Description
Product Overview
The plunger pair is the core precision component of the mechanical fuel injection pump that generates high-pressure fuel. It is driven by the cam to move the plunger back and forth, and through the oil holes, it completes the suction, pressure, and return oil cycles, precisely controlling the single injection volume. Under long-term mining areas, construction sites, 24-hour high-temperature heavy-load, and impure diesel erosion conditions, the outer wall of the plunger will be worn and scratched, and the sealing gap will increase. This will result in continuous oil pressure attenuation, inconsistent injection volume, significant decline in engine power, and excessive black smoke. This product features an integrated precision plunger, which is completed with high-pressure sealing and uniform oil supply testing at the factory. The dimensions are standardized, and the plunger can be directly replaced for disassembly and assembly, suitable for maintenance of heavy-duty trucks, agricultural machinery, and large construction machinery inline fuel injection pumps.
Unique core advantages of this product
Multi-stage stepped plunger rod, stable coaxiality during reciprocating motion
The plunger adopts a multi-stage stepped integrated structure, with smooth transitions between sections, and there is no offset or unilateral wear during the reciprocating motion within the pump barrel. The supply stroke remains constant during long-term bumpy operations, reducing the difference in fuel injection volume among cylinders, and improving the imbalance of power.
Middle section limit positioning ring, precise control of assembly depth
The standard positioning ring is matched at the middle section of the plunger and automatically limits and positions when installed in the oil pump pump barrel. The assembly depth is uniform, eliminating the need for repeated adjustment of the stroke, significantly reducing the maintenance and assembly time of the oil pump, and avoiding assembly deviations that cause abnormal oil supply.
Thickened rear end pressure-bearing base, resistant to high-pressure impact without deformation
The widened and thickened rear end pressure-bearing base receives the continuous impact force from the spring, has a larger bearing area, and is less likely to deform or bulge under the impact of high-pressure fuel. It maintains the precise gap between the plunger and the pump barrel for a long time, eliminating internal oil pressure leakage and pressure loss, and preventing abnormal internal oil pressure fluctuations.
Overall nitrided hardened alloy steel, wear-resistant and corrosion-resistant, with a long service life
The entire plunger is processed with high-hardness alloy steel, with surface nitriding hardening + mirror finish grinding treatment. The outer wall of the plunger is smooth and wear-resistant, and diesel impurities and high-temperature erosion are less likely to cause scratches and damages. It is suitable for harsh working conditions with high dust.
Precise oil passage processing without burrs, less likely to accumulate carbon and get stuck
The inner wall of the plunger control oil hole is mirror polished without processing burrs. Diesel gums and tiny impurities are difficult to adhere and accumulate, reducing the frequency of plunger sticking, oil supply interruption faults, and reducing the frequent maintenance costs of the oil pump. Applicable scenarios
This product is suitable for heavy-duty freight trucks, agricultural tractors, wheeled loaders, fixed high-power diesel generators, and heavy-duty diesel engines 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 suitable for the overhaul of diesel engine fuel injection pumps of heavy machinery types.
Product Basic Parameters
Product Name: Fuel Injection Pump Piston Pair
Part Number: 090150-5290
Main Material: Integral Nitrided Hardened Alloy Steel
Structural Feature: Multi-stage stepped piston rod, middle section limit positioning ring, thickened tail bearing base, precise oil control structure
Application Conditions: 24-hour continuous full-load operation, long-term high-temperature in the engine compartment, outdoor high-dust heavy-duty 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: Independent transparent protective tube packaging, protective plugs installed at both ends of the piston, isolating the transportation from磕碰划伤 (knock and scratch) of the precise sliding working surface， supporting single-piece and batch purchase of multiple pistons， and compatible with cross-border small package logistics.
