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.
Plunger couples are precise partners for engine fuel systems. It consists of a plunger and a plunger sleeve, with excellent material properties and a fitting gap of 0.0015 - 0.0025mm. The plunger reciprocates at high speed in the pump, accurately supercharges the fuel and supplies it on demand, effectively improving engine power performance and reducing fuel consumption.
Overview
The P Series Plunger Assembly is a precision-manufactured component designed for use in diesel fuel injection pumps, specifically in inline fuel systems. Its core function is to deliver high-pressure, metered fuel to the combustion chambers, ensuring accurate injection timing and quantity for optimal engine performance. Built from high-grade alloy steel with precision grinding and surface hardening treatment, the P Series is ideal for medium to heavy-duty diesel applications.
Whether powering transport vehicles, construction machinery, or agricultural engines, the P Series plunger guarantees consistent fuel delivery, reduced emissions, and improved engine durability.
Key Features & Advantages
High Injection Pressure
Supports efficient combustion by delivering diesel fuel at consistent, high pressures.
Precision Machining
Manufactured with tight tolerances for reliable performance and uniform fuel distribution across cylinders.
Durable Construction
Made from wear-resistant, hardened steel to withstand harsh operating conditions, corrosion, and long-term mechanical stress.
Efficient Fuel Delivery
Maintains smooth engine operation, better throttle response, and reduced fuel consumption.
Wide Compatibility
Available in multiple sizes to match a variety of Bosch-style inline fuel injection pumps used in trucks, tractors, marine engines, and generators.
Applications
The P Series Plunger Assembly is commonly used in:
Commercial Diesel Vehicles
Trucks, buses, and delivery vans with inline injection systems
Agricultural Machinery
Tractors, harvesters, and irrigation equipment
Construction Equipment
Loaders, bulldozers, excavators, and paving machinery
Stationary Diesel Engines
Generators, pumps, and marine propulsion systems
FAQ
How many production lines in your factory?
5 production lines.
What is your MOQ?
100 pieces.
Can you design the equipment according to our size?
Yes.
What type of fuel injection system uses the P Series plunger?
The P Series is used in inline fuel injection pumps, typically found in mid- to large-sized diesel engines requiring precise, high-pressure fuel injection.
How can I tell if my plunger assembly needs replacement?
Symptoms include hard engine starts, uneven idling, black smoke, reduced fuel efficiency, or engine knocking. These issues often indicate poor fuel atomization or delivery problems caused by a worn plunger.
Can I replace the P Series plunger myself?
It’s possible with the right tools and mechanical knowledge, but due to the precision involved in calibration, it’s strongly recommended that a certified technician handle installation to ensure accurate timing and alignment.
What affects the lifespan of the plunger assembly?
The main factors include fuel quality, filter maintenance, and engine operating conditions. Contaminated diesel or irregular maintenance can lead to early wear or failure.
How long does a P Series plunger typically last?
With proper maintenance and clean fuel, it can last 2,000 to 3,000 operating hours or more.
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.
