Description
6N7527 Diesel Mechanical Injection Pump Dedicated Oil Outlet Valve Assembly, a precision component for the high-pressure holding core of the oil pump. It consists of a single integrated guide piston, multiple layers of buffer gaskets, a high-pressure reset spring, and a limit base. It is sold in pairs and is completed with all the necessary calibration for high-pressure holding, opening response, and sealing clearance upon delivery. It addresses issues such as oil pump pressure relief, slow establishment of track pressure, incomplete fuel injection, difficulty in cold start, idle vibration, black smoke, and increased fuel consumption. It is independently protected and packaged, suitable for corresponding models of construction machinery, heavy trucks, and high-pressure oil pumps for major overhaul replacement. Product Overview
The oil outlet valve is installed above the high-pressure oil pump piston and is responsible for locking the high-pressure fuel in one direction, preventing the backflow of high-pressure fuel and pressure relief. It stabilizes the fuel injection pressure. After long-term high-pressure impact, wear from diesel impurities, and spring elasticity decline, the valve seat sealing surface may leak, and the spring may become weak, resulting in rapid drop in oil pressure, uneven fuel supply in each cylinder, shutdown dripping, carbon deposits, and increased fuel consumption. This complete assembly of the oil outlet valve ensures that the oil pump has all the necessary calibration for high-pressure holding, opening response, and sealing clearance. This product is fully compatible with the corresponding pump head and does not require separate matching of gaskets or springs. It can be directly replaced as a complete set during maintenance, suitable for maintenance of direct injection oil pumps of mining excavators, heavy-duty loaders, and heavy long-distance trucks. Single-Piece Set Core Advantages
Integrated mirror surface guide piston, zero backflow in one direction
The piston is a single-piece forged from high-hardness alloy steel, with a mirror surface finish on the outer wall, ensuring high sealing accuracy with the valve seat. The fuel supply opens smoothly, closes instantly when the fuel supply is cut off, blocking the backflow of high-pressure fuel, and maintaining stable oil pressure in the pipeline.
Multi-layer separate buffer gaskets, buffering high-pressure impact to prevent wear
The matching multi-layer metal buffer gaskets provide separate buffering for the instantaneous high-pressure impact of fuel, distributing the force on the spring and the base, reducing fatigue wear of components caused by high-frequency reciprocating motion, and prolonging the service life of the oil outlet valve.
Thickened high-pressure reset spring with durable elasticity
The spring is treated by high-hardness alloy steel quenching and tempering, with the number of coils and diameter matching the original factory stroke. It does not deform or become weak under high-frequency reciprocating motion, ensuring the piston to reset quickly and eliminating poor closure and poor atomization of dripping.
Thickened bottom limit base, no assembly offset
The base is designed with a wider and thicker design, accurately positioning when installed in the pump head, ensuring no inclination or wear during reciprocating motion. The base surface is flat, and it can be sealed with gaskets to prevent fuel leakage from the pump head gap.
Packed in pairs for shipment, improving maintenance preparation efficiency
The product is packed in pairs to meet the need for simultaneous replacement of multiple cylinders' oil pumps, eliminating the cumbersome process of separately purchasing single components and reducing the inventory management cost of maintenance stores.
Overall made of high-pressure-resistant alloy steel, suitable for harsh heavy-duty conditions
The piston, spring, and base are all processed from high-hardness alloy steel, with surface strengthening treatment, capable of withstanding thousands of bar of oil pressure and the erosion of diesel impurities from mining areas, and remaining in full load operation for 24 hours without failure.
Assembly Component Details (Single Unit)
Precision guide piston 1 piece
Multi-layer metal buffer gasket set
High-pressure reset spring 1 piece
Bottom limit sealing base 1 piece Applicable scenarios
It is suitable for large mining excavators with mechanical direct injection high-pressure fuel supply system, heavy-duty wheeled loaders, long-distance heavy-duty freight trucks, fixed high-power diesel generators, and is applicable to the overhaul of high-pressure oil pumps for heavy-duty diesel engines in harsh environments such as 24-hour uninterrupted full-load operation in mining areas, continuous high-temperature in the engine compartment, and high-dust and impurity-containing diesel fuel.
Product basic parameters
Product name: High-pressure oil pump outlet valve assembly
Part number: 6N7527
Main material: Tempered hardened alloy steel (plunger, spring, base, gasket)
Structural features: Mirror-guided plunger, multi-layer buffer gasket, thickened high-pressure reset spring, bottom-limiting base, paired matching
Application conditions: High-frequency high-pressure fuel supply shock, long-term high-temperature vibration in the engine compartment, impurity-containing diesel environment for heavy-duty mechanical direct injection diesel engine oil pump pressure retention components
Product status: New and complete outlet valve assembly, factory completed with full calibration and testing of pressure retention performance, sealing accuracy, and spring elasticity
Packaging: Two independent hard tubes for protection, plastic plugs at both ends for protection to avoid磕碰划伤 the precise sealing surface of the plunger during transportation， supports paired purchase， bulk stocking in boxes， and is compatible with cross-border small items and full-box logistics
