Description
Product Overview
The plunger pair is assembled inside the high-pressure oil pump body and relies on the reciprocating motion of the plunger to compress the fuel to generate high pressure, which is the source of pressure in the fuel supply system. After being washed by long-term impurities from diesel and subjected to thousands of bar of reciprocating impact, the sealing gap between the plunger and the sleeve becomes larger, resulting in internal leakage of high-pressure fuel, difficulty in establishing the rail pressure, uneven fuel supply to each cylinder, significant power decline, and excessive black smoke in the exhaust. This product's plunger and sleeve are precisely matched and ground in pairs, with standardized dimensions for the installation holes on the flange base. Maintenance involves direct replacement of the entire set, suitable for agricultural machinery, light trucks, and small construction machinery for maintaining and servicing fuel injectors.
Core advantages of this product:
Micron-level mirror surface grinding of the plunger and sleeve, precise control of sealing gap
The plunger and sleeve are made of a single-piece quenched alloy steel, with ultra-precision mirror surface grinding on the inner and outer walls. The paired gap is strictly calibrated, and the sealing performance is stable during reciprocating motion, effectively blocking the internal reflux of high-pressure fuel, stabilizing the output pressure of the oil pump, and avoiding fuel supply attenuation.
Double-hole black flange installation base, no offset during assembly
The bottom thickened black flange base is reserved with standard double installation holes. After installation in the pump body, it is firmly clamped, and there is no eccentric wear or grinding during the reciprocating motion of the plunger, reducing single-sided wear and extending the service life. Assembly does not require additional positioning washers.
Tapered guide plunger rod, smooth and free from jamming during reciprocating motion
The tapered limit plunger rod has precise dimensions for the guiding section, and it is matched with the reciprocating sliding of the oil pump cam mechanism. It is not prone to jamming or deformation under high-frequency movement, ensuring uniform fuel supply per cycle and improving idle stability.
The sleeve is engraved with model and code, facilitating quick identification during storage and maintenance
The side wall of the sleeve is laser-engraved 090150-5971 part number, which is resistant to diesel soaking and wiping without blurring. It can be quickly identified during inventory and model matching, avoiding incorrect installation and abnormal oil pressure.
Overall high-hardness quenched steel, wear-resistant and resistant to high-pressure impact
The entire set of plunger, sleeve, and base undergoes quenching and tempering treatment. The surface is strengthened with a wear-resistant layer, able to withstand long-term high-pressure fuel erosion and wear from impurities. The service life is longer in harsh working conditions in the field and construction sites.
The set is paired and calibrated upon leaving the factory, and no on-site calibration is required after replacement
The plunger and sleeve are individually paired and tested upon leaving the factory. The fuel supply stroke and sealing gap are unified standards. Each unit is shipped as a complete set, and after maintenance and replacement, the oil pump's standard fuel supply pressure can be restored directly, reducing the debugging time.
Assembly component details (single unit)
Precision-ground plunger rod 1 piece
Matching high-pressure sleeve 1 piece
Black flange installation base 1 piece Applicable scenarios
This product is suitable for agricultural tractors with mechanical direct injection systems, light-duty freight trucks, small wheeled construction machinery, and fixed small diesel generators. It is applicable for light-load operations in farmlands, short-distance transportation in cities, and mechanical injection pump internal pressure components replacement in dusty and impure diesel environments.
Product Basic Parameters
Product Name: 090150-5971 Oil Pump Piston Pair
Part Number: 090150-5971
Main Material: Tempered hardened alloy steel (piston, sleeve), black anti-corrosion flange base
Structural Feature: Mirror-finished precision ground piston sleeve, double-hole flange installation base, stepped guide piston rod, sleeve engraved model identification
Application Conditions: Medium-high pressure reciprocating boost, cabin vibration, dusty and impure diesel environment mechanical direct injection diesel engine fuel injection pump core components
Product Status: New complete set of piston sleeves, factory completed sealing gap, fuel supply stroke, and high-pressure sealingity full calibration and testing
Packaging: Single independent hard tube protection, both ends of the piston equipped with plastic protective plugs, isolating the transportation impact and scratch of the precision ground surface, supporting single-piece retail, bulk purchase in boxes, and compatible with cross-border small items / full-box logistics.
