Primary OE Number: 146402-0820
• Alternative Number: 9 461 612 320

These numbers correspond to the head rotor assembly for Zexel/Denso-type injection pumps used in Isuzu 4JB1 and 4BC2 series engines. Always verify your existing part number before ordering.

Compatibility

• Engine Models: Isuzu 4JB1, Isuzu 4BC2
• Vehicle Applications: Isuzu NPR, NKR, NHR, Elf trucks, and other light-duty commercial vehicles equipped with these engines.
• Year Range: Compatible with 1980s through 2000s model years typically featuring these naturally aspirated and turbocharged diesel engines.

Global Supply & Distribution

We maintain a reliable supply chain capable of shipping 1000+ pieces per month to meet B2B demands. Our logistics network supports fast delivery via DHL, TNT, UPS, EMS, and FEDEX to major ports and industrial zones worldwide.

• North America: Los Angeles, Chicago, Houston, Toronto
• Europe: Rotterdam, Hamburg, London, Dubai (Jebel Ali)
• Asia-Pacific: Singapore, Shanghai, Tokyo, Sydney
• Middle East & Africa: Dubai, Jeddah, Lagos, Nairobi

We offer flexible packaging options including OEM packing, neutral packing, or custom requests to suit your distribution requirements.

Quality Assurance

• Manufacturing Standards: Produced in ISO-compliant facilities in Shandong, China.
• Testing: Each head rotor is inspected for dimensional accuracy, surface finish, and hydraulic sealing performance.
• Warranty: 6-month warranty against manufacturing defects under normal operating conditions.
• Support: 24-hour customer service for technical inquiries and order support.

FAQ

Q: How do I confirm this head rotor fits my Isuzu 4JB1 injection pump?
A: Verify your pump’s model number and look for the existing part number stamped on the head rotor. This unit replaces OE numbers 146402-0820 and 9 461 612 320. It is designed for Zexel/Denso-type inline pumps on 4JB1 and 4BC2 engines. If unsure, contact us with your pump’s identification plate details.

Q: What is the recommended installation procedure for a head rotor?
A: Installation should be performed by a qualified diesel technician. The head rotor is a precision component; ensure the pump housing and all mating surfaces are clean. Follow the manufacturer’s service manual for proper timing and torque specifications. We recommend replacing the seal kit and checking the pump’s internal clearances during installation.

Q: What maintenance is required for the injection pump after replacing the head rotor?
A: After installation, the injection pump should be bench-tested for correct delivery volume and timing. On-vehicle, prime the fuel system, bleed air from the lines, and check for leaks. Regularly use clean, high-quality diesel fuel and replace fuel filters per the engine manufacturer’s schedule to maximize the new head rotor’s lifespan.