Description
Product Overview
The fuel injector is assembled at the front end of the mechanical fuel injector. Under high pressure, the fuel pushes the internal needle valve to open, and through the micro holes on the end face, a fine oil mist is formed, completing the fuel injection work for the cylinder. Under long-term conditions such as high-temperature and heavy-load farming, construction sites, and diesel fuel contaminated with impurities, the injector holes may get clogged, the sealing surface of the needle valve may wear out, and the sealing gap may expand. This will result in uneven atomization, engine shutdown dripping oil, imbalance in 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 undergoes high-pressure holding and full-condition flow balance testing upon leaving the factory. Its size specifications are standardized, and disassembly and assembly do not require grinding for adaptation. It is suitable for maintenance and repair of fuel injectors for agricultural machinery, light trucks, small-scale construction machinery, and other diesel engines.
Unique Core Advantages of the Single Product
Straight and elongated mirror-guided rod, no unilateral wear during reciprocating sliding
The outer wall of the entire straight and long rod is finely ground to a mirror finish. It is stable in the reciprocating guidance within the fuel injector housing without any inclination unilateral wear. It maintains a micrometer-level sealing gap between the needle valve and the valve seat for a long time, preventing internal leakage of high-pressure fuel and pressure relief, and stabilizing the fuel injection output pressure.
Double-hole symmetrical spray structure at the end face, uniform atomization and complete combustion
The spray end face has two uniform and symmetrical micro-holes distributed evenly. The hole walls are mirror-polished without burrs. The high-pressure fuel is evenly divided into fine oil mist, achieving sufficient gas-oil mixture in the cylinder, significantly reducing carbon deposits in the cylinder, lowering exhaust black smoke emissions, and improving fuel utilization efficiency.
The middle part has an integrated widened limit flange, with a widened limit step in the valve body. During assembly, it precisely fits the installation position of the fuel injector housing, and after being combined with a sealing copper pad, multiple layers of barriers prevent high-pressure fuel leakage and avoid pressure loss, ensuring the fuel injection pressure remains stable throughout the process.
The outer wall is permanently engraved with the part number for easy verification during inventory and replenishment.
The side wall of the flange is etched with the DLLA158PN312 model code, resistant to diesel soaking, wiping wear, and facilitating clear matching and intuitive identification for maintenance, spare parts, and inventory, reducing the cost of rework due to model confusion.
The entire fuel injector is made of nitrogenized hardened alloy steel, which is wear-resistant and suitable for harsh conditions. The entire fuel injector is processed by high-hardness alloy steel, with a surface nitrogenized hardening treatment. The sealing surfaces of the needle valve and valve seat are wear-resistant and scratch-resistant. It has a longer service life in agricultural, construction, and high-pollution diesel engine environments and reduces the frequency of disassembly and replacement.
Application Scenarios
Suitable for agricultural tractors with mechanical direct injection fuel supply systems, light-duty diesel trucks, small wheeled loaders, fixed diesel generator sets, and diesel engine fuel injectors of small-scale mechanical diesel engines used in farming operations, light-load construction sites, and outdoor environments with high temperatures, low temperatures, and high dust. It is suitable for major overhauls of fuel injectors for these diesel engines.
Product Basic Parameters
Product Name: Mechanical Direct Injection Fuel Injector Assembly
Part Number: DLLA158PN312
Main Material: Overall nitrogenized hardened alloy steel
Structural Feature: Straight and elongated mirror-guided rod, end face double-hole symmetrical spray surface, middle part widened limit flange, outer wall engraved with model code
Application Conditions: Continuous light to heavy loads, alternating hot and cold engine compartments, outdoor high-pollution diesel engine fuel injectors
Product Status: New precision fuel injector, completed with full calibration and testing for atomization effect, high-pressure sealing, and fuel injection opening pressure upon leaving the factory
Packaging: Each unit is separately packaged in a transparent hard protective tube, with plastic plugs at both ends for protection against knocks and scratches at the front micro-holes. It supports single-piece, multi-box, and bulk purchasing in cartons, suitable for cross-border small package logistics.
