Product Analysis: Diesel Fuel Injector A6510704987 – Compatible with Delphi for Mercedes Benz W204 / W212

1. Basic Specifications & Parameters

The Diesel Fuel Injector A6510704987 is a high‑precision solenoid‑type common rail injector designed to be compatible with Delphi systems as a direct alternative to the original Mercedes‑Bosch injectors. It is specifically engineered for Mercedes‑Benz OM651 diesel engines (4‑cylinder, 2.1L CDI) fitted in W204 C‑Class and W212 E‑Class vehicles. This injector meets OEM form, fit, and function for reliable, long‑service performance.

Key technical parameters:

• Part Number: A6510704987 (also written as 6510704987, A 651 070 49 87)

• Compatible System: Delphi common rail (DCRI) – can be used in OM651 engines originally equipped with Bosch or Delphi; please confirm vehicle build date.

• Injector Type: Solenoid‑controlled 7‑hole nozzle, high‑pressure common rail

• Engine Application: Mercedes‑Benz OM651 (2,143 cc, 2.1L inline 4‑cylinder, turbocharged, twin‑turbo variants)

• Maximum Injection Pressure: 1,800 bar (26,100 psi) – suitable for Euro 5 and Euro 6 OM651 versions

• Number of Nozzle Holes: 7 holes (asymmetrically arranged for precise spray targeting)

• Nozzle Hole Diameter: 0.108 – 0.122 mm (laser‑drilled, wear‑resistant)

• Static Flow Rate (nominal) : 450 – 490 cc/30 sec at 100 bar (test oil, 20°C)

• Coil Resistance: 0.85 – 1.15 Ω (at 20°C)

• Peak current: 18 – 22 A (opening), hold current 8 – 12 A (depending on ECU driver)

• Actuation voltage: 12V DC (peak & hold PWM from ECU)

• Body Material: High‑strength alloy steel, manganese phosphate coated for corrosion resistance

• Seal type: Needle and seat – hardened ball and taper design

• Return fuel flow (max, idle) : ≤ 0.5 cc/min

• High‑pressure connection: M14 x 1.5 threaded inlet with sealing cone

• Low‑pressure return: Banjo bolt connector (M12 x 1.5) with O‑ring sealing

• Mounting: Single hold‑down clamp with M6 bolt; torque 22 – 25 Nm + 90°

• Copper sealing washer: 14.5 mm OD x 9.5 mm ID x 1.5 mm (tapered for combustion seal)

Quality control:
Each injector is 100% checked on a common rail test bench:

• Coil resistance and inductance (solenoid integrity)

• Leak test (high pressure 1,800 bar, low pressure 5 bar)

• Flow linearity over 5 pressure points (200, 400, 800, 1200, 1600 bar)

• Return flow measurement (must be ≤0.5 cc/min at idle condition)

• Spray pattern analysis (7 plumes, equal distribution, no dribble)

• Pilot injection accuracy (for noise reduction)

2. Compatible Engines & Vehicle Models

The A6510704987 injector is designed for Mercedes‑Benz OM651 diesel engines, which power a wide range of passenger cars and light commercial vehicles. This injector suits models originally equipped with either Bosch or Delphi injection systems – always verify by VIN or original injector part number.

Engine family:

• OM651 – 2,143 cc, inline 4‑cylinder, 16‑valve, common rail, turbocharged (single or twin turbo). Power outputs from 100 kW (136 hp) to 150 kW (204 hp). Production years approx. 2008–2016 (Euro 5 and early Euro 6).

Specific vehicle models (compatible with A6510704987):

• Mercedes‑Benz C‑Class (W204) – C200 CDI, C220 CDI, C250 CDI (2008–2014)

• Mercedes‑Benz E‑Class (W212) – E200 CDI, E220 CDI, E250 CDI (2009–2015)

• Mercedes‑Benz S‑Class (W221) – S250 CDI (some markets, 2010–2013)

• Mercedes‑Benz GLK‑Class (X204) – GLK220 CDI, GLK250 CDI (2010–2015)

• Mercedes‑Benz Sprinter (906) – 213/216/219 CDI (2.1L OM651 engine, model year 2009–2017)

• Mercedes‑Benz Viano / Vito (W639) – Viano 2.1 CDI, Vito 113/114/116 CDI (2009–2014)

Important compatibility notes:

• The OM651 engine may use different injectors depending on Euro standard (Euro 5 vs. Euro 6), power level, and injection system supplier (Bosch or Delphi).

• A6510704987 is a Delphi‑compatible injector. It is a direct fit for vehicles that originally had Delphi injectors (part numbers starting with A651070...). For vehicles originally with Bosch injectors (e.g., 0445110xxx), this injector may NOT be plug‑and‑play – the ECU calibration and coding values differ. Always check your original injector part number or contact Rsolid support.

• Injector coding (IQA) is mandatory for OM651 engines. Each injector has an IQA (Individual Quantity Adjustment) code printed on the body (a 6‑digit alphanumeric code). This code must be programmed into the ECU using a diagnostic tool (e.g., Xentry/DAS, Delphi diagnostic tool, Autel, Launch). Without coding, the engine will run roughly, produce smoke, and may go into limp mode.

• For some Euro 6 OM651 engines (2014+), the system may require Injector ID verification – our technical support team can assist with the procedure.

3. Performance Advantages & Functional Improvements

Installing a premium aftermarket A6510704987 injector (Delphi compatible) from Rsolid Engine Parts delivers significant improvements over worn or poorly refurbished injectors:

• Restored Power & Torque – OM651 engines are sensitive to injector wear. Old injectors develop internal leakage, reduced opening speed, and nozzle coking, leading to low power (especially at low RPM) and turbo lag. New injectors restore factory power (e.g., 150 kW / 204 hp for C250 CDI) and torque (up to 500 Nm). Customers report a 20% power recovery on high‑mileage vehicles.

• Fuel Economy Gains – Worn injectors often cause over‑fueling or incorrect injection timing. Our precision‑calibrated injectors reduce fuel consumption by 6–12% in real‑world driving, saving hundreds of euros/dollars per year.

• Smoke & Emissions Elimination – The 7‑hole asymmetrical nozzle produces extremely fine atomization (SMD < 20 μm), eliminating black smoke under hard acceleration and reducing particulate emissions. Helps clear MOT/emissions test failures.

• Smoother Idle & Reduced Noise – New injectors restore precise pilot injection (pre‑injection) which dramatically reduces diesel knock and vibration. OM651 engines are known for rough idle when injectors age – our injectors make them “butter smooth”.

• Excellent Cold Start Performance – Worn injectors cause long cranking times, especially below 5°C. Our injectors have fast solenoid actuation (≤0.25 ms rise time) and tight sealing, ensuring reliable starting down to -25°C.

• Elimination of Common OM651 Injector Failures – This injector resolves:

• High return flow (leaking needle seat) – common cause of “long crank” and fuel dilution of oil

• Sticking solenoid (irregular misfire codes P0262–P0265)

• Nozzle coking (uneven spray causing cylinder knock)

• Copper washer leakage (combustion gases entering fuel system)

• Compatibility with Biodiesel (B7, B10) – The hardened ball/seat and special needle coating resist corrosion and wear from modern biofuel blends, which are known to damage older injector designs.

• Long Service Life – With proper fuel filtration (regular replacement of the OM651 fuel filter), these injectors can last 200,000 km+ in normal mixed driving.

Installation & Coding Instructions (Crucial):

1. Remove old injectors carefully – clean the bore thoroughly.

2. Always fit new copper sealing washers and new return line O‑rings.

3. Torque hold‑down bolt to 22–25 Nm + 90° (use an angle gauge).

4. After installation, prime the system (key on/off several times or use scan tool).

5. Start engine and check for leaks.

6. Injector coding is mandatory:

• Write down the 6‑digit IQA code printed on each new injector.

• Use a diagnostic tool (Xentry, Autel MaxiSys, Launch X431, or Delphi diagnostic).

• Navigate to OM651 engine ECU (CDI4 or CDI4.1) -> adaptations -> injector coding.

• Enter the 6‑digit code for each cylinder in the correct order.

• Save and clear any fault codes.

• Some ECUs require a “learn” drive cycle (10–15 minutes of mixed driving).

7. If your vehicle originally had Bosch injectors, coding may not be sufficient; the ECU software may need to be flashed – consult Rsolid support before purchase.

4. Why Choose Rsolid Engine Parts for This Common Rail Injector?

Rsolid Engine Parts (www.rinjector.com) is a leading global supplier of diesel fuel injection components. When you purchase the A6510704987 (Delphi compatible) from us, you benefit from:

• Premium Aftermarket Quality – Our injectors are manufactured in IATF 16949 and ISO 9001:2015 certified facilities using OE‑grade materials and processes. No used, rebuilt, or counterfeit units – 100% new.

• 100% Tested Before Shipping – Every injector is fully tested on a modern common rail test bench (e.g., Hartridge or Delphi bench). Test reports are available on request.

• Exact OEM Compatibility – Our injectors match Delphi specification for OM651 engines. We provide IQA codes on every unit for easy ECU coding.

• Competitive Pricing – Factory direct means 40–60% savings compared to Mercedes‑Benz dealer prices or genuine Bosch/Delphi, without sacrificing reliability.

• Fast Global Delivery – Large inventory ready to ship. Order single injectors, sets of 4, or bulk for workshops. Express shipping via DHL, FedEx, UPS – delivery 3–7 days worldwide.

• Expert Technical Support – Not sure about compatibility (Delphi vs. Bosch) or coding? Our diesel injection specialists are available 24/7 via WhatsApp: +8615975376778 to help you identify your engine, read IQA codes, and guide you through installation.

• Warranty – 12‑month or 100,000 km warranty (whichever comes first) against manufacturing defects, solenoid failure, or nozzle blockage under normal use with proper fuel filtration.

• Complete Solution – We also supply new copper washers, return line kits, fuel filters, and OM651 common rail pumps.

Visit www.rinjector.com to browse our full range of injectors for Mercedes, BMW, Audi, VW, PSA, Ford, and more. For urgent needs, WhatsApp +8615975376778 with your vehicle VIN or injector part number.

92谱