CP3 Common Rail Pump 0445010244 – Bosch Compatible for Mercedes-Benz W212 E350 CDI & OM642 Diesel Engines | Rsolid Engine Parts

Mercedes-Benz diesel engines, particularly the renowned OM642 V6, demand a fuel injection pump that delivers consistent, high-pressure fuel across all operating conditions. The CP3 common rail pump 0445010244 – fully compatible with Bosch CP3 architecture – is the direct OE replacement for the W212 E350 CDI, W164 ML350 CDI, and other Mercedes models equipped with the 3.0L OM642 V6 turbo diesel. This pump restores smooth idling, eliminates hesitation under load, and ensures reliable cold starts. Rsolid engine parts supplies this precision component with 100% calibration testing and a 12-month warranty.

1. Structural Advantages of the CP3 0445010244 Injection Pump

The Bosch CP3 pump is a proven, durable design used extensively in European and American diesel engines. The 0445010244 variant matches Mercedes-Benz OEM specifications with the following engineering strengths:

• Three‑Plunger Radial Piston Design – Three plungers mounted radially around an eccentric cam deliver exceptionally smooth, high‑volume fuel flow with minimal pressure ripple. This reduces noise and stress on the common rail and injectors.

• Separate Fuel Lubrication System – Unlike CP4 pumps that rely solely on fuel lubrication, the CP3 uses engine oil (via a small internal passage or external line) to lubricate the cam and bearings, dramatically increasing durability and tolerance to contaminated diesel.

• High‑Capacity Internal Supply Pump (Transfer Pump) – An integrated low‑pressure vane pump draws fuel from the tank and supplies it to the high‑pressure plungers, eliminating the need for an external lift pump on most Mercedes applications.

• Robust Cast Iron Housing – Provides excellent vibration damping and heat dissipation, critical for V6 engines mounted transversely or longitudinally.

• Direct Bosch Compatibility – Identical mounting flange (SAE A), drive gear interface, high‑pressure outlet, electrical connector for the fuel pressure regulator, and oil feed port as the original Bosch 0445010244.

2. Compatible Mercedes-Benz Models (≤5)

This pump is specifically calibrated for the Mercedes OM642 3.0L V6 CDI engine family (Euro 4, 5, and early Euro 6). Common applications include:

• Mercedes-Benz E-Class W212 E350 CDI (2009–2014, OM642.850 / OM642.852)

• Mercedes-Benz ML-Class W164 ML350 CDI (2005–2011, OM642.940)

• Mercedes-Benz GL-Class X164 GL350 CDI (2006–2012, OM642.940)

• Mercedes-Benz R-Class W251 R350 CDI (2007–2012, OM642.850)

• Mercedes-Benz Sprinter 3.0 CDI (906 series, 2010–2016, OM642.896)

✅ Always confirm your engine code (OM642) and the original Bosch pump number. The 0445010244 is often found on the pump nameplate. Some later OM642 engines use CP4 pumps – verify before ordering.

3. Common Failures & Installation/Replacement Advice

Typical Symptoms of a Failing CP3 0445010244 Pump:

• Prolonged cranking, especially when hot – Common sign of internal wear or fuel pressure regulator (ZME) failure.

• Loss of high‑RPM power – The pump cannot maintain required rail pressure above 3,500 RPM.

• DTCs P0087, P0088, P0251 – Rail pressure too low, too high, or pump metering control fault.

• Diesel smell in engine oil – Internal seal failure (rare on CP3 but possible) allows fuel to enter the crankcase.

• Metallic debris in the fuel filter – Can still occur on CP3 pumps, though less frequent than CP4.

Professional Installation & Replacement Recommendations:

• Replace the fuel pressure regulator (ZME) at the same time – On OM642 engines, the regulator (located on the pump or on the rail) often fails first and damages the pump. Install a new Bosch ZME.

• Flush the entire fuel system – Remove and clean the fuel tank, replace all fuel hoses, and install a new fuel filter. CP3 pumps are more tolerant, but debris will still reduce life.

• Replace the engine oil and filter after installation – If diesel has leaked into the oil, it will reduce lubrication and damage bearings. Perform an oil change within 50 km of pump replacement.

• Prime the system before starting – Use a vacuum primer on the fuel return line to pull fuel through the pump. CP3 pumps are self‑priming but dry cranking can score the vane pump.

• Torque high‑pressure connections to spec – Outlet to rail: M14 × 1.5 cone seal at 35–40 Nm. Low‑pressure inlet and outlet: 25 Nm.

• Check the oil supply line – OM642 CP3 pumps receive engine oil via a dedicated line. Ensure it is not clogged; otherwise, cam and bearings will fail quickly.

• Reset adaptation values – Using Mercedes XENTRY or a high‑end diagnostic tool (e.g., Launch, Autel), perform a “fuel system adaptation reset” and then run the “high‑pressure pump teach‑in” routine.

• Inspect the drive gear – The pump is gear‑driven from the timing chain. Check for worn teeth or excessive backlash.

💡 Pro Tip: The OM642 engine is sensitive to fuel pressure variations. After replacing the pump, monitor actual rail pressure vs. specified using a scan tool. It should track within ±20 bar at all RPMs.

4. Why Choose Rsolid Engine Parts?

• Exact Bosch CP3 Compatibility – Direct replacement for Mercedes OM642 with no modifications.

• 100% Calibration Tested – Every pump is run on a Bosch EPS 200 or equivalent test bench. Delivery volume, pressure stability, and regulator response are verified. Test report available.

• 12‑Month Warranty – Full coverage against manufacturing defects.

• Competitive Workshop Pricing – Volume discounts for independent garages and Mercedes specialists.

• Fast Worldwide Shipping – Stock held in Europe, North America, and Asia.

• Expert Technical Support – Our diesel team provides fitment checks, diagnostic advice, and installation guidance via WhatsApp or email.

Contact Rsolid Engine Parts Today
📞 WhatsApp: +8615975376778
📧 Email: amy@rinjector.com