Mercedes W204 Petrol M274 Crankcase Ventilation Line Hose Valve A2740181300

Mercedes W204 Petrol M274 Crankcase Ventilation Line Hose Valve is a component from the Lines, Hoses and Pipes group, designed for petrol engines of this series. It ensures controlled discharge of gases from the crankcase, which promotes stable engine operation and reduces the risk of unwanted leaks or a decrease in engine performance.

Specifications and technical data

• SKU: A2740181300-1
• 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

Function of the crankcase ventilation line

The crankcase ventilation line in M274 series petrol engines is responsible for the safe discharge of gases generated during engine operation. A properly functioning ventilation system:

• stabilizes pressure in the crankcase,
• limits oil blow-by into the intake system,
• supports smooth engine operation under various loads,
• reduces the risk of leaks at shaft seals and covers.

Thanks to a properly selected line, the breather system maintains tightness and proper flow, which translates into predictable engine performance parameters.

Purpose and compatibility

The offered line is dedicated to M274 series petrol engines used in Mercedes W204 class models. Using a component from the same design group allows for maintaining the factory routing geometry and compatibility with original connectors and mounts in the engine bay.

Such a fit reduces the risk of tension, twisting, or incorrect positioning of the line, which is particularly important in an area exposed to temperature changes and engine vibrations.

Performance characteristics and advantages

The crankcase ventilation line from this offer comes from disassembly, which allows for an economical replacement of the component while maintaining the original specification. A used component of this class is a reasonable choice in situations where:

• the existing line shows signs of cracks, brittleness, or leaks,
• there are problems with unstable idle speed related to the breather system,
• it is necessary to replace several components of the ventilation system during a single service intervention.

Using an original line from the same design family helps maintain the consistency of the entire ventilation system, which is important both for engine durability and for maintaining proper exhaust emission parameters.

Professional use in service and repairs

Replacing the crankcase ventilation line is recommended during any major intervention in the engine accessory area, especially when intake components or engine covers are removed. Mechanics often combine this operation with an inspection of other vacuum and breather lines to avoid the problem returning shortly after.

If you are planning a comprehensive repair or upgrade of the engine area in your Mercedes and need other components from the same group, such as vacuum lines, flexible hoses, or rigid pipes carrying operating media, check the available parts in the Mercedes Lines, Hoses and Pipes category.

Additional technical support

When diagnosing improper engine operation, it is also worth paying attention to the condition of the suspension, which affects vibration transmission and overall driving comfort. In case of problems with noise from the chassis area, a guide material may be helpful – you can find more information in the article Knocking in the suspension? Discover a clever way to restore factory handling precision without spending a fortune at the service center.