BOSCH Four-Port Injector – 0445120270=0445120271=A4710700487=A47107004870080=0986435598 – The Complete Multi-Number Solution For OM471 Diesel Systems

In the global heavy-duty diesel ecosystem, a single precision component rarely carries a single identity. The Bosch four-port solenoid injector represented by the cross-reference string 0445120270, 0445120271, A4710700487, A47107004870080, and 0986435598 exemplifies this reality. These five numbers are not five different parts; they are five distinct "passports" for the same hydraulic core, issued by Bosch manufacturing, Mercedes-Benz OEM parts logistics, and the independent aftermarket. This injector serves as the fuel metering interface for a substantial portion of Mercedes-Benz OM471 engines, powering Actros, Antos, and Arocs trucks across multiple emissions generations. Understanding this number web is essential for workshops, fleet managers, and parts distributors who need to navigate the complex catalogues of multiple supply chains.

Our remanufacturing protocol applies uniformly across all five numbers in this cluster. We rebuild to the most comprehensive specification, ensuring that the injector performs to the OEM standard regardless of which number is on the label:

Complete disassembly and ultrasonic cleaning

Guide bore restoration via diamond honing to 0.1 µm Ra finish

Seat re-lapping to 0.15 µm Ra with correct angle

Solenoid validation – inductance, resistance, and insulation testing

Armature stroke calibration to 41-47 µm using laser interferometry

16-point flow testing spanning 200-1,800 bar

Leak-off verification under 1.4 ml/min at 1,600 bar

Spray pattern confirmation using high-speed imaging

500,000-cycle break-in to stabilise mechanical components

Each injector is shipped with a detailed test report documenting all measured parameters, providing full traceability.

Despite the numerical diversity, the hydraulic core of this injector remains absolutely consistent. All five numbers reference a four-port solenoid design with the following defining characteristics:

A control-piston geometry that provides a rapid pressure decay in the control chamber

A 7-hole nozzle with a 148° cone angle, calibrated for OM471 deep-bowl pistons

A needle lift of 41-47 µm, laser-set with ±2 µm precision

A solenoid coil with a nominal resistance of 0.22-0.26 Ω at 20°C

An operating pressure range extending from 200 bar to 1,800 bar

A spray penetration of 57-62 mm, optimised to reach the piston bowl's outer edges without wall-wetting

This engineering consistency is deliberate; Mercedes-Benz maintains a unified injector specification across multiple part numbers to ensure that its service network can replace an older injector with a newer one without requiring software updates or mechanical modifications.

Bench testing across all five numbers confirms identical performance:

Static Flow at 1,600 bar: 1,120 cc/min (1.0 ms reference pulse, 40°C fuel)

Dynamic Flow Linearity: < ±2.0% across the 0.3-2.5 ms pulse range

Internal Leakage: ≤ 1.4 ml/min at 1,600 bar

Opening Delay (12V): 0.85-1.05 ms (temperature-dependent)

Closing Delay: 0.45-0.60 ms

Needle Lift: 41-47 µm

Nozzle Configuration: 7 holes, 148° cone angle, 0.134 mm orifice diameter, laser-drilled with ±3 µm precision

Coil Resistance: 0.22-0.26 Ω at 20°C

Inductance: 0.38-0.42 mH at 1 kHz (slightly variant between 0270 and 0271)

Inter-Injector Flow Spread: ≤ 1.8% within a matched set

The Bosch aftermarket number 0986435598 is the service part reference used by independent distributors worldwide. This number appears in catalogues from Bosch itself, as well as in the systems of major aftermarket suppliers. The 0986435598 injector is manufactured on the same production lines as the OEM injectors, using the same materials, tolerances, and quality control processes. The difference is exclusively in the packaging and the distribution channel; the injector itself is identical to the 0445120270/0271 and the A-numbers.

Q1: I have the A4710700487 injectors installed. Can I use the 0986435598 number to order replacements?

A: Yes, 0986435598 is the Bosch aftermarket number for the identical injector. It is the same component manufactured to the same specification, sold through independent distribution channels. You can confidently order 0986435598 as a direct replacement for A4710700487.

Q2: What is the practical difference between 0445120270 and 0445120271? Does it affect engine performance?

A: The 0271 has a slightly lower coil inductance, which results in a marginally faster current rise (approximately 4-5% quicker). In practice, this difference is within the ECU's compensation range and does not produce a noticeable effect on engine performance. The 0271 may offer a slight advantage in older ECU installations with slower driver stages, but in modern OM471 engines, both are interchangeable.

Q3: The injector label shows A47107004870080, but my parts catalogue lists only A4710700487. Are they the same?

A: Yes, the "0080" is a production batch suffix that does not affect the injector's specification or interchangeability. The base number A4710700487 supersedes all batch-suffixed variants. You can use A4710700487 as the reference for ordering replacements.

Q4: Can I replace a single injector from this family without replacing all six?

A: Yes, single replacement is possible. However, the ECU's adaptation values for that cylinder will be reset or adjusted. For optimal performance, we recommend replacing all six injectors as a set to ensure uniform flow, leak-off, and spray characteristics. If a single replacement is unavoidable, match the class code as closely as possible to the original.

Q5: How do I confirm the correct class code for my engine's ECU?

A: The class code is printed on the original injector label. If the label is damaged or illegible, the code can be read using diagnostic software connected to the ECU. The class code tells the ECU which internal calibration table to apply; installing an injector with the wrong code will cause adaptation errors and rough running.

Q6: What is the typical service life for this injector family in line-haul service?

A: With regular fuel filtration maintenance and good fuel quality, these injectors typically provide 500,000-700,000 km of reliable service in line-haul applications. We recommend a leak-off test every 100,000 km. When the average leak-off exceeds 3.0 ml/min per injector, replacement or reconditioning is due.

 

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