Zexel DLLA156SM058 105025-0580 Diesel Injector Nozzle for Isuzu 6HH1 NPR Engine

Product Details

Product Overview

This high-precision diesel injector nozzle, identified by the model DLLA156SM058 and part number 105025-0580, is a genuine Zexel component specifically designed for the Isuzu 6HH1 engine platform. As a critical fuel system component, this nozzle ensures optimal atomization of diesel fuel for efficient combustion, directly impacting engine performance, fuel economy, and emission control.

Commonly used in Isuzu NPR series trucks and other commercial vehicles powered by the 6HH1 engine (produced between 1976 and 1993), this injector nozzle is a direct replacement part for maintaining or restoring factory-specified injection characteristics. It is a new, genuine unit sourced from Japan, ensuring compatibility and reliability for heavy-duty applications.

Key Features & Benefits

• Precision Fuel Atomization: The multi-hole orifice design (DLLA156SM058) delivers a finely atomized fuel spray pattern, ensuring thorough mixing with air for complete combustion and maximum power output.
• Genuine Zexel Quality: As a genuine Zexel product, this nozzle meets the original equipment manufacturer’s stringent specifications for material hardness, flow rate, and dimensional accuracy.
• Direct Fit for Isuzu 6HH1: Engineered as a direct OE replacement for the Isuzu 6HH1 engine, guaranteeing a perfect fit without modifications. The specific application includes the NPR series chassis.
• Enhanced Durability: Constructed from high-grade hardened steel, the nozzle is built to withstand the extreme pressures and temperatures inside the combustion chamber, ensuring a long service life.
• Improved Engine Performance: Replacing worn or clogged nozzles with this new unit restores proper injection timing and spray pattern, leading to smoother idling, reduced smoke, and improved throttle response.
• Fuel Economy & Emission Compliance: Optimized fuel atomization directly contributes to lower fuel consumption and reduced harmful emissions, helping to maintain compliance with environmental standards.

Technical Specifications

OEM Cross-Reference

This injector nozzle is directly interchangeable with the following OEM and standard part numbers. Please verify your existing part number before ordering.

• Primary Part Number: 105025-0580
• OEM Model Number: DLLA156SM058
• Common Cross-References: This specific Zexel nozzle (DLLA156SM058) is the standard service part for the Isuzu 6HH1 engine and is also listed under various Isuzu and aftermarket part catalogs that cross-reference to 105025-0580.

Compatibility

This product is commonly used for the following applications:

• Engine Model: Isuzu 6HH1 (Diesel, naturally aspirated or turbocharged variants)
• Vehicle Models: Isuzu NPR Series (NPR66, NPR57, etc.), Isuzu Forward (medium-duty truck), and other industrial or marine applications utilizing the 6HH1 engine block.
• Year Range: Commonly used in vehicles produced between 1976 and 1993.

Note: While the 6HH1 engine is the primary application, always double-check the nozzle part number (DLLA156SM058) against your current injector for absolute compatibility.

Global Supply & Distribution

We offer worldwide shipping capabilities to serve the global diesel engine repair and maintenance market. Our supply chain is structured to ensure fast and reliable delivery to major ports and industrial centers across:

• North America: Los Angeles, Houston, New York, Toronto
• Europe: Rotterdam, Hamburg, London, Dubai
• Asia-Pacific: Singapore, Tokyo, Sydney, Shanghai
• Middle East & Africa: Dubai, Jeddah, Lagos, Nairobi

With extensive export experience, we ensure proper documentation and international trade compliance for all shipments. We can handle various incoterms (FOB, CIF, DDP) to meet your specific logistical requirements.

Quality Assurance

Every injector nozzle undergoes rigorous quality control checks to ensure it meets the highest standards of performance and durability.

• Manufacturing Standards: Produced in ISO-certified facilities in Japan, adhering to Zexel’s strict original equipment specifications.
• Testing Procedures: Each unit is tested for opening pressure, spray pattern quality, and leakage before packaging.
• Warranty: We provide a 6-month warranty against manufacturing defects. Our after-warranty service includes video technical support to assist with installation and troubleshooting.

FAQ

Q1: How can I confirm this nozzle fits my Isuzu 6HH1 engine?
A: The most reliable method is to remove one of your current injector nozzles and check the stamped number on its side. It should read DLLA156SM058 or 105025-0580. If the number matches, this part is a direct, drop-in replacement. This nozzle is specifically engineered for the 6HH1 engine platform used in NPR trucks.

Q2: What are the symptoms of a bad injector nozzle I should look for?
A: Common signs of a failing nozzle include: rough engine idling, excessive black smoke from the exhaust, a noticeable drop in fuel economy, engine knocking or misfiring, and difficulty starting, especially when the engine is hot. Replacing a worn nozzle with this genuine unit will typically resolve these issues.

Q3: Do I need to calibrate the injector after installing this nozzle?
A: Yes, professional installation is strongly recommended. While the nozzle itself is a direct fit, the entire injector assembly (nozzle, holder, and spring) should be re-calibrated on a diesel injection test bench to ensure the correct opening pressure (typically around 190-220 bar for this application) and proper spray pattern. This ensures optimal engine performance and longevity.