Liwei M1703P156 Diesel Injector Nozzle – Enhanced-Durability Solution for High-Mileage Common Rail Systems
1. Product:M1703P156
2. Compatible Equipment: Diesel Fuel Injection Systems
3. Manufacturer: Aftermarket OEM Replacement
4. Condition: Brand New, Fully Tested
5. Origin: ABOSEDE Diesel
6. Shipping period: 3-5 business days
7. Payment terms: T/T, Western Union, PayPal
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Product Introduction
In common rail diesel systems, nozzle wear is accelerated by high injection pressures, EGR-induced soot, and the abrasive particles that bypass fuel filters – a combination that progressively degrades orifice geometry and needle sealing, increasing return flow and reducing combustion efficiency. The Liwei M1703P156 is an enhanced-durability nozzle engineered with an advanced DLC coating – a diamond-like carbon layer applied to the needle guide with a thickness of 2.0 µm, 33% thicker than the standard 1.5 µm coating used in comparable nozzles. This thicker layer provides a surface hardness of 2,400 HV and a coefficient of friction of 0.08–0.10, reducing the wear rate in high-mileage applications and extending the nozzle's service life by approximately 20%. This nozzle features an 8-hole configuration with 0.195 mm diameter orifices and a 150° spray angle – a geometry that delivers a static flow of 950 cc/min at 100 bar, matching the flow requirements of medium-displacement V6 and inline-6 diesel engines used in Mercedes OM642, BMW M57/N57, and Jaguar/Land Rover 3.0L TDV6 applications.
█ Application Coverage – Compatible Injector Platforms
The M1703P156 is designed to replace nozzles in the following common rail injector families:
Bosch CRI 2.0 / 2.2 – Injectors with 8-hole × 0.195 mm nozzle geometry, including 0445110270, 0445110271, and similar part numbers
Denso G2 / G3 – Injectors with 8-hole × 0.195 mm configuration
Vehicle Applications – Mercedes OM642, BMW M57/N57, VW/Audi 3.0 TDI, Jaguar/Land Rover 3.0L TDV6, and similar platforms
The nozzle is a direct replacement for Bosch part numbers 0445110270, 0445110271, and Denso nozzles with the 8 × 0.195 mm configuration. It is supplied as a bare nozzle – the needle and nozzle must be lapped together during assembly.
▐ Technical Specifications – Dimensional and Flow Data
| Parameter | Specification |
|---|---|
| Nozzle Type | Inward-opening, differential pressure |
| Number of Holes | 8 |
| Orifice Diameter | 0.195 mm |
| Spray Angle | 150° |
| Needle Diameter (guide) | 4.3 mm |
| Needle-to-Nozzle Clearance | 4 – 6 µm |
| Material | High-speed steel (M42-grade) |
| Surface Coating | DLC (diamond-like carbon), 2.0 µm |
| Coating Hardness | 2,400 HV |
| Coefficient of Friction | 0.08 – 0.10 |
| Surface Finish (guide) | Superfinished (Ra ≤ 0.08 µm) |
| Max. Rail Pressure Compatibility | 1,800 bar (26,100 psi) |
| Hydraulic Opening Pressure | 225 ± 10 bar |
| Static Flow @ 100 bar | 950 cc/min |
| Hole-to-Hole Flow Variation | ≤ 1.5% |
| Seat Angle | 60° (conical) |
| Seat Diameter | 3.9 mm |
| Needle Lift | 0.23 mm |
| Service Life Improvement | 20% over standard coating |
◆ Construction Details – The Enhanced-Durability Design
→ M42 High-Speed Steel: The nozzle is manufactured from M42-grade high-speed steel with 8% cobalt content, retaining hardness up to 650°C for the high thermal loads of V6 diesel engines.
→ Enhanced DLC Coating: The needle guide receives a 2.0 µm diamond-like carbon coating, providing a hardness of 2,400 HV and a coefficient of friction of 0.08–0.10 – the lowest in its class.
→ Superfinished Guide Surface: The guide is superfinished to Ra ≤ 0.08 µm, ensuring smooth needle movement and consistent injection timing.
→ Flow-Balanced Orifices: The 8 holes are laser-drilled and flow-balanced to a hole-to-hole variation of less than 1.5%, ensuring symmetrical spray and even combustion distribution.