ISUZU 6BG1 DLLA141SM373 4 Spray Holes Fuel Injector Nozzle 105025-3730 Diesel Injector Nozzle

The Fuel Injector Nozzle with OEM numbers 105025-3730 and 1050253730 — also referenced as DLLA141SM373 and NP-DLLA141SM373 — is a verified direct-fit replacement for ISUZU 6BG1 / 6BG1T / 6BG1TRA diesel engines used in ISUZU Forward / Giga trucks, Hitachi ZAX230 / ZAX270 / ZX200-5G / ZX240-3G / ZX160LC-5G / ZX180LC-5G / ZX130W excavators, and JCB JS330 construction equipment. This nozzle is a critical component of the diesel fuel injection system, responsible for atomizing fuel into the combustion chamber for efficient, clean combustion.

The fuel injector nozzle is the precision element at the tip of the fuel injector. It receives pressurized fuel from the injection pump and atomizes it into a fine mist that mixes with compressed air in the combustion chamber for ignition. The DLLA141SM373 nozzle features a throttle-type (S-type) design with a precision-ground needle and seat for accurate fuel metering. Manufactured from high-speed steel (W6Mo5Cr4V2 / 18CrNi8) and vacuum-hardened to HRC 62–65, it delivers wear resistance and long service life under the extreme pressures and temperatures of diesel combustion. The spray hole diameter of 0.29 mm allows uniform fuel distribution in four directions. The 6BG1 is a 6.5L inline-six direct-injection diesel engine widely used in ISUZU Forward trucks and Hitachi excavators from the 1990s onwards; the 6BG1TRA is the turbocharged variant used in ISUZU Forward heavy trucks.

• Engine misfiring or rough idle — clogged or worn nozzle holes cause uneven fuel delivery, resulting in rough operation and vibration.
• Excessive black smoke — poor atomization leads to incomplete combustion, producing black exhaust smoke.
• Power loss and increased fuel consumption — inefficient combustion reduces engine power and increases fuel usage.
• Hard starting — worn nozzles cause poor fuel delivery, making cold and hot starts difficult.
• Knocking or abnormal engine noise — irregular fuel spray patterns can cause combustion knock and increased engine noise.

Part Number: 105025-3730

Product Name: Injector Nozzle

Car Model: ISUZU

Engine Model: 6BG1

Condition: 100% Brand New

Size: Standard

Weight: Standard

Origin: China Mainland

Main Market: Middle East, Asia, Africa, South America, North America & Europe

Package: Neutral Packing or Made as Requested

Material: High-strength aluminum alloy & precision bearings

Cooling Type: Engine coolant circulation

Installation: Direct OEM replacement

Quality Standard: OEM equivalent / ISO quality control

• This nozzle is designed for the DLLA141SM373 specification. Confirm the nozzle model number of your original injector before ordering.
• The 105025-3730 is the primary reference number. The H105025373, 9 432 612 711, 1153113160, and ME727047 are interchangeable OEM numbers for the same application.
• Nozzles should be replaced as a complete set of six (for 6BG1) to ensure balanced fuel delivery across all cylinders.
• The 6BG1TRA engine uses this nozzle in ISUZU Forward heavy truck applications.
• For right-hand drive (RHD) vehicles, verify clearance and orientation. Refer to the ISUZU workshop manual for the correct procedure.

1. Preparation: Clean the injector and cylinder head area thoroughly. Disconnect the fuel lines and remove the injector from the cylinder head using a proper injector puller.
2. Disassembly: Clamp the injector body in a soft-jawed vise. Remove the nozzle retaining nut. Remove the old nozzle, needle, and copper washer.
3. Inspection: Inspect the injector body for wear or damage. Check the nozzle seat for pitting or erosion. Inspect the injector holder for cracks.
4. Cleaning: Clean all components with clean diesel fuel or approved injector cleaner. Do not use abrasive materials. Blow dry with compressed air.
5. Nozzle Installation: Install the new nozzle with a new copper washer. Torque the nozzle retaining nut to specification.
6. Opening Pressure Test: Test the injector on a nozzle tester. Verify opening pressure is within specification. Adjust with shims if necessary.
7. Leakage Test: Verify no leakage at pressures below opening pressure. Check spray pattern for proper atomization.
8. Installation: Install the injector into the cylinder head with a new O-ring and heat shield. Torque the injector clamp bolts to specification.
9. Reconnection: Reconnect fuel lines. Bleed the fuel system to remove air.
10. Final Check: Start the engine and check for fuel leaks. Verify smooth operation and no abnormal smoke.

• Every 20,000 km: Check for fuel leaks and abnormal exhaust smoke. Monitor fuel consumption.
• Every 40,000–50,000 km: Test injector opening pressure and spray pattern. Clean or replace nozzles as needed.
• Every 100,000 km: Replace fuel injector nozzles as preventive maintenance.
• When engine performance degrades: Test injectors immediately. Replace nozzles if spray pattern is irregular or opening pressure is out of specification.
• When fuel quality is poor: Inspect and clean injectors more frequently.

• Standard Packaging: Anti-rust oil + VCI film + neutral carton.
• Custom Packaging: Neutral box, color box, or customer-branded packaging.
• Suitable For: Diesel injection repair shops, ISUZU parts distributors, fleet maintenance centers, construction equipment repair shops.
• Supply Capacity: Stable batch supply with batch-level quality reports available.
• Minimum Order Quantity: 6 PCS (complete set for 6-cylinder engine).