Based on the part number **0442624636**, this is a specific component typically associated with **Bosch** diesel injection systems. Specifically, it refers to a **Common Rail Injector Valve Set** (also known as a F00RJ01692 equivalent in some catalogs). These components are critical in modern electronic diesel control (EDC) systems. --- ### 1. Component Overview The part consists of a valve assembly that controls the high-pressure fuel flow within a diesel injector. In an electronic fuel injection system, this part acts as the mechanical interface between the electronic solenoid (actuator) and the hydraulic nozzle. ### 2. Technical Specifications | Feature | Description | | :--- | :--- | | **Manufacturer** | Bosch (Commonly) | | **System Type** | Common Rail Direct Injection (CRDI) | | **Main Material** | High-strength Alloy Steel / Tungsten Coating | | **Function** | Pressure regulation and fuel metering | | **Application** | Heavy-duty trucks, Industrial engines (e.g., Cummins, IVECO) | --- ### 3. Electronic & Mechanical Interaction While the part itself is a precision mechanical valve, it is the heart of the **Electronic Injector**. Here is how the electronic parts interact: 1. **Solenoid Actuation:** The Engine Control Unit (ECU) sends a high-voltage pulse (60V–90V) to the injector's solenoid coil. 2. **Valve Lift:** The magnetic field created by the coil lifts the valve ball inside this component (**0442624636**). 3. **Pressure Drop:** Lifting the valve allows fuel to escape from the control chamber to the return line. 4. **Injection:** The drop in pressure above the nozzle needle causes it to lift, spraying fuel into the cylinder. ### 4. Common Failure Symptoms When this specific part wears out or fails, it leads to issues in the electronic management system: * **High Back-Leakage:** Too much fuel returns to the tank, preventing the rail from reaching starting pressure. * **DTC Codes:** The ECU may throw codes like `P0087` (Fuel Rail Pressure Too Low). * **Hard Starting:** The engine fails to start when hot because the valve cannot seal properly. --- ### 5. Cross-Reference Table | Brand | Part Number | | :--- | :--- | | **Bosch** | 0 442 624 636 | | **Alternative** | F 00R J01 692 | | **Compatible Injectors** | 0445120xxx series |