Mercedes W204 M274 Crankcase Throttle Ventilation Pipe Bleed Hose A2740181300

Mercedes W204 M274 Crankcase Throttle Ventilation Pipe Bleed Hose is an original crankcase ventilation system component designed for gasoline engines, ensuring stable discharge of vapors from the crankcase. Thanks to its precise fit for the M274 unit in the W204 model, the hose supports proper engine operation and reduces the risk of unwanted leaks. It is a practical solution for users looking for a proven part with factory geometry and solid construction.

Specifications and technical data

• SKU: A2740181300
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2740181300
• Substitutable numbers: A2740181300, A 274 018 13 00
• Fuel type: Petrol
• Category: Hoses, Lines & Pipes

Purpose and function of the ventilation hose

The crankcase ventilation hose in the M274 engine is responsible for the controlled discharge of gases from inside the engine to the intake system. A properly functioning component of this type:

• stabilizes pressure in the crankcase,
• reduces blow-by and uncontrolled oil leaks,
• supports the proper operation of the ventilation and vapor recirculation system,
• indirectly influences the engine's operating culture.

In the case of gasoline engines, it is particularly important to maintain the tightness and patency of the ventilation system, which is why using a dedicated hose with the correct shape and diameter is crucial for maintaining stable operating parameters.

Compatibility with the M274 unit and W204 body

The presented hose was designed for use in the ventilation system of the M274 engine mounted in the W204 body. This means a properly selected length, bending profile, and connection points, which facilitates installation in factory brackets and guides. As a result, the component maintains the correct position relative to the engine block and accessories, minimizing stress and the risk of abrasion.

Gasoline engines require a stable ventilation system, and a properly selected ventilation hose helps maintain the balance between the efficiency and durability of the power unit. Using a part consistent with the M274 design reduces the need for modifications and speeds up service work.

Technical and material characteristics

The hose belongs to the group of elements referred to as Lines, hoses, and pipes, which means it has been designed to work in an oil-air environment and at elevated temperatures. The typical construction of such components includes:

• profiled geometry adapted to the engine compartment space,
• material resistant to oil and fuel vapors,
• reinforced ends that work with clamps or quick-connectors,
• an inner surface adapted to the flow of a mixture of gases and oil mist.

This type of solution allows for long-term operation without excessive deformation and cracking, provided it is installed correctly and the condition of the hose is periodically checked during service inspections.

Part condition and installation aspects

The offered item is a used part, which in practice means an attractive compromise between cost and functionality. For workshops and individual users, this provides an opportunity for an economical repair of the ventilation system while maintaining the original design of the hose. Before installation, standard verification of tightness, flexibility, and connection sockets is recommended.

During replacement, it is worth paying attention to:

• the correct positioning of the hose relative to other accessory components,
• the condition of clamps or quick-connectors,
• the cleanliness of the ports in the engine block and intake system,
• avoiding contact of the hose with sharp edges or high-temperature elements.

Such an approach reduces the risk of recurring leaks and ensures stable operation of the ventilation system in the long term.

Technical support and related content

If you are planning a wider range of work on engine systems or are looking for other elements from the lines and hoses group, it is worth browsing the full offer in the Lines, hoses, and pipes category to select compatible components for your vehicle. This will allow you to complete the set of parts necessary for comprehensive maintenance of the power unit.

For those analyzing the broader context of drivetrain repairs, including the selection of elements working with the gearbox, the guide how to consciously choose and evaluate a used gearbox – manual, automatic, and DSG, which discusses common faults and practical service tips, may be helpful. Additionally, we encourage you to read other technical materials in the blog section, including the article on diagnostics and operation of key drivetrain components, which will facilitate the planning of further service work on your Mercedes.