Description
Product Overview
The plunger pair is the core component of the mechanical fuel injection pump that generates high-pressure fuel. The cam drives the plunger to reciprocate and slide, and the head chamfer and side oil holes cooperate to complete the oil suction, pressure application, and return oil cycle, precisely controlling the single injection volume. Under long-term conditions such as high-temperature, heavy-load, and impure diesel erosion, the outer wall of the plunger gets scratched and the sealing gap expands, resulting in continuous decline of supply pressure, imbalance of injection volume, decline of engine power, and excessive black smoke. This product features an integrated precision plunger, which undergoes factory testing for high-pressure sealing and uniform fuel supply. The dimensions are standardized, and disassembly and assembly do not require grinding for adaptation. It is suitable for maintenance of direct injection pumps for heavy trucks, agricultural machinery, and large construction machinery.
Unique core advantages of this product
The head chamfer is adjustable, and the oil quantity adjustment is precise and linear.
The front end of the plunger is integrally formed with a standard chamfered protrusion, which precisely meshes with the oil quantity adjustment lever of the oil pump, ensuring strong synchronization during rotation, smooth and without jolts when adjusting the oil quantity under high and low loads, and balancing the fuel injection volume of each cylinder, improving the problem of weak acceleration and abnormal exhaust color.
The multi-stage stepped smooth rod body ensures stable coaxiality during reciprocating motion.
The multi-stage stepped transition plunger rod has uniform sliding contact surfaces, without skew or unilateral wear during the reciprocating motion within the pump barrel, and the supply stroke remains stable under long-term vibration operations, reducing the difference in fuel supply among cylinders, and making idling operation more stable.
The side-side flow back oil hole controls oil supply and pressure relief quickly.
The standard back oil hole is set on the rear base side, ensuring a unified cut-off of fuel supply timing, smooth oil pressure relief, avoiding sudden changes in oil pressure causing power jolts, smooth fuel circulation, and reducing gum accumulation and sticking.
The thickened rear base for bearing pressure, resistant to impact and not prone to deformation.
The widened and thickened bearing base at the rear end can withstand the high-frequency impact force of the reset spring, has sufficient bearing area, resists the impact of high-pressure fuel without bulging or deformation, and maintains a micrometer-level sealing gap between the plunger and the pump barrel for a long time, eliminating internal leakage and pressure loss.
The overall nitrided hardened alloy steel ensures wear resistance and corrosion resistance, with a long service life.
The entire plunger is processed by high-hardness alloy steel, with surface nitriding hardening + mirror finish grinding, the outer wall is smooth and wear-resistant, and diesel impurities and high-temperature erosion are not prone to scratches or abrasions, suitable for harsh operating environments with high dust. Applicable scenarios
This product is suitable for heavy-duty freight trucks, agricultural tractors, wheeled loaders, high-power stationary diesel generators with mechanical direct injection fuel supply systems. It is applicable to mining areas and construction sites for 24-hour full-load operation under high temperature and high dust conditions. It is a major overhaul for diesel engine fuel injection pumps of heavy machinery type in such environments.
Product Basic Parameters
Product Name: Fuel Injection Pump Piston Pair
Part Number: 090150-5630
Main Material: Integral Nitrided Hardened Alloy Steel
Structural Features: Head chamfered adjustment boss, multi-stage stepped piston rod, side oil return drainage holes, thickened tail pressure-bearing base
Application Conditions: 24-hour continuous full-load operation, long-term high-temperature in the engine compartment, outdoor high-dust heavy machinery diesel engine fuel injection pump
Product Status: New precision piston pair, factory completed with full calibration and testing of clearance, high-pressure sealing, and fuel supply stroke
Packaging: Separately packaged in transparent protective tubes, with protective plugs installed at both ends of the piston to isolate the sensitive sliding working surfaces from transportation impacts and scratches, supporting single-piece and batch purchase of multiple pistons, and compatible with cross-border small package logistics.
