0445120385
0445120385 Injector: Detroit DD13 Mercedes OM471 Specs
A4710700887, 4710700887, A4710700187, A4710700287, A4710700387, A4710700487, EA4600700687, RE4600700687, RA4710700887F00RJ14012F00VX500592100 barProduct Overview
The BOSCH 0445120385 is an authentic OEM heavy-duty common rail fuel injector (CRIN4.2 generation with X-Pulse pressure amplification technology) calibrated for 12.8L Detroit Diesel DD13 (EPA10/GHG14/GHG17) and European Mercedes-Benz OM471 Euro 6 heavy-duty commercial transport engines. Operating at a peak rail pressure of 2100 bar (hydraulically amplified up to 2400-2500 bar at the nozzle seat), it incorporates genuine Bosch nozzle assembly F00VX50059 and micro-second electromagnetic valve actuation. It supersedes older Bosch units 0445120194 and 0445120195, pairs with twin unit 0445120386, and replaces Daimler / Detroit OEM references A4710700887, 4710700887, A4710700187, A4710700287, A4710700387, A4710700487, factory remanufactured OE EA4600700687 / RE4600700687 / RA4710700887, and Bosch Exchange units 0986435647 and 0986435642. Program the individual injector calibration code into the Detroit DDEC or Mercedes MCM engine control module upon installation to maintain strict cylinder balancing.
Always verify the OEM part number A4710700887 / 4710700887 on the injector collar before installation. Bosch 0445120385 is the latest-generation heavy-duty common rail fuel injector calibrated exclusively for 12.8L Detroit Diesel DD13 and Mercedes-Benz OM471 Euro 6 commercial transport platforms. Do NOT interchange with 14.8L DD15 injectors (0445120104/0445120207). Injector clamp bolts are Torque-To-Yield (TTY) stretch fasteners and MUST be replaced with new bolts torqued to 20 N·m (15 lb·ft) + 90°.
Vehicle & Engine Fitment
| Vehicle | Engine | Years |
|---|---|---|
| Mercedes-Benz Actros MP4 / Antos / Arocs 1842 / 1845 / 1848 / 1851 | Detroit Diesel DD13 / DD15 (Mercedes-Benz OM 471 12.8L) | 2011-2021 |
| Freightliner Cascadia / Coronado / 114SD 12.8L | Detroit Diesel DD13 / DD15 (Mercedes-Benz OM 471 12.8L) | 2011-2021 |
| Western Star 4700 / 4800 12.8L | Detroit Diesel DD13 / DD15 (Mercedes-Benz OM 471 12.8L) | 2011-2021 |
| Setra TopClass / ComfortClass 500 | Detroit Diesel DD13 / DD15 (Mercedes-Benz OM 471 12.8L) | 2012-2021 |
Technical Specifications
| Specification | Value |
|---|---|
| SKU | 0445120385 |
| Brand | Mercedes-Benz / Freightliner / Western Star / BOSCH |
| Type | Complete Injector Assembly (Bosch Common Rail (CRIN4.2 / X-Pulse Amplified solenoid)) |
| OE Number | A4710700887, 4710700887, A4710700187, A4710700287, A4710700387, A4710700487, EA4600700687, RE4600700687, RA4710700887 |
| Nozzle CodeCore Spec | |
| Control ValveCore Spec | |
| Injection System | Bosch Common Rail (CRIN4.2 / X-Pulse Amplified solenoid) |
| Operating PressureCore Spec | |
| Torque Spec | 40 N·m |
| Hold Down Torque | 20 N·m + 90° |
| Warranty | 12 Months |
| Emission Standard | Euro 6 / EPA10 |
| Engine Family | Detroit DD13 & Mercedes-Benz OM471 (12.8L) |
| Coding Required | Yes (IMA / Calibration Code) |
Installation Tips
Tools needed: Detroit Diesel J-48770 high-pressure line socket or open-end torque crowfoot wrench, Torque angle gauge / digital angle torque wrench (20 N·m + 90° capacity), Clean brass injector bore brush and shop vacuum extraction kit, Detroit Diagnostic Link (DDDL) or Mercedes-Benz Xentry diagnostic tool
- Thoroughly clean the cylinder head injector bore using a brass bore brush and vacuum extraction; inspect the lower sealing sleeve for pitting, fretting, or residual copper washer fragments.
- Discard used hold-down clamp stretch bolts. Install a brand-new copper crush washer onto the injector tip, applying a light film of clean engine oil or high-temperature ceramic anti-seize paste to the injector body (strictly avoiding the nozzle tip and spray orifices).
- Insert injector 0445120385 vertically into the bore until properly seated; hand-start the hold-down clamp bolt to ensure alignment with the rocker arm assembly.
- Hand-thread the high-pressure fuel line cap nuts onto the injector inlet and rail fitting until finger-tight to prevent thread cross-alignment.
- Torque the brand-new hold-down clamp bolt to exactly 20 N·m (15 lb·ft), then apply a continuous 90° angle turn using a calibrated torque angle gauge.
- Torque the high-pressure fuel line cap nuts to 40 N·m (29 lb·ft) using tool J-48770 or an open-ended torque crowfoot wrench while counter-holding the injector fitting.
- Connect the electrical solenoid harness terminals and tighten the retaining nuts to 1.5 N·m (1 lb·ft). Do not over-torque to prevent terminal post fracture.
- Torque the injector wiring harness allen head bracket screws to 10 N·m (7 lb·ft).
- Reinstall the rocker cover and torque all cover bolts in an alternating cross pattern to 20 N·m (15 lb·ft).
- Connect Detroit Diagnostic Link (DDDL) or Mercedes Xentry; program the 6-digit injector calibration code printed on the injector body into the respective cylinder slot, prime the low-pressure fuel circuit, and verify zero fuel rail leakage under high idle.
- Critical TTY Bolt Mandate: Detroit DD13 injector clamp bolts are torque-to-yield fasteners engineered to stretch during the final 90° step. Reusing old bolts causes clamp load relaxation, combustion gas blowby, and damaged injector cups.
- High-Pressure Line Counter-Holding: Always use the factory service crowfoot tool J-48770 when torquing the line nut to 40 N·m. Uneven side loading can shear internal alignment pins and trigger rail pressure fault codes (P0087).
- Solenoid Terminal Caution: The M4 electrical studs are delicate. Tighten strictly to 1.5 N·m (13 lb·in). Over-tightening will snap the stud inside the solenoid housing, requiring complete injector replacement.
- DDEC Calibration Coding: Failure to update the injector calibration code in DDDL after replacement results in rough idle, cylinder cutout test deviations, and premature DPF regeneration cycles.
Frequently Asked Questions
What engines use Bosch injector 0445120385?
Bosch 0445120385 is calibrated for 12.8L Detroit Diesel DD13 (EPA10 / GHG14 / GHG17) and European Mercedes-Benz Actros MP4, Antos, and Arocs heavy-duty commercial transport trucks equipped with OM471 Euro 6 engines.
What is the OEM part number for 0445120385?
The primary Daimler / Detroit OEM reference is A4710700887 (or 4710700887). Other factory superseded part numbers include A4710700187, A4710700287, A4710700387, A4710700487, and OE remanufactured numbers EA4600700687, RE4600700687, and RA4710700887.
Is 0445120385 interchangeable with 0445120194?
Yes. Bosch 0445120385 is the updated superseding generation for 0445120194 (and 0445120195). Both injectors share identical physical dimensions, F00VX50059 nozzle specifications, and 2100 bar CRIN4.2 operating pressure, and can be used as direct drop-in replacements.
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.
Technical Diagnostic & Service Protocols
Authoritative field procedures, diagnostic testing thresholds, and service SOPs for this assembly.