DLLA152P2344 Common Rail Nozzle: Specs, Injector Compatibility & Weichai WD10

The Bosch DLLA152P2344 is a 5‑hole common rail nozzle specifically designed for Weichai WD10 series diesel engines (Euro IV / EU Stage III standards). This nozzle is factory‑installed in Bosch injector assembly 0 445 120 343 (Weichai OE reference: 612640080031) and operates at pressures typical of Bosch CRI2 common rail systems. The DLLA152P2344 carries a flow code of 2344 – placing it at the higher end of the DLLA152P series in terms of fuel delivery capacity.

This nozzle is specifically calibrated for Chinese market heavy‑duty applications, primarily Weichai‑powered trucks, construction machinery, and marine equipment.

Key specifications at a glance:

Parameter	Data
Nozzle stamping	DLLA152P2344
Bosch order number	0 433 172 344 (0433172344)
DENSO alternative number	093400‑2344
Number of holes	5
Flow code	2344 (high‑flow calibration)
Compatible injector	0 445 120 343
Solenoid valve	F 00R J01 692 (F00RJ01692)
Engine application	Weichai WD10 series (Euro IV / EU Stage III)
Weichai OE reference	612640080031
Cross references	0433172344, 093400‑2344

Introduction
Complete Technical Specifications
Compatible Injector Assemblies and OEM Cross‑References
Solenoid Valves and Professional Repair Kits
Vehicle and Engine Applications – Weichai WD10 Focus
Common Failure Symptoms and Diagnosis
Installation and Replacement Guidelines
FAQ (7 Questions)
Looking for DLLA152P2344 Nozzles?
Conclusion

1. Introduction

The Bosch DLLA152P2344 is a 5‑hole common rail nozzle designed for the Weichai WD10 series – a 9.726L inline six‑cylinder turbocharged diesel engine.
The nozzle is factory‑installed in Bosch injector assembly 0 445 120 343 (CRIN2‑16‑BL) and operates at pressures typical of Bosch CRI2 systems.
The flow code 2344 indicates high fuel delivery capacity, suitable for the WD10’s 170–320 HP (125–240 kW) power range.
Primary applications: Weichai‑powered heavy trucks, construction machinery, and marine equipment in the Chinese market.

2. Complete Technical Specifications

2.1 Identification Numbers

Nozzle stamping: DLLA152P2344
Bosch order number: 0 433 172 344 (also 0433172344)
DENSO alternative number: 093400‑2344
Injector assembly number: 0 445 120 343
Weichai OE reference: 612640080031
Cross references: 0433172344, 093400‑2344

2.2 Physical Characteristics

Component type: Multi‑hole common rail nozzle (DLLA series, standard sac volume)
Number of holes: 5
Material: High‑speed steel, vacuum hardened (HRC 62–65)
Gross weight (per nozzle): 45 g
Complete injector weight: 650–750 g
Fuel compatibility: Diesel (EN 590 / ASTM D975)

2.3 Hydraulic and Performance Data

Flow code: 2344 (high‑flow calibration within DLLA152P series)
Compatible injector: 0 445 120 343 (Bosch CRIN2‑16‑BL)
Compatible solenoid valve: F 00R J01 692 (F00RJ01692)
Static return flow (new, test stand): Refer to Bosch CRI2 specifications
Repair kit reference: F 00R J03 548 (includes nozzle + solenoid + gaskets)

3. Compatible Injector Assemblies and OEM Cross‑References

The DLLA152P2344 nozzle is factory‑matched to Bosch injector assembly 0 445 120 343 (CRIN2‑16‑BL family, CRI2 generation).
Primary fitment: Injector 0 445 120 343 with nozzle DLLA152P2344 for Weichai WD10 Euro IV.
Weichai OE number: 612640080031
Alternative nozzle numbers: 0433172344, 093400‑2344
Injector generation features: Improved solenoid response times, enhanced sealing durability, Euro IV compatibility.
Location of injector number: Laser‑etched on the solenoid valve body or upper injector body (format: 0 445 120 343).

4. Solenoid Valves and Professional Repair Kits

4.1 Solenoid Valve Compatibility

Compatible solenoid valve: F 00R J01 692 (F00RJ01692)
This solenoid is used across multiple Bosch CRIN2 injectors within the CRI2 platform.
Function: High‑speed actuator controlling pressure in the injector’s control chamber; failure causes fault codes and zero injection on that cylinder.

4.2 OEM Repair Kit

Repair kit number: F 00R J03 548 (F00RJ03548)
Components included:
- Nozzle DLLA152P2344 (0 433 172 344)
- Solenoid valve F 00R J01 692
- Control valve assembly
- Sealing components (O‑rings, copper gaskets)

4.3 Professional Rebuilding Notes

Check nozzle tight cap for deformation, cracking, or thread damage.
Examine needle and seat under magnification (at least 20×).
Inspect internal sealing surfaces for burrs or contamination.
Replace tight cap after more than 5 disassemblies.

5. Vehicle and Engine Applications – Weichai WD10 Focus

5.1 Weichai WD10 Engine Specifications

Displacement: 9.726 L
Cylinders: Inline 6
Bore × stroke: 126 mm × 130 mm
Power range: 125–240 kW (approximately 170–320 HP)
Emissions standards: Euro IV / EU Stage III (off‑road)
Fuel system: Bosch common rail (CRI2)
Aspiration: Turbocharged / Turbocharged and intercooled

5.2 Vehicle Applications

Trucks (heavy‑duty – primary market)

Weichai‑powered heavy trucks with WD10 Euro IV engine
Foton Auman heavy trucks
Dongfeng heavy trucks (WD10 variants)
Shacman trucks (Weichai‑powered models)

Construction Equipment

Loaders, graders, bulldozers, excavators with WD10 engines
Power range for this sector: 162–199 kW

Marine Applications

Weichai WD10 series marine diesel engines
Power range: 125–240 kW
Optimized for high humidity and vibration

Agricultural and Industrial

Tractors and heavy agricultural machinery using WD10 engines
Generator sets and pumps
Industrial equipment requiring Euro IV compliance

5.3 How to Confirm Fitment

Injector assembly number must be 0 445 120 343.
Engine stamping should indicate WD10 series.
Emissions label should show Euro IV compliance.
Weichai OE reference: 612640080031.

6. Common Failure Symptoms and Diagnosis

6.1 Failure #1: Fuel Contamination (Most Common)

Mechanism: Impurities (water, lead, aluminum powder, iron powder, sulfide) cause wear on precision surfaces.
Symptoms: Black smoke, reduced power, difficulty starting.
Severity: High – can lead to injector damage.

6.2 Failure #2: Needle Wear and Oil Hole Blockage

Mechanism: Long‑term high‑temperature operation causes needle wear, leading to blockage and insufficient injection.
Symptoms: Poor acceleration, cylinder misfire, increased fuel consumption.
Severity: Medium – detectable by return flow test.

6.3 Failure #3: Nozzle Spring Rust or Fracture

Mechanism: Moisture in fuel causes spring rust and fracture.
Symptoms: Black smoke, injector knocking noise.
Severity: High – replace immediately.

6.4 Failure #4: Needle Valve Lift Gasket Wear

Mechanism: Adjustment gasket wears, increasing needle stroke and fuel quantity.
Symptoms: Black smoke, gradual performance loss.
Severity: Medium.

6.5 Failure #5: Nozzle Cap Cracking (Thermal Fatigue)

Mechanism: High‑intensity work under high temperature causes cap cracking.
Symptoms: Black smoke, external fuel leakage, combustion gas blow‑by.
Severity: High – replace cap after 5 disassemblies.

6.6 Opening Pressure Deviation

Pressure above or below specified range may cause injector damage.
Decreased opening pressure leads to increased injection quantity and black smoke.

6.7 Consequences of Untreated Failure

Needle may stick, causing serious injector damage.
Failure to replace worn parts in time may lead to injector destruction.

6.8 Diagnostic Methods

Step 1: Return Flow (Leak‑Off) Test

Use six graduated bottles and hoses.
Procedure: Disconnect return hoses, connect bottles, idle engine for 2 minutes, compare volumes.
Interpretation for Weichai WD10:
- All bottles within 10% → healthy
- One bottle significantly higher → internal wear, plan replacement
- One bottle zero → injector stuck closed (solenoid or nozzle issue)
- All bottles high → pump or pressure regulator issue

Step 2: Test Stand Inspection

Requires Bosch‑compatible test stand (EPS 200, EPS 205, or DCI 700).
Verify: spray pattern (5 holes symmetric, no dripping), opening pressure (within range), dynamic flow (linear curve), static return flow (per specification).
Examine all components under microscope at least 20×.

Step 3: ECU Fault Code Reading

Use Weichai/Bosch diagnostic tool.
Common codes:
- Injector circuit codes → solenoid valve failure (open or short)
- Cylinder balance codes → ECU monitoring of crankshaft acceleration

7. Installation and Replacement Guidelines

7.1 Pre‑Installation Checks

Verify nozzle stamping: DLLA152P2344.
Confirm injector assembly number: 0 445 120 343.
Confirm Weichai OE reference: 612640080031.
Inspect injector body for cracks, corrosion, or damage.
Check nozzle tight cap for deformation, cracking, thread damage, or leakage.
Gather new copper gasket and new tight cap (if >5 disassemblies).
Clean injector bore and seat with compressed air.

7.2 Torque Specifications

Nozzle retaining nut (tight cap): Refer to Bosch CRI2 manual – do not over‑torque.
Injector hold‑down clamp: Refer to engine service manual.
High‑pressure fuel line: Refer to engine service manual – use calibrated torque wrench.

Critical warnings:

Cap cracking caused by high‑intensity work at high temperature.
Deformation, cracking, thread damage, or leakage leads to black smoke and injector damage.
Over‑torquing cracks cap or deforms nozzle body.
Under‑torquing allows leakage and gas blow‑by.

7.3 Step‑by‑Step Installation Procedure

Step 1: Remove old nozzle

Disassemble injector per Bosch service procedure.
Discard old nozzle, old copper gasket, and old tight cap (if worn).
Clean injector body with clean diesel – no abrasives or wire brushes.

Step 2: Install new DLLA152P2344 nozzle

Insert new nozzle, align locating pin with notch.
Install new tight cap if disassembly count >5.
Torque nozzle cap to Bosch CRI2 manual specification.

Step 3: Install injector into cylinder head

Insert new copper gasket – never reuse old gaskets.
Lower injector assembly into bore, ensure complete seating.
Install hold‑down clamp and torque to engine manual specification.

Step 4: Reconnect fuel system

High‑pressure fuel lines – torque to engine manual specification.
Return lines.
Electrical connector to solenoid valve F 00R J01 692.

Step 5: Prime fuel system

Turn ignition ON, allow electric priming pump to run.
If manual primer lever exists, pump 20–30 times.
Crank engine; may take 10–15 seconds to bleed air.

Step 6: Test stand verification (recommended)

Test injector on Bosch‑compatible test stand.
Verify spray pattern symmetry and static return flow.

Step 7: Leak check and trim reset

Idle engine, inspect for fuel leaks at all connections.
Use diagnostic tool to reset injector trim codes if required.

7.4 Full Set Replacement Recommendation

Always replace all six nozzles as a matched set on WD10 engine.
Replacing only one nozzle while others are worn causes:
- Cylinder‑to‑cylinder imbalance
- Rough idle and vibration
- Fault codes (cylinder balance)
- Reduced fuel economy (5–10% drop)
- Faster wear on the new nozzle

7.5 Common WD10‑Specific Installation Mistakes

Using old copper gaskets → sealing failure, gas blow‑by.
Over‑torquing nozzle cap → cap cracking, injector damage.
Reusing tight cap after >5 disassemblies → loss of clamping force, internal leakage.
Skipping test stand verification → uncertain spray pattern quality.
Forgetting to prime fuel system manually → prolonged cranking, starter damage.

8. FAQ

1. What injector assembly uses DLLA152P2344?

Bosch injector assembly 0 445 120 343 (Weichai OE 612640080031). It is a Bosch CRIN2‑16‑BL injector for Weichai WD10 Euro IV.

2. What engines and vehicles use this nozzle?

Weichai WD10 series 9.726L Euro IV diesel engines.
Applications: heavy trucks (Foton Auman, Dongfeng, Shacman), construction equipment (loaders, graders, excavators), marine propulsion, agricultural machinery.

3. What are the key specifications of this nozzle?

5‑hole design, flow code 2344.
Compatible solenoid valve: F 00R J01 692.
Repair kit: F 00R J03 548.

4. What causes DLLA152P2344 nozzle failure?

Fuel contamination (water, lead, aluminum powder, iron powder, sulfide).
Normal wear from high‑temperature operation.
Needle wear leading to oil hole blockage.
Spring rust/fracture.
Needle valve lift gasket wear.
Nozzle cap cracking from thermal fatigue.

5. Can I replace just one nozzle on a Weichai WD10 engine?

Not recommended. Replace all six as a matched set to maintain cylinder balance and avoid fault codes.

6. How can I tell if my DLLA152P2344 nozzle is failing?

Symptoms: black smoke under load, reduced power, hard starting, rough idle, increased fuel consumption, external fuel leakage from nozzle cap.
A return flow (leak‑off) test can confirm internal wear.

7. Do I need a test stand to diagnose failure?

Basic diagnosis: leak‑off test identifies high return flow.
For spray pattern, needle wear, or opening pressure deviation: professional test stand (Bosch EPS 200 or similar) required.
Examine all components under microscope at least 20×.

9. Looking for DLLA152P2344 Nozzles?

We supply OEM‑quality replacement components for Bosch common rail systems.

Products available

DLLA152P2344 (0 433 172 344 / 0433172344) nozzles
Complete injector assembly 0 445 120 343 (Weichai 612640080031)
Solenoid valve: F 00R J01 692 (F00RJ01692)
Complete repair kit: F 00R J03 548 (nozzle, solenoid, gaskets)
Control valve sets and sealing components
New copper gaskets and nozzle tight caps

Service features

Competitive wholesale pricing
Worldwide shipping available
Technical support for installation and diagnosis
Bulk order discounts for distributors

For technical support, quotations, or wholesale inquiries, please contact our diesel injection specialists with your OEM part number for verification and fast quoting.

10. Conclusion

The Bosch DLLA152P2344 is a 5‑hole common rail nozzle for the Weichai WD10 series 9.726L Euro IV diesel engine.
Flow code 2344 delivers high fuel flow required for 170–320 HP output while maintaining proper atomization for Euro IV compliance.
Factory‑matched to injector assembly 0 445 120 343 (CRIN2‑16‑BL) and solenoid valve F 00R J01 692.

Key recommendations for service technicians working on Weichai WD10 engines:

Always verify injector assembly number (0 445 120 343) before ordering.
Use exact nozzle stamping: DLLA152P2344.
Replace all six nozzles as a full matched set.
Torque nozzle cap to manufacturer specification – do not over‑torque.
Use new copper gasket and replace tight cap after 5 disassemblies.
Prime fuel system properly after installation.
Perform test stand verification for spray pattern and return flow.
Use Weichai/Bosch diagnostic tools to reset injector codes if required.

Maintenance tips to maximize nozzle life:

Regular fuel filter changes.
Periodic leak‑off testing.
Use clean diesel meeting ASTM D975 or EN 590 standards.

Following these guidelines ensures reliable performance and prevents costly engine damage.

Disclaimer

Bosch and Cummins part numbers are used for compatibility and identification purposes only. All products described in this article are aftermarket replacement parts and are not claimed to be original Bosch or Cummins products unless explicitly stated.