Liwei DLLA150P2596 Diesel Injector Nozzle for BOSCH 110 4.0 Series | QUANCHAI 0445110861/862 | YUCHAI/JAC/JMC Applications

The Liwei DLLA150P2596 injector nozzle is engineered as a direct service-grade equivalent for the BOSCH 110 4.0 series common rail system, precisely matching OEM references 0445110861 and 0445110862. Designed for high-pressure fuel atomization, this nozzle restores injection accuracy in commercial diesel engines experiencing poor spray patterns, increased smoke, or power loss. It delivers reliable performance under extreme rail pressures and is manufactured to meet or exceed original equipment tolerances for fit, flow, and durability.

This nozzle features a sacless tip design with 6 injection holes of 0.150 mm diameter, enabling a finely atomized spray cone that significantly improves combustion efficiency under high-pressure injection. The DLLA150P2596 operates at peak rail pressures up to 1,800 bar, with a static flow rate of 420 cc/30s at 100 bar. Constructed from high-alloy heat-treated steel, it resists cavitation and needle stick, ensuring consistent fuel metering across extreme thermal cycles common in turbocharged diesel applications.

This nozzle is a direct service match for QUANCHAI 0445110861/862 factory assemblies and is widely used in YUCHAI, JAC, and JMC medium-duty trucks, buses, and construction equipment. It directly replaces BOSCH 110 4.0 series injectors found in 4-cylinder and 6-cylinder diesel engines such as the YC4FA, YC4S, 4D27, and 4JB1 variants. Popular chassis applications include the JAC N-Series light trucks, JMC Kailing vans, and YUCHAI-powered forklifts and agricultural tractors, making this nozzle a versatile inventory choice for workshops servicing mixed fleets.

Prior to installation, ultrasonically clean all injector pockets and replace copper sealing washers and O-rings to prevent combustion gas leakage. Always lubricate the nozzle threads with anti-seize compound and torque to 60–70 Nm using a calibrated wrench; overtightening distorts the nozzle body and alters spray geometry. After fitting, perform a leak-off test at idle and a return flow check under load to confirm needle movement and seat sealing. For common rail systems, reset fuel trim adaptions via diagnostic software (e.g., JAC/JMC dealer tools) to allow the ECU to relearn the new nozzle's flow characteristics, ensuring smooth idle and responsive throttle.

Worn or clogged injector nozzles are responsible for up to 40% of black smoke complaints and 30% of fuel consumption increases in high-mileage diesel trucks. The DLLA150P2596 restores the precise pilot, main, and post-injection events required for complete combustion, directly reducing particulate emissions and preventing DPF overload. For repair shops, stocking this single nozzle covers multiple engine families, simplifying parts management. Fleet operators benefit from prolonged injector body life because replacing only the nozzle (instead of the entire injector) at 250,000–300,000 km intervals cuts maintenance costs by nearly half while maintaining OEM-level performance.

Q1: Is this nozzle a direct swap for the original BOSCH unit or requires modification?
A: Direct drop-in replacement. It matches the BOSCH 110 4.0 footprint and the 0445110861/862 specs. No shimming or holder changes are needed; just follow standard torque and cleaning procedures.

Q2: How can I verify if this nozzle suits my YUCHAI YC4FA engine?
A: Check your original injector body for the stamped number 0445110862. If present, the DLLA150P2596 is the correct service nozzle. Also confirm your engine serial prefix matches YC4FA or YC4S families.

Q3: What is the expected service life under normal operating conditions?
A: With clean, water-free diesel and regular filter changes, expect 250,000–300,000 km. High-sulfur or biofuel blends may reduce lifespan; we recommend periodic spray-pattern testing every 80,000 km.

Q4: Can I install just the nozzle or must I replace the whole injector assembly?
A: You can replace only the nozzle. It is a standard service part. However, always inspect the injector body's pilot valve and armature for wear; if damaged, a complete assembly is advised.

Q5: Does this nozzle work with aftermarket tuning boxes or modified ECUs?
A: Yes, but within limits. The 0.150 mm hole size supports up to +15% fuel flow without compromising spray penetration. For extreme tuning, we recommend consulting your tuner for injector calibration adjustments.

Q6: What quality assurance does Liwei provide for this nozzle?
A: Each batch is 100% tested for seat leakage, dynamic flow, and spray pattern on dedicated test benches, with certificates available upon request. The nozzle carries a 12-month workshop warranty against manufacturing defects.

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