Product Description
The types of plunger couples produced by Huahui Oil Pump and Nozzle Company include: BQ series, No. I series, No. II series, A series, AK series, AD series, P series, and high-pressure common rail series, with diameters ranging from 5 to 18 mm. With inclined grooves and spiral grooves with different leads and different rotational directions, the product can meet the needs of oil pumps for diesel engines with different performances.
As a key component of engine fuel supply, the plunger couple consists of a plunger and a plunger sleeve. Use high-quality alloy materials, and the matching gap is about 0.0015 - 0.0025mm. The plunger moves at high speed in the sleeve, supercharging and accurately distributing fuel, improving engine combustion efficiency and power performance.
Overview
The Plunger Assembly is a critical precision component in diesel fuel injection systems. It operates inside the injection pump to build high fuel pressure and regulate the amount of diesel injected into the engine's combustion chamber. By translating mechanical motion into hydraulic force, the plunger ensures accurate timing and precise fuel metering for efficient combustion and engine performance.
Manufactured using advanced heat treatment and high-precision grinding techniques, the plunger assembly offers exceptional durability, wear resistance, and fuel system reliability—making it essential for both light-duty and heavy-duty diesel engines.
Key Features & Advantages
High-Precision Fuel Injection
Ensures consistent fuel delivery at high pressure for better engine response and combustion efficiency.
Durable Construction
Made from alloy steel with hardened surfaces to withstand friction, corrosion, and long-term mechanical stress.
Improved Engine Efficiency
Reduces fuel consumption, enhances power output, and lowers exhaust emissions.
Reliable Performance
Maintains stability in high-load or continuous-use environments with minimal performance deviation.
Wide Compatibility
Available in multiple sizes and types to fit various inline and rotary diesel fuel injection pumps.
Applications
The Plunger Assembly is widely used in:
Agricultural Equipment (e.g., tractors, rice harvesters)
Construction Machinery (e.g., bulldozers, excavators)
Commercial Vehicles (e.g., diesel trucks, delivery vans)
Industrial Diesel Engines (e.g., generators, marine engines)
Its robust build and reliability make it ideal for demanding and continuous-duty applications.
FAQ
How long is your delivery time?
One week for spot goods, 60 days for orders.
Are you a trading company or a manufacturer?
Manufacturer.
What is your MOQ?
100 pieces.
Can you design the equipment according to our size?
Yes.
What does the plunger assembly do in a diesel engine?
It pressurizes and meters diesel fuel within the injection pump to ensure accurate and timely delivery to the engine cylinders.
What are signs that a plunger assembly needs replacement?
Symptoms include poor starting, uneven idling, reduced fuel efficiency, black smoke, and loss of engine power.
How often should a plunger assembly be replaced?
Under normal conditions, it can last 2,000–3,000 operating hours, but lifespan depends on fuel quality, engine load, and maintenance.
Can a plunger assembly be reused after servicing the fuel pump?
Reuse is not recommended if wear, scoring, or corrosion is present. Always inspect carefully and replace if any damage is found.
Is installation of the plunger assembly complicated?
Yes. It requires precise alignment and calibration. It is recommended to have it installed by a trained technician or fuel injection specialist.
Company Introduction
Changzhou Huahui Fuel Injection Equipment Co.,Ltd's main products include S and P series long and short injector assembly and injector nozzle parts. Injection pumps used in 165-1125 single-cylinder engines and plungers and oil delivery valve parts used in injection pumps. In recent years, with the efforts of our scientific research personnel, we have successively developed P series BQ type, PW type, P7 type, P8 type, PE type, PN type, P7100 type, P2000 type, high-pressure common rail series, etc., a total of more than 100 types of plunger parts and electronically controlled single pumps.
