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 reciprocate and slide the plunger, and completes the oil suction, pressure application, and oil return cycle through the control holes, precisely controlling the fuel injection volume of a single cylinder. Under long-term mining and construction conditions where the engine is exposed to 24-hour high-temperature and heavy-load, with impurities from diesel washing the cylinder, the outer wall of the plunger gets scratched and the sealing gap expands. This can lead to continuous oil pressure attenuation, excessive difference in fuel injection volume of the six cylinders, significant decline in engine power, and excessive black smoke emissions. This product is a set of 6 plunger kits, with each individual unit having independent sealing protection. It undergoes comprehensive testing for high-pressure sealing and fuel supply uniformity upon leaving the factory. The dimensions are standardized and compatible with six-cylinder heavy-duty trucks, large-scale construction machinery, and generator sets for direct fuel injection pump maintenance.
Core advantages of individual and set products
A set of 6 units in one box, suitable for the maintenance of six-cylinder engines
The standard 6-unit packaging in the entire box allows for the replacement of all plunger units of a six-cylinder oil pump in one purchase, eliminating the need for multiple scattered purchases and facilitating large-scale maintenance and inventory preparation for fleets and repair shops. It saves procurement and inventory preparation time.
Each plunger is independently sealed in a transparent plastic tube, providing protection during storage and transportation.
Each plunger is placed separately in a hard, transparent plastic tube, with both ends sealed to isolate dust, bumps, and scratches on the precise sliding working surface of the plunger. It is not prone to rust or contamination from impurities and remains intact for long-term storage.
The segmented stepped plunger rod, with stable coaxiality during reciprocation
The plunger is made of a multi-stage stepped integrated rod body, with smooth transitions between segments. It moves in the pump cylinder without deviation or unilateral wear, maintaining a constant oil supply stroke during long-term bumpy operations, reducing the difference in fuel injection volume of the six cylinders, and making idling operation more stable.
Standard control and return oil holes on the side, with linear and smooth oil quantity adjustment
The middle section of the plunger is precisely equipped with a flow-through return oil hole, which perfectly matches the oil quantity adjustment gear ring of the oil pump. It responds uniformly to different load conditions, eliminating problems such as lack of acceleration power, large speed difference in power, and abnormal exhaust color.
Overall nitrided hardened alloy steel, wear-resistant and resistant to high pressure, and less prone to internal leakage
The entire set of plungers is made of high-hardness alloy steel through integrated processing. The surface is treated with nitriding hardening + mirror polishing, making the outer wall of the plunger smooth and wear-resistant. Diesel impurities and high-temperature high-pressure erosion are less likely to cause scratches or deformation, maintaining a micron-level sealing gap for a long time, and eliminating oil pressure leakage and pressure drop.
Applicable scenarios
This product is suitable for six-cylinder heavy-duty freight trucks, large mining excavators, heavy-duty loaders, high-power stationary diesel generators with mechanical direct injection fuel supply system. It is applicable to heavy machinery diesel engines in mining areas and construction sites for 24-hour full-load operation under high temperature and high dust conditions. The product is for major overhaul of the fuel injection pump.
Product Basic Parameters
Product Name: Fuel Injection Pump Piston Pair (6 pieces in a set box)
Part Number: 131153-0520, Replacement Part Number 9413610293
Number of Pieces per Box: 6 pieces / box
Main Material: Integral nitrided hardened alloy steel
Structural Feature: Segmented stepped piston rod, side-side guide oil return holes, independent transparent protective tube, 6 pieces in a set packaging box
Application Conditions: 24-hour continuous full-load operation, long-term high-temperature in the engine compartment, outdoor high-dust six-cylinder heavy-duty mechanical diesel engine fuel injection pump
Product Status: New precision piston pair, factory completed with calibration and testing for clearance, high-pressure sealing, and fuel supply stroke
Packaging: Outer layer of hard classified cardboard box, single piece with independent transparent sealed protective tube, plastic plugs at both ends of the piston for protection, supports single-box, multi-box bulk purchase, and is compatible with cross-border full-box logistics.
