0445120287
BOSCH 0445120287 Common Rail Injector for Mercedes-Benz Actros MP4 / Antos & Detroit DD13 12.8L
A4710700587, 4710700587, A4710700387, 4710700387, A4710700588, 4710700588, 4710780245, 4710701187, 4710701287, A471070058780F00RJ14012DLLA118P22032100 barProduct Overview
The Bosch 0445120287 is a heavy-duty CRIN common rail diesel fuel injector engineered for high-output commercial powertrains, including the Mercedes-Benz OM 471 LA, OM 470 LA, and Detroit Diesel DD13/DD15 platforms. Operating at dynamic injection pressures up to 2100 bar, this solenoid-driven injector provides micro-second multi-pulse metering to support pilot, main, and post-injection combustion strategies. The internal hydraulic architecture utilizes nozzle 0433171878 and control valve F00RJ14012 to optimize fuel atomization and spray geometry across all engine operating points. Designed for Euro 5 and Euro 6 emissions compliance, the unit ensures reduced particulate output, minimized NOx formation, and optimal fuel economy under demanding duty cycles.
Technicians must cross-reference the injector body part number against the engine build plate data and enter the unique factory-calibrated alphanumeric IMA classification code into the engine control unit (ECU) prior to startup to prevent severe cylinder imbalance and rough running.
Vehicle & Engine Fitment
| Vehicle | Engine | Years |
|---|---|---|
| Mercedes-Benz Actros MP4 / Antos / Arocs 12.8D | Detroit Diesel DD13 / DD15 (Mercedes-Benz OM 471 12.8L) | 2011-2022 |
| Setra ComfortClass / TopClass 400 / 500 | Detroit Diesel DD13 / DD15 (Mercedes-Benz OM 471 12.8L) | 2011-2022 |
| Freightliner Cascadia 12.8D | Detroit Diesel DD13 / DD15 (Mercedes-Benz OM 471 12.8L) | 2011-2022 |
| Western Star 4700 / 4900 12.8D | Detroit Diesel DD13 / DD15 (Mercedes-Benz OM 471 12.8L) | 2011-2022 |
Technical Specifications
| Specification | Value |
|---|---|
| SKU | 0445120287 |
| Brand | BOSCH |
| Product Type | Complete Solenoid Common Rail Injector Assembly |
| Control ValveCore Spec | |
| Nozzle CodeCore Spec | |
| Engine Family | Mercedes-Benz OM 471 / Detroit DD13 (12.8L) |
| Operating PressureCore Spec | |
| Emission Standard | Euro 5 / Euro 6 |
| Seal Ring Kit | F00RJ02176 |
Installation Tips
- Always utilize the mandatory two-wrench counter-hold technique during high-pressure line installation: secure the injector inlet fitting hex with an open-end wrench while tightening the high-pressure fuel line union nut to exactly 35 N·m to prevent rotational deflection and internal valve spindle shear damage. Torque the hold-down clamp bolt to exactly 20 N·m + 90° using a calibrated torque wrench and angle indicator.
- Clean the cylinder head injector bore down to bare metal using specialized non-abrasive brass bore cleaning tools, ensuring the lower sealing surface is entirely free of carbon buildup. Install a new copper crush ring from seal ring kit F00RJ02176 and apply a thin coating of high-temperature metal-free ceramic anti-seize paste strictly to the injector body shaft, ensuring no paste contacts the nozzle tip or fuel discharge orifices.
- Program the unique multi-digit IMA trim code into the engine management system via a diagnostic scan tool to calibrate individual cylinder delivery profiles. Prior to initial starter engagement, manually prime and purge the low-pressure fuel supply circuit to eliminate entrained air and prevent dry-running friction wear within the internal hydraulic metering components.
Frequently Asked Questions
What is the OE cross-reference for this injector?
This injector matches original equipment (OE) manufacturer part numbers A4710700587, 4710700587, A4710700387, 4710700387, A4710700588, 4710700588, 4710780245, 4710701187, 4710701287, and A471070058780 for Mercedes-Benz and Detroit Diesel heavy-duty commercial applications.
What control valve / actuator is used?
This common rail injector utilizes control valve F00RJ14012 paired with nozzle 0433171878. The solenoid magnet assembly is factory-integrated into the injector body and is not serviced as an individual standalone SKU.
Does this injector require ECU IMA coding?
Yes, entering the individual IMA (Injector Quantity Adjustment) code into the vehicle ECU is mandatory. This alphanumeric calibration code corrects for minute manufacturing tolerances and ensures accurate fuel delivery quantities across pilot, main, and post-injection events.
What are the common failure symptoms and associated DTC codes?
Failure symptoms include extended cranking times, engine misfires under load, power loss, and excessive exhaust smoke. Typical diagnostic trouble codes include P0087 (fuel rail pressure too low, caused by internal erosion of control valve F00RJ14012 leading to high return leakage), electrical circuit codes P0201-P0204 (injector circuit open/short), and cylinder balancing deviation codes such as P1011/P1012.
What are the proper installation torque specifications?
The high-pressure fuel line union nut requires an exact torque of 35 N·m with the inlet fitting securely counter-held. The injector hold-down clamp bolt must be torqued to exactly 20 N·m + 90°.
How do you perform a dynamic back-leakage flow bench test?
Mount the injector on a certified high-pressure common rail test bench capable of 2100 bar operation and evaluate return fuel quantity across distinct pressure maps. Acceptable bench test thresholds are idle back-leakage <= 35 ml/min and full-load leak-off <= 50 ml/min; excessive volume denotes high-pressure seat wear on control valve F00RJ14012.
What is the acceptable solenoid coil electrical resistance?
At an ambient temperature of 20°C, the solenoid coil electrical resistance across the terminals must measure within 0.25-0.50 ohms. Terminal-to-ground isolation resistance must also be tested with a megaohmmeter to confirm no internal winding insulation breakdown to the injector body shaft.
Why is the two-wrench installation procedure strictly mandatory?
The two-wrench counter-hold procedure prevents tightening torque from transferring from the line nut into the injector assembly. Torquing the line to 35 N·m without counter-holding the inlet fitting risks internal structural misalignment, spindle shearing, and hydraulic seat damage affecting nozzle 0433171878.
Diagnostic Trouble Codes & Fault Protocols
Common diagnostic trouble codes (DTCs) triggered when this common rail injector experiences wear, circuit faults, or calibration drift:
Fuel Rail / System Pressure Too Low
Excessive internal backleak from worn control valve seats drops common rail pressure below target under engine load.
Injector Circuit Malfunction / Open Circuit
Solenoid coil resistance drift (0.2-0.5 Ω) or piezo stack degradation triggers driver stage shutdown on affected cylinders.
Cylinder Misfire & Balancing Deviation
Carbon-clogged nozzle spray holes or missing IMA calibration causes uneven cylinder contribution. Recode ECM and verify washer seating.
Fuel Rail / System Pressure Too High
Spill line backpressure or stuck metering valve prevents rail depressurization, creating overpressure risks under load.
Cross-Reference & Compatibility
Sister parts, same-platform variants, and known incompatibilities.
Technical Diagnostic & Service Protocols
Authoritative field procedures, diagnostic testing thresholds, and service SOPs for this assembly.