Description

This listing details a reconditioned Garrett GT18V turbocharger, specifically engineered for the Mercedes ML 270 CDI. This unit is a direct replacement for OE part numbers 727463-5004s and A6470900180, ensuring precise fitment and performance for your vehicle. As Birmingham’s turbocharger specialists since 1986, Gap Turbos meticulously reconditions these units to meet or exceed original equipment specifications.

The GT18V is a variable nozzle turbocharger, characterised by its ability to alter exhaust gas flow to the turbine, optimising boost pressure across the engine’s RPM range. This technology is crucial for the 165HP OM647 diesel engine, providing efficient power delivery and reduced turbo lag. Common failure modes for this particular turbocharger often involve the variable nozzle turbine (VNT) mechanism seizing due to carbon build-up from exhaust gases. This can lead to over-boosting or under-boosting, resulting in reduced engine performance, limp mode activation, or excessive smoke. Electronic actuator faults are also prevalent, preventing the VNT mechanism from operating correctly. Furthermore, like all turbochargers, the central housing rotating assembly (CHRA) can experience bearing wear due to oil contamination, lack of lubrication, or high mileage, leading to excessive shaft play, oil leaks, and a characteristic whistling or grinding noise.

What this turbocharger fits

This reconditioned GT18V turbocharger is suitable for the following application:

• Vehicle: Mercedes ML 270 CDI
• Engine Code: OM647
• Horsepower: 165 HP
• Year Range: 2002 – 2005
• Fuel Type: Diesel
• Original Equipment (OE) Part Number: 727463-5004s
• Alternative OE Part Number: A6470900180

At Gap Turbos, our reconditioning process for this GT18V involves a complete strip-down, thorough cleaning, inspection of all components, and replacement of all wear parts with new, high-quality equivalents. The VNT mechanism is meticulously cleaned and recalibrated, and the electronic actuator is tested and replaced if faulty. Each CHRA is balanced to exacting standards to ensure longevity and optimal performance. We offer this unit as a reconditioned exchange, or we can provide a new exchange unit if preferred. Our facility also provides a professional fitting service, including comprehensive system cleaning to address underlying issues that may have caused the original turbo failure. For a current price and our comprehensive warranty details, please contact Gap Turbos directly.

Specifications

Vehicle fitment

• Mercedes ML 270 CDI

Common faults & troubleshooting

• Loss of power or engine in limp mode: Often indicates the VNT mechanism is seized due to soot, preventing correct boost pressure regulation.
• Excessive black smoke from the exhaust: Can be a symptom of an under-boosting turbocharger or a boost leak, leading to incomplete combustion.
• Whistling or siren-like noise from the engine bay: Typically points to wear in the turbocharger’s CHRA bearings, indicating shaft play.
• Blue smoke from the exhaust or excessive oil consumption: Suggests oil is leaking past worn turbocharger seals into the exhaust or intake system.
• Engine Warning Light (EML) illuminated with boost-related fault codes: Electronic actuator failure or a sticking VNT mechanism are common culprits, requiring diagnostic checks.
• Hissing sound during acceleration: Likely a boost leak within the intake system, such as a split intercooler hose or a faulty manifold gasket.

Fitting notes for this unit

• Oil Feed Pipe Replacement: Always fit a brand new oil feed pipe to the turbocharger, as old pipes can contain carbon deposits that restrict oil flow and lead to premature failure.
• Oil Priming: Before the first start, crank the engine without allowing it to fire until oil pressure builds and oil flows from the turbo’s oil feed banjo bolt, ensuring initial lubrication.
• Gasket Replacement: Ensure all associated gaskets – manifold, downpipe, and oil/water lines – are replaced with new items to prevent exhaust or boost leaks.
• Sump and Oil Filter: Drain the engine oil and replace the oil filter and engine oil with the correct grade and specification to eliminate contaminants from the previous failure.
• Intercooler and Pipework Inspection: Thoroughly inspect and clean the intercooler and all intake pipework for any debris, oil residue, or blockages from the failed unit.
• Actuator Calibration: If the turbocharger includes an electronic actuator, ensure it is correctly calibrated to the vehicle’s ECU after installation, typically requiring diagnostic equipment.

Alternative part numbers

This turbo is also referenced by:

• A6470900180 — Mercedes Turbocharger OEM A6470900180 (Mercedes ML 270 CDI, OM647, 165hp)

Frequently asked questions