Description

This listing is for a reconditioned Garrett GT18V turbocharger, specifically engineered for the Mercedes E-Class 220 CDI (OM646 engine, 150HP) manufactured between 2002 and 2008. It directly replaces OEM part number A6460900080 and alternative 727461-5006s, offering a reliable and cost-effective solution for turbocharger replacement.

The Garrett GT18V is a variable nozzle turbine (VNT) turbocharger, meaning it uses adjustable vanes to optimise exhaust gas flow across the turbine wheel. This design allows for improved throttle response, reduced turbo lag, and enhanced fuel efficiency across the engine’s RPM range. However, the intricate VNT mechanism is also a common point of failure. Over time, soot and carbon deposits from the exhaust gases can accumulate on the vanes, causing them to seize. This leads to issues such as over-boosting, under-boosting, or erratic boost control, often triggering engine management lights and limp mode. Another frequent failure mode for this unit involves the electronic actuator, which controls the VNT mechanism. Actuator faults can manifest as incorrect boost pressure, as the engine’s ECU loses precise control over the turbo’s output. Furthermore, like all turbochargers, the central rotating assembly (CHRA) bearings can suffer wear due to oil starvation, contamination, or high operating temperatures, leading to excessive shaft play, oil leaks, and ultimately, turbocharger failure.

At Gap Turbos, our reconditioned units undergo a rigorous process to address these common issues. Each turbocharger is fully dismantled, cleaned, and inspected. Worn components, including bearings, seals, and thrust collars, are replaced with brand new, high-quality parts. The CHRA is precision balanced to OE specifications, and the VNT mechanism is thoroughly cleaned, repaired, and calibrated to ensure optimal performance. The electronic actuator is also tested and recalibrated or replaced as necessary.

What this turbocharger fits

This specific reconditioned turbocharger is suitable for:

• Vehicle: Mercedes E-Class 220 CDI
• Engine Code: OM646
• Horsepower: 150 HP
• Year Range: 2002 – 2008
• Fuel Type: Diesel
• OEM Part Number: A6460900080
• Alternative Part Numbers: 727461-5006s

We pride ourselves on providing robust, reconditioned turbochargers that meet or exceed original equipment standards. In addition to reconditioned units, we can also supply brand-new exchange turbochargers if preferred. Our Birmingham workshop offers a professional fitting service, and we can also provide DPF and catalytic converter cleaning services, which are often crucial to prevent premature failure of a new or reconditioned turbocharger.

For a precise quote and to discuss our comprehensive warranty options, please contact us directly. We are committed to providing reliable solutions and expert advice.

Specifications

Vehicle fitment

• Mercedes E-Class 220 CDI

Common faults & troubleshooting

• Loss of power or ‘limp mode’: Often caused by the VNT mechanism seizing due to soot, leading to incorrect boost pressure; inspect and clean VNT or replace turbo.
• Whining or grinding noise from the engine bay: Indicates excessive shaft play in the turbocharger’s CHRA bearings, requiring turbo replacement.
• Excessive smoke from the exhaust (blue/white): Could be oil leaking past worn turbo seals into the exhaust or intake; inspect turbo for oil ingress.
• Engine management light (EML) illuminated with boost pressure fault codes: Points to an issue with the electronic actuator or VNT mechanism; check actuator function and VNT movement.
• Oil leaks around the turbocharger connections: Check oil feed and return lines for blockages or loose connections, as well as turbo seals for failure.

Fitting notes for this unit

• Always replace the oil feed pipe and all associated gaskets and seals when fitting a new or reconditioned turbocharger.
• Thoroughly clean or replace the intercooler and all intake pipework to remove any debris or oil residue from the previous turbo failure.
• Ensure the engine’s oil system is flushed and fresh, correct-specification engine oil and a new oil filter are used before starting.
• Prime the new turbocharger with clean engine oil through the oil feed port before connecting the oil feed pipe to ensure initial lubrication on first start-up.
• After installation, crank the engine without allowing it to start for 10-15 seconds to build oil pressure and circulate oil through the turbo.
• Check for any boost leaks or exhaust leaks immediately after installation and during the first test drive, paying attention to all clamps and connections.

Alternative part numbers

This turbo is also referenced by:

• 727461-5006s — GT18V Turbocharger OE 727461-5006s (Mercedes E-Class 220 CDI, OM646, 150hp)

Frequently asked questions