Ford Focus MK2 Mondeo MK4 1.8 TDCi Crankcase Breather Vent Pipe 4M5Q-6A804-AC

The Ford Mondeo MK4 Crankcase Ventilation Hose is an original component of the crankcase ventilation system, designed for use in Ford engines. Thanks to its factory geometry and fit, it ensures stable oil vapor management and proper engine operation. It's a practical choice for users looking for a proven used part instead of unreliable aftermarket alternatives.

Specifications and technical data

• SKU: 4M5Q-6A804-AC
• Mark: Ford
• Condition: Used
• OEM Part Number: 4M5Q-6A804-AC
• Substitutable numbers: 4M5Q-6A804-AC, 4M5Q6A804AC
• Category: Air Pipes & Hoses

Function and Role of the Crankcase Ventilation Hose in the Ford Mondeo MK4

The crankcase ventilation hose in the Ford Mondeo MK4 is responsible for the controlled removal of gases from the crankcase into the intake system. A correctly selected component:

• stabilizes engine pressure and reduces the risk of oil leaks,
• minimizes carbon deposit buildup in the intake manifold,
• supports smooth engine operation at idle,
• helps maintain proper combustion parameters.

Using a hose of the appropriate diameter, shape, and flexibility is crucial for maintaining correct oil vapor circulation and protecting other engine components.

Why Choose an Original Ford Hose

The original Ford crankcase ventilation hose has been designed specifically for the engine bay geometry of the Mondeo MK4, which translates to:

• secure routing of the hose without stress or kinks,
• compatibility with factory spigots and connectors,
• appropriate material resistance to temperature and oil contact,
• reduced risk of leaks at critical points in the system.

This ensures a smooth installation, and the component does not require any additional modifications or adjustments after installation. This is particularly important for systems where leaks can cause power loss, fluctuating RPMs, or increased fuel consumption.

Part Condition and Service Application

The offered crankcase ventilation hose is a used part, sourced from disassembly, which allows for a reasonable cost while maintaining factory specifications. This type of component is ideal for:

• routine maintenance related to cracks or hardening of the old hose,
• restoring the sealing of the ventilation system after oil leaks or "false air" intake,
• preventive servicing during major work on engine components.

Choosing an original, used part is often more predictable than installing cheap aftermarket alternatives of uncertain material quality.

Crankcase Ventilation Hose Selection and Compatibility

To correctly select the crankcase ventilation hose for the Ford Mondeo MK4, it's advisable to pay attention to compatibility with the specific engine version and manufacturer's designations. The product has assigned catalog numbers and interchangeable numbers that facilitate verification of its fit for a particular car model. If in doubt, it's best to compare the shape and mounting method with the component currently installed in the vehicle or seek assistance from a mechanic.

If you are considering a broader engine upgrade or repair, comparative materials on engines and their operation may also be helpful – for example, a ranking of legendary BMW diesels and an analysis of used parts costs can provide a better understanding of the relationship between engine design and component durability.

Benefits of Choosing Used Parts

Using original, used engine system components, such as the crankcase ventilation hose, offers a sensible compromise between cost and quality. It allows you to:

• maintain the factory operating parameters of the engine,
• reduce expenses compared to new OE parts,
• ensure high repeatability of installation and fit,
• minimize the risk of problems typical of cheap aftermarket alternatives.

If you are interested in a broader context of the cost-effectiveness of using used components, it's worth reading the material on the braking system: how to safely reduce repair costs by choosing proven salvaged parts. Similar economic principles and part selection rules can also be applied to engine components, including crankcase ventilation hoses.