Description
Product Overview
The plunger pair is the core precision component of the mechanical fuel injection pump that generates high-pressure fuel. The cam drives the plunger to reciprocate and slide, controlling the intake, compression, and return oil cycle through the oil holes, precisely regulating the single-shot fuel supply volume. Under long-term working conditions in construction sites, mining areas, where the diesel is highly hot and heavy, and contains impurities, the outer wall of the plunger gets scratched and the sealing gap becomes larger. This can lead to oil pressure attenuation, imbalance in fuel injection volume, significant decline in engine power, and excessive black smoke. This product features an integrated precision plunger, which undergoes comprehensive testing for high-pressure sealing and fuel supply uniformity upon leaving the factory. The dimensions are standardized, and the plunger can be directly replaced for disassembly and assembly. It is suitable for maintenance of heavy-duty trucks, agricultural machinery, and small construction machinery with inline fuel injection pumps.
Unique core advantages of this product
Segmented stepped integrated plunger rod, multi-level limit sliding without deviation
The plunger rod adopts a multi-segment stepped integrated design. The multi-level ring-shaped positioning grooves ensure stable coaxiality during reciprocating motion within the pump barrel. It does not deform or wear unevenly under long-term vibration operations, ensuring a constant fuel supply stroke and smaller differences in fuel injection volume for each cylinder.
Precise side-side oil flow control holes, smooth response for return oil control
A standard oil flow control hole is set in the middle section of the plunger. The hole position size is precise, and the timing for cutting off the fuel supply is uniform. Under high and low load conditions, the oil quantity adjustment is linear and smooth, eliminating problems such as insufficient acceleration power and large speed difference in power.
Overall nitrided hardened alloy steel, wear-resistant and resistant to high pressure, less prone to scratching and internal leakage
The entire plunger is processed from high-hardness alloy steel. The surface is nitrided hardened + mirror finish grinding. The micro-micron-level gap between the plunger and the pump barrel ensures that it is well-matched under long-term high-pressure diesel and impurity erosion, and is less likely to produce scratches or deformation, eliminating internal pressure leakage and pressure drop.
Integrated limit positioning step at the end, precise assembly and positioning without grinding
The integrated limit step at the end of the plunger ensures automatic positioning when inserted into the oil pump pump barrel. The assembly depth is standardized, and there will be no abnormal fuel supply due to excessive or insufficient assembly depth, significantly reducing maintenance and adjustment time.
No burrs and micro-holes for processing, oil channels less likely to accumulate carbon and get stuck
The inner wall of the oil flow control holes is mirror polished without processing burrs. Diesel gums and fine impurities are less likely to adhere and accumulate, reducing plunger sticking and oil pump fuel supply interruption faults, and extending the overall service life of the oil pump. Applicable scenarios
This product is suitable for heavy-duty freight trucks, agricultural tractors, wheeled loaders, fixed diesel generator sets with mechanical direct injection fuel supply systems. It is applicable to mining areas, construction sites, for 24-hour full-load operation under high temperature and high dust conditions of mechanical diesel engines. It is suitable for major overhaul of fuel injection pumps of heavy-duty diesel engines in machinery.
Product Basic Parameters
Product Name: Fuel Injection Pump Piston Pair
Part Number: 090150-3050
Main Material: Integral Nitrided Hardened Alloy Steel
Structural Features: Segmented stepped piston rod, side drainage oil return holes, tail end positioning step, multi-stage annular sealing groove
Application Conditions: 24-hour continuous full-load operation, long-term high-temperature in engine compartment, outdoor high-dust heavy-duty mechanical diesel engine fuel injection pump
Product Status: New precision piston pair, factory completed with full calibration and testing of clearance, high-pressure sealingity, and fuel supply stroke
Packaging: Separately packaged in transparent protective tubes, with protective plugs added to 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.
