Description
This listing is for a reconditioned Garrett GT20V turbocharger, specifically designed for the Mercedes E320 CDI V6 (OM642 engine) produced between 2005 and 2011. It addresses common issues associated with the original unit, offering a reliable and cost-effective replacement for your diesel vehicle.
The Garrett GT20V is a variable nozzle turbine (VNT) turbocharger, meaning it utilises adjustable vanes within the turbine housing to precisely control exhaust gas flow onto the turbine wheel. This technology is crucial for the 224HP OM642 engine, ensuring optimal boost pressure across the entire engine RPM range, leading to efficient power delivery, reduced turbo lag, and improved fuel economy. Common failure modes for this particular turbocharger often involve the variable vane mechanism seizing due to carbon and soot build-up from exhaust gases. This can lead to erratic boost control, reduced engine performance, activation of the engine management light, and sometimes a ‘limp mode’ condition. Electronic actuator faults are also prevalent, preventing the vanes from adjusting correctly, which can manifest as over-boosting or under-boosting. Furthermore, like all turbochargers, the central housing rotating assembly (CHRA) bearings can wear over time due to insufficient lubrication or contamination, indicated by excessive shaft play, oil leaks into the exhaust or intake, or a distinct whining noise under acceleration.
What this turbocharger fits
This reconditioned GT20V turbocharger is a direct fit for Mercedes E320 CDI V6 models equipped with the OM642 engine code, manufactured between 2005 and 2011. The primary OEM part number is A6420901480, with common alternative part numbers including 765155-5007s. It is vital to cross-reference your existing turbocharger’s part number, usually found on a small metal tag on the compressor housing, to ensure correct fitment before ordering.
At Gap Turbos, we provide a comprehensive service for this unit. Our reconditioned turbochargers undergo a meticulous, multi-stage process where they are fully stripped, ultrasonically cleaned, inspected for wear and damage, and then rebuilt with new, high-quality OEM-equivalent components. This includes replacement of all bearings, seals, and often the variable vane mechanism or electronic actuator if found to be faulty. Each reconditioned unit is then balanced on a VSR (Vibration Sorting Rig) machine to exacting OEM specifications, ensuring longevity and optimal performance. We also offer new exchange units for immediate dispatch, a professional fitting service at our Birmingham workshop, and a thorough DPF and intercooler cleaning service to address potential root causes of turbo failure, which is critical for preventing premature failure of the replacement unit.
For a precise quote on a reconditioned unit, new exchange, or our fitting services, please contact us directly. All our reconditioned and new exchange turbochargers come with a standard warranty for your peace of mind.
Specifications
| Frame | GT20V |
|---|---|
| Engine code(s) | OM642 |
| Horsepower | 224hp |
| Year range | 2005-2011 |
| Fuel | Diesel |
| OEM number | A6420901480 |
| Alternative number(s) | 765155-5007s |
| Condition | Reconditioned |
Vehicle fitment
- Mercedes E320 CDI V6
Common faults & troubleshooting
[“Reduced engine power or ‘limp mode’: Often caused by a seized variable vane mechanism or faulty electronic actuator, preventing correct boost pressure.”, ‘Excessive blue/grey smoke from exhaust: Indicates oil bypassing worn turbocharger bearings and seals, burning in the exhaust system.’, ‘Loud whining or screeching noise from engine bay: A common sign of failing turbocharger bearings or contact between the compressor/turbine wheel and housing.’, ‘Engine management light (EML) illuminated with boost-related fault codes: Typically points to issues with the VNT system, actuator, or boost sensor readings.’, “Oil leaks around the turbocharger connections: Could be due to failed seals within the turbo’s CHRA or issues with the oil feed/drain lines.”]
Fitting notes for this unit
[‘Always replace the oil feed pipe and drain pipe gaskets to prevent leaks and ensure proper oil flow. Consider replacing the entire oil feed pipe if it shows signs of carbon build-up.’, ‘Thoroughly clean all associated pipework, intercooler, and intake manifold to remove any debris or oil contamination from the previous failure.’, “Ensure the engine’s oil system is flushed and a new oil filter and fresh, correct-specification engine oil are used before starting.”, ‘Prime the new turbocharger by pre-filling the oil feed gallery with clean engine oil before connecting the feed pipe, and crank the engine without starting to build oil pressure.’, ‘Check for any exhaust system blockages, particularly the DPF, as back pressure can severely impact turbocharger longevity. A blocked DPF should be professionally cleaned or replaced.’, ‘Torque all fasteners to manufacturer specifications, paying particular attention to the exhaust manifold and oil line connections to prevent leaks.’]
Alternative part numbers
This turbo is also referenced by:
765155-5007s— GT20V Turbocharger OE 765155-5007s (Mercedes E320 CDI V6, OM642, 224hp)
Need this turbo cleaned or reconditioned?
Many turbo faults are actuator-only or VNT vane carbon buildup, not a failed core. We strip, ultrasonically clean, rebuild, and balance to OEM tolerances with a 24-month parts and labour warranty.
Turbo Reconditioning →Need to speak to a turbocharger expert?
Send your reg, a photo of the existing part, and a brief description of the fault. We will respond same day.
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