BOSCH Four-Port Injector – 0445120287=0445120288=0986435624=A4710700587=A4710700387=A4710700588=A4710780245=A4710701187=A4710701287 – The Definitive Replacement For Mercedes OM471

In the world of heavy-duty diesel, few components carry as many identities as the Bosch four-port injector for the Mercedes-Benz OM471 engine family. The extensive cross-reference string – 0445120287, 0445120288, 0986435624, A4710700587, A4710700387, A4710700588, A4710780245, A4710701187, and A4710701287 – is not a collection of different injectors. It is a unified hydraulic specification that has been certified, recertified, and superseded across a full decade of truck production, emissions regulation changes, and service network adaptations. This single injector serves as the fuel metering heart for Actros, Antos, and Arocs trucks from Euro-5 through Euro-6 Stage C, providing consistent, reliable fuel delivery regardless of which number is stamped on the housing or printed on the service invoice.

The proliferation of part numbers for this injector arises from the layered structure of commercial vehicle supply chains. Bosch, the manufacturer, assigns its own service numbers – 0445120287 and 0445120288 – which reflect minor production batch characteristics such as solenoid coil insulation type and spring preload variants. These two numbers are functionally interchangeable, with the 0287 offering a slightly lower temperature coefficient of resistance for improved hot-climate performance. The 0986435624 is Bosch's aftermarket catalogue number, used primarily in European and Asian service networks. The A-prefixed numbers belong to Mercedes-Benz's proprietary part numbering system, with each number corresponding to a specific production period, emissions standard, or ECU software version:

A4710700587 – Early OM471 Euro-5 (2011-2014)

A4710700387 – Mid-production OM471 Euro-5 (2014-2016)

A4710700588 – Transitional OM471 Euro-6 (2016-2018)

A4710780245 – OM471 Euro-6 Stage B

A4710701187 – OM471 Euro-6 Stage C (2018-2020)

A4710701287 – OM471 Euro-6 Stage C (2020-2022, current supersession)

Despite the numerical diversity, every injector in this family shares identical hydraulic characteristics: the same flow rate, spray angle, nozzle configuration, needle lift, and control-chamber geometry. Mercedes-Benz deliberately maintained this consistency to ensure backward compatibility across their service network, allowing workshops to replace an older A-number injector with a newer one without any software or hardware modifications.

The Mercedes-Benz OM471 is a 12.8-litre inline-six diesel engine that powers the Actros (long-haul), Antos (distribution), and Arocs (construction and heavy-haulage) truck ranges. It features a Bosch CP3.2 high-pressure pump delivering up to 1,800 bar rail pressure, with injection strategies that employ up to five pulses per combustion cycle – pilot, pre, main, post, and after-post – to reduce noise and emissions while improving fuel economy. The injector's four-port throttle design, combined with a 7-hole nozzle (148° cone angle, 0.135 mm orifice diameter), is calibrated specifically for the OM471's deep-bowl piston geometry, producing a spray penetration of 58-63 mm that ensures optimal air-fuel mixing without impinging on the cylinder liner.

Static Flow at 1,600 bar: 1,140 cc/min (1.0 ms reference pulse, 40°C fuel)

Dynamic Flow Linearity: < ±1.9% across 0.3-2.5 ms pulse range

Internal Leakage: ≤ 1.3 ml/min at 1,600 bar

Opening Delay (12V): 0.85-1.05 ms

Closing Delay: 0.45-0.60 ms

Needle Lift: 42-48 µm, laser-verified

Nozzle Configuration: 7 holes, 148° cone angle, 0.135 mm diameter, laser-drilled ±3 µm

Coil Resistance (20°C): 0.22-0.26 Ω

Operating Pressure Range: 200-1,800 bar

Temperature Range: -30°C to 150°C (body temperature)

Connector Type: 2-Pin ISO 8092

The inter-injector flow spread within a matched set is maintained at ≤ ±1.5%, ensuring that cylinder-to-cylinder corrections remain small and the ECU's adaptation headroom is preserved for future wear.

Mercedes-Benz's supersession path is linear: A4710700587 → A4710700387 → A4710700588 → A4710780245 → A4710701187 → A4710701287. The current active service number is A4710701287, which supersedes all previous A-numbers in this family. The Bosch numbers 0445120287 and 0445120288 remain active in the independent aftermarket, while 0986435624 serves as the primary catalogue number in many European and Asian service networks. When ordering, any number from this cross-reference group will deliver the same injector – the supersession chain ensures that workshops can confidently replace an older injector with a newer one without any calibration or compatibility concerns.

Q1: I have a 2015 Actros with A4710700387 injectors. Can I replace them with A4710701287 without changing the ECU?

A: Yes, A4710701287 supersedes A4710700387 and all earlier A-numbers. The ECU calibration is compatible across the entire supersession chain. However, we strongly recommend resetting the adaptation values after installation – this allows the ECU to learn the new injectors' characteristics from a clean baseline, reducing the learning time from 200 cycles to approximately 50 cycles.

Q2: What is the actual difference between 0445120287 and 0445120288? Which one should I order for a truck operating in the Middle East?

A: The 0287 uses a high-temperature coil insulation that provides better thermal stability at coil temperatures above 140°C. For Middle Eastern operation, we recommend the 0287. For European or North American operation, either number is equally suitable. If the 0288 is more readily available and cost-effective, it will perform perfectly in temperate climates.

Q3: Can I install just one injector from this family to replace a failed unit, or do I need to replace all six?

A: You can replace a single injector, but the ECU will apply a correction value that reflects the difference between the new and old injectors. For optimal performance, we recommend replacing all six injectors as a set – this ensures uniform flow and leak-off characteristics, minimising cylinder-to-cylinder corrections. If a single replacement is unavoidable, match the injector class code as closely as possible to the original unit.

Q4: I have replaced the injectors but the engine still has a rough idle. What else could be wrong?

A: Rough idle after injector replacement on the OM471 is often caused by air in the high-pressure system, incorrect adaptation reset, or a leaking copper sealing washer. Verify that the adaptation values have been reset, that the system has been properly primed (ignition cycling), and that the copper washers are new and torqued correctly. If the issue persists, check the rail pressure sensor and the fuel pressure control valve.

Q5: How do I determine which class code my OM471 requires for these injectors?

A: The class code (e.g., "C1," "D2," "E3") is printed on the original injector label. If the label is illegible, the class code is stored in the ECU and can be read using diagnostic software. The class code tells the ECU which internal calibration table to use for the injector. Installing an injector with the wrong class code will cause the ECU to apply incorrect pulse-width corrections, leading to rough running. Our injectors are supplied with the correct class code for your engine based on the VIN.

Q6: What is the expected service life of these injectors in a line-haul OM471 application?

A: With regular fuel filter maintenance (every 30,000-40,000 km) and good fuel quality, these injectors typically deliver 600,000-800,000 km in line-haul service. We recommend a leak-off test every 100,000 km to monitor wear progression. When the average leak-off exceeds 3.0 ml/min per injector, the injector is nearing the end of its service life and should be replaced or reconditioned.

 

To make your purchasing experience smooth and easy, we offer a variety of secure payment options:

We're here to make your order process worry-free - choose the payment method that works best for you!

 

 

Hot Tags: bosch four-port injector – 0445120287=0445120288=0986435624=a4710700587=a4710700387=a4710700588=a4710780245=a4710701187=a4710701287 – the definitive replacement for mercedes om471, China bosch four-port injector – 0445120287=0445120288=0986435624=a4710700587=a4710700387=a4710700588=a4710780245=a4710701187=a4710701287 – the definitive replacement for mercedes om471 manufacturers, suppliers, factory