Diesel Fuel Injection Pump 0402066721/3931256 ,Application: Cummins 6CTAA 8.3L Diesel Engine
1.Product Name: Mechanical pump
2.Model No.:0402066721/3931256
3.Origin: made-in-China
4.Weight: 25KG
5.Size:50*19*45cm
6.Delivery Time: 3-5 days
7.Payment Methods:T/T,Western union,PayPal,ALIBABA,BANK
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Product Introduction
Diesel Fuel Injection Pump (P/N: 0402066721 / 3931256) for Cummins 6CTAA 8.3L Engine - Technical Overview
This fuel injection pump is a critical component for the Cummins 6CTAA 8.3L diesel engine, ensuring precise high-pressure fuel delivery to the injectors for optimal combustion efficiency. Below is a detailed breakdown of its specifications, applications, and maintenance guidelines.
Key Specifications
Part Numbers:
0402066721 (Common aftermarket/replacement number)
3931256 (OEM/original equipment reference)
Engine Compatibility:
Cummins 6CTAA 8.3L (Industrial, marine, and heavy-duty applications)
May also fit other Cummins C-series engines (verify before installation).
Pump Type:
Injection System: Mechanical or Electronic (depending on engine variant)
Design: Inline plunger pump or rotary distributor pump (confirm model-specific design).
Operating Pressure: 1,200–1,800 bar (high-pressure fuel delivery for direct injection).
Flow Rate: Engine-specific; typically optimized for 6CTAA 8.3L power output.
Material: Hardened steel internals, corrosion-resistant housing.
Technical Specifications Table
Applications
This injection pump is commonly found in:
Heavy-Duty Trucks (e.g., dump trucks, haulers with Cummins 6CTAA)
Industrial & Construction Equipment (generators, excavators, loaders)
Marine Engines (marine propulsion systems)
Agricultural Machinery (tractors, harvesters)
Symptoms of a Failing Injection Pump
Replacement & Installation Notes
Feature5263084 (Mechanical)Modern E-Pumps
Control Accuracy ±3% ±0.5%
MTBF 15,000 hours 25,000 hours
Emission Compliance China II-III China VI+
Troubleshooting Guide
Installation Steps:
Depressurize the System – Disconnect the battery and relieve fuel pressure.
Remove Old Pump – Disconnect fuel lines, throttle linkage, and mounting bolts.
Timing Alignment – Ensure proper pump-to-engine timing (critical for performance).
Torque Specifications – Tighten mounting bolts to 20–30 Nm (varies by model).
Bleed Air from System – Prime the pump and bleed fuel lines before starting.
Maintenance Tips:
Use clean, high-quality diesel to prevent pump wear.
Replace fuel filters regularly (every 15,000–20,000 km).
Inspect for leaks or unusual noises during operation.
Cross-Reference Data
Equivalent Pumps:
Delphi HFP-937 (requires adapter)
Denso 950-0107 (flow +5%)
Superseded Parts:
Bosch 0400866187 (previous generation)
Bosch 0400866189 (higher flow version)
Maintenance Schedule
Your doubts
Abosede
Customer feedback
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