Denso OE Specification Injector Nozzle with Precision-Ground Needle for ISUZU 4HL1 6HL1 Engines at 1600+ bar Pressure
The injector nozzle carrying OEM numbers 8-97367552-5 and 8973675525 is a direct replacement for the Denso common rail injector assembly used in ISUZU 4HL1 and 6HL1 diesel engines. This nozzle is the fuel-metering component at the tip of the injector, responsible for atomizing high-pressure fuel into the combustion chamber with micron-level precision.
The 4HL1 is a 4.777-liter inline-4 common rail direct injection engine with a bore and stroke of 115 mm × 115 mm. Available in naturally aspirated, turbocharged, and intercooled variants (4HL1, 4HL1-TC, 4HL1-TCS), it produces between 96 kW and 132 kW at 2,700-3,000 rpm, with peak torque ranging from 333 N*m to 500 N*m at 1,500 rpm depending on the variant. The 6HL1 is a 6-cylinder version of the same engine family, sharing the same common rail fuel system architecture.
A worn or clogged injector nozzle results in rough idle, increased fuel consumption, white or black exhaust smoke, hard starting, or engine knock. This replacement nozzle restores the original spray pattern and fuel delivery, ensuring complete combustion and factory-specified engine performance.
This ISUZU injector nozzle 8-97367552-5 fits the following engines and vehicles:
| Chassis / Model | Engine | Years | Notes |
|---|---|---|---|
| ISUZU NPR | 4HL1 / 4HL1-TC / 4HL1-TCS | 2000-2010 | N-series medium-duty truck |
| ISUZU NKR | 4HL1 | 2000-2010 | Light cab-over chassis |
| ISUZU NHR | 4HL1 | 2000-2010 | Light-duty variant |
| ISUZU NQR | 4HL1 | 2000-2010 | Medium chassis, GVWR up to 9,000 kg |
| ISUZU 6HL1 | 6HL1 | 2000-2010 | Forward / F-series (inline-6 version) |
| ISUZU ELF (Japanese domestic) | 4HL1, 6HL1 | 2000-2010 | All N-series chassis variants |
| ISUZU FORWARD F-series | 6HL1 | 2000-2010 | Heavy chassis, export markets |
This nozzle is also compatible with 4HK1 and 6HK1 engines (4.8-5.2 L common rail) in certain applications. However, confirm the original part number before ordering.
The nozzle is manufactured to Denso's original equipment standards, with a needle and body mating surface lapped to sub-micron tolerance. This ensures consistent opening pressure (±5 bar tolerance per Denso factory spec) and spray pattern across all six injection holes.
The needle is machined from high-speed steel and precision-ground to a surface finish of Ra ≤ 0.1 µm. This smooth finish reduces sliding friction inside the nozzle body, allowing the solenoid to open the injector more quickly and close with less residual dribble.
The nozzle accepts multiple supersession numbers: 8-97367552-0 through -6, 8973675520 through -9, 095000-5500, and 095000-5501 -6. When a customer searches by any of these numbers, this listing covers the correct replacement.
The 4HL1 and 6HL1 engines use a Denso common rail system that is susceptible to nozzle wear caused by poor fuel quality or high-mileage operation. Replacing the nozzle restores the original spray angle and atomization.
Each batch is produced in an IATF 16949 certified facility - the automotive industry standard for quality management in component production. Material certificates and dimensional inspection records are retained per batch.
The 4HL1 and 6HL1 ECUs require injector ID codes to be programmed after nozzle replacement. This nozzle is fully compatible with the Denso coding process, using the 24-digit alphanumeric code printed on the injector body.
- One Nozzle Covers Multiple ISUZU Engine Lines - The same 8-97367552-5 nozzle fits 4HL1 (inline-4) and 6HL1 (inline-6) engines, reducing inventory requirements
- Prevents Expensive Injector Assembly Replacement - Restores fuel delivery at a fraction of the cost of a complete injector assembly
- Restores Power and Fuel Economy on High-Mileage Engines - Returns engine's torque output and fuel consumption to near-factory levels
- Certified for IATF 16949 Quality Standards - Manufacturing facility holds IATF 16949 certification specific to automotive component production
- Lightweight and Compact for International Shipping - Each nozzle weighs approximately 0.10-0.12 kg and packs into a 5 × 5 × 8 cm carton
Each batch of the ISUZU injector nozzle 8-97367552-5 undergoes comprehensive verification:
| QC Item | Verification Method |
|---|---|
| Needle-body clearance | Air flow test - clearance within 0.002-0.005 mm |
| Opening pressure | Denso nozzle tester - verified at specified pressure (±5 bar) |
| Spray pattern | High-speed camera inspection - uniform spray with defined cone angle |
| Seat leakage | Pressure decay test - fuel leakage ≤ 1 cm³ per 30 seconds |
| Orifice condition | Microscope inspection at 200× magnification |
| Needle lift | Dial gauge measurement - stroke within OE tolerance |
| Material hardness | Rockwell hardness test - target HRC 58-62 on needle and body |
| Marking durability | Laser-etched part number - resistant to diesel fuel and cleaning solvents |
The facility holds IATF 16949 certification. A certificate of conformance (COC) with material analysis is available for wholesale orders.
- Individual packaging: Sealed in anti-rust VCI bag, foam-lined carton
- Carton dimensions: 5 × 5 × 8 cm per nozzle
- Net weight: 0.10-0.12 kg; gross weight (with packaging): 0.15 kg
- Master carton: 100 units per export carton (approx. 25 × 25 × 20 cm, 15 kg)
- Lead time: 3-7 working days for stock orders; 15-20 days for production orders above 500 pieces
- Minimum order quantity: 1 piece (sample order available)
- Shipping methods: FedEx, UPS, DHL for samples; sea freight (LCL/FCL) from Shanghai, Ningbo, Guangzhou ports
- H/S Code: 8409.99
For workshops performing a full fuel system overhaul, the supplier also stocks Denso control valves, injector sealing washers, and common rail repair kits for the 4HL1/6HL1 engines.
The ISUZU 4HL1 6HL1 injector nozzle 8-97367552-5 is a direct OE-spec replacement for Denso common rail diesel engines in NPR, NKR, NQR, ELF, and FORWARD trucks. It restores the original spray pattern, eliminates rough idle and hard starting, and returns fuel economy to factory levels. One part number covers both 4-cylinder and 6-cylinder engines. IATF 16949 certified with batch traceability and a 6-month warranty.
Order a sample unit today to verify fitment on your 4HL1 or 6HL1 engine - the same nozzle fits naturally aspirated, turbocharged, and intercooled variants across the entire ISUZU common rail platform.
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