Audi TT 8N VW Golf Mk4 Turbocharger Turbo Upper Cover Plate 1.8T 06A145704B

Audi TT 8N VW Golf Mk4 Turbocharger Turbo Upper Cover Plate 1.8T is an original component from the Turbochargers and parts group, designed for the forced induction system in vehicles with diesel engines. This used OEM part ensures a factory fit, maintaining the correct exhaust and air flow geometry within the turbocharger, which promotes stable engine operation.

Specifications and technical data

• SKU: 06A145704B-1
• Mark: Audi
• Condition: Used
• OEM Part Number: 06A145704B
• Substitutable numbers: 06A145704B, 06A 145 704 B
• Fuel type: Diesel
• Category: Turbos & Parts

Purpose and function in the forced induction system

The turbocharger upper cover plate is responsible for a tight and stable seal of the turbine housing, which is crucial for maintaining proper boost pressure and the correct direction of gas flow. In diesel-powered units, this component works with other turbocharger parts, reducing energy losses and supporting efficient torque utilization across the entire rev range.

Thanks to a design compliant with Audi manufacturer standards, the cover maintains the required assembly tolerances, which facilitates proper seating on the turbine housing and compatibility with adjacent exhaust and intake system components.

Benefits of using an original turbocharger cover plate

Using an original turbocharger upper cover plate in an Audi TT 8N or VW Golf Mk4 helps maintain the structural integrity of the entire forced induction system. In practice, this translates into:

• maintaining the factory operating characteristics of the turbocharger,
• reducing the risk of leaks in connection areas,
• easier installation due to compatibility with original mounting points,
• maintaining predictable performance parameters of the diesel engine.

This used OEM part represents a reasonable compromise between cost and quality, especially for maintenance repairs or the restoration of older models, where maintaining compliance with factory specifications is key without the need to invest in a new component.

Condition of the item and assembly aspects

The cover is offered in a used condition, meaning it has been removed from a vehicle but retains the functionality required for further operation. Before installation, it is recommended to perform a standard inspection of the mating surfaces, threads, and mounting points, as well as to use new seals in accordance with the vehicle manufacturer's recommendations.

Since this is a component from the Turbochargers and parts group, installation is performed within the existing forced induction system without the need for structural modifications, which reduces service time and helps maintain the consistency of the entire system.

Part selection and vehicle compatibility

When selecting a turbocharger upper cover plate for an Audi TT 8N or VW Golf Mk4 with a diesel engine, it is crucial to compare the parameters with the currently installed part and verify compatibility with the vehicle's technical documentation. Original manufacturer markings and available interchangeable numbers allow for precise confirmation of compatibility, which minimizes the risk of assembly issues.

A properly selected part supports stable turbocharger operation, which is important for both performance and the durability of the engine in daily use.

Expanding the forced induction system in Audi

If you are planning a comprehensive repair or upgrade of the engine area in your Audi and need other elements from the same group, such as turbocharger housings, boost hoses, or additional mounting hardware, check out the available parts in the Audi Turbochargers and parts category.

More about used parts for German cars

When choosing used components for a forced induction system, it is worth knowing the differences between parts that can be safely purchased second-hand and those that are better bought new. A detailed discussion of this topic can be found in the article: Restoration and repair of German cars: which used parts are worth buying and which should you avoid?.