Description
Product Overview
The fuel injector is assembled at the front end of the electronic fuel injector. High-pressure fuel passes through the internal needle valve and is cut by the front micro-hole to form a fine oil mist. The electronic control unit precisely controls the injection timing and fuel quantity based on the oil pressure signal. Under the long-term working conditions of high cabin temperature and continuous impingement of impure diesel, the injection holes may get clogged, the sealing surface of the needle valve may wear out, and the clearance between the mating parts may expand. This may result in uneven atomization, engine shutdown dripping oil, imbalance in the power output of each cylinder, weak engine acceleration, excessive black smoke emissions, and a significant increase in fuel consumption. This product is an integrated precision fuel injector that has undergone high-pressure and high-flow performance testing upon leaving the factory. The size and hole positions are standardized, and disassembly and assembly do not require grinding to fit. It is suitable for the maintenance of medium and heavy-duty trucks, mining construction machinery, diesel generator sets, and common rail fuel injectors of medium and heavy-duty trucks.
Unique Core Advantages of the Single Product
Multi-level stepped and extended guide rods, no unilateral wear during reciprocating motion
The rod body adopts multi-segment circular arc smooth stepped transition, with a mirror finish on the outer wall, which is precisely guided in the internal of the fuel injector shell and has no unilateral inclination wear. It maintains a micrometer-level sealing gap between the needle valve and the valve seat for a long time, preventing high-pressure fuel leakage and depressurization, and stabilizing the common rail system oil pressure.
The middle part is widened with an integrated limit flange, ensuring a secure and tight assembly seal
The middle section of the valve body is widened with a limit step for assembly, which precisely fits the installation position of the fuel injector shell. After being combined with a sealing gasket, multiple layers of barriers prevent high-pressure fuel leakage and avoid oil pressure loss, ensuring the stability of the injection pressure throughout the process.
The sharp multi-micro-hole mirror-polished nozzle has fine atomization and complete combustion
The inner wall of the front injection micro-hole is finely ground without burrs, and the high-pressure fuel is uniformly cut into fine oil mist. The gas and oil in the cylinder are fully mixed, significantly reducing the accumulation of carbon deposits in the cylinder and lowering the black smoke emissions. It improves the fuel utilization efficiency.
The outer wall is permanently engraved with the part number, making it easy to verify the inventory without misplacing the parts.
The outer side of the flange is etched with the DLLA145P639 model code, which is resistant to diesel soaking, wiping, and wear. The maintenance inventory, parts matching, and logistics are clear and intuitive, reducing the confusion caused by model mismatches and reducing rework and losses.
The entire set of fuel injectors is made of high-hardness alloy steel that is nitrogenized and hardened. The surface is treated with nitrogenization hardening, and the sealing surface of the needle valve is wear-resistant and scratch-resistant. It has a longer service life in harsh conditions such as mining areas and construction sites with high dust and impure diesel, reducing the frequency of replacement and maintenance costs.
Application Scenarios
Suitable for medium and heavy-duty long-distance freight trucks, large mining excavators, heavy-duty wheel loaders, and high-power fixed diesel generator sets equipped with electronic common rail fuel supply systems. It is applicable to heavy-duty electric control diesel engines with 24-hour continuous full-load operation, long-term high cabin temperature, and high-dust outdoor environments for fuel injector major repairs.
Product Basic Parameters
Product Name: Electronic Common Rail Fuel Injector Assembly
Part Number: DLLA145P639
Main Material: Overall Nitrided and Hardened Alloy Steel
Structural Features: Multi-level stepped and extended guide rods, middle part widened limit flange, front multi-micro-hole atomization end, outer wall engraved with part number
Application Conditions: 24-hour continuous full-load operation, long-term high cabin temperature, outdoor high-dust heavy-duty electric control common rail diesel engine fuel injector
Product Status: New precision fuel injector, completed with full calibration and testing for atomization effect, high-pressure sealing, and injection flow upon leaving the factory
Packaging: Each unit is separately packaged in an independent transparent hard protective tube, with plastic plugs at both ends for protection against磕碰划伤 the front micro-holes during transportation， supporting single-piece， multi-box， and bulk purchasing in boxes， and suitable for cross-border small package / full-box logistics.
