BMW E87 E90 E91 Diesel Engine M57 Vacuum Pipe Hose Line 7785449

BMW E87 E90 E91 Diesel Engine M57 Vacuum Pipe Hose Line is a vacuum system component designed for BMW M57 diesel engines. As part of the Pipes, hoses and lines group, it is responsible for the stable routing of vacuum in key control circuits of the power unit. Using an OEM component allows for a technically correct replacement of a worn-out hose without interfering with the factory design.

Specifications and technical data

• SKU: 7785449-4
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7798312
• Substitutable numbers: 7798312, 11667798312, 7789391, 11667789391, 7785449
• Fuel type: Diesel
• Category: Hoses, Lines & Pipes

Function of the vacuum hose in the M57 diesel engine

The vacuum hose in the M57 diesel engine is responsible for transporting vacuum from the vacuum pump to receivers, such as engine accessory control components. Stable pressure in this circuit is essential for the proper operation of control systems, smooth response to load, and maintaining the correct operating parameters of the power unit.

In Diesel engines, the vacuum system is of particular importance because many control functions rely on precisely metered vacuum. A functional hose minimizes the risk of leaks, power drops, and improper operation of actuators.

Construction and fitment for BMW E87, E90, E91

The offered hose has been designed as an OEM component for selected BMW 1 Series E87 and 3 Series E90 and E91 models with the M57 engine. This ensures the preservation of factory geometry, inner and outer diameters, and connection points, which facilitates installation in place of the original part without the need for modifications.

Thanks to a design consistent with factory specifications, the hose provides:

• correct vacuum routing in the engine bay,
• proper positioning relative to other components,
• reduction of the risk of chafing and mechanical damage resulting from improper routing.

Benefits of using an original vacuum hose

Using a vacuum hose dedicated to the M57 unit allows for maintaining system operating parameters consistent with the manufacturer's specifications. Compared to universal replacements, a matched OEM component limits the risk of leaks, installation problems, and improper fitment in the engine bay.

The main advantages include:

• compatibility with the factory vacuum system in BMW E87, E90, and E91 with a diesel engine,
• easier diagnostics of potential faults due to maintaining the original configuration,
• the ability to restore proper control system operation after replacing a worn or leaking hose.

Characteristics of the used product

The vacuum pipe hose line is offered as a used part, sourced from dismantling. Such components are frequently chosen for servicing older power units, where maintaining the original specification at a reasonable cost is important. A used element allows for a technically correct repair of the vacuum system, provided it is installed correctly and checked for leaks after installation.

BMW pipes, hoses and lines – expansion and system service

If you are planning a comprehensive repair or upgrade of the engine area in your BMW and need other elements from the same group, such as supply lines, vacuum hoses, or fluid routing pipes, check the available parts in the BMW pipes, hoses and lines category.

Technical support for selecting used components

When working with powertrain and vacuum systems, it is worth paying attention to the general condition of used components, their installation method, and compatibility with the specific engine version. It is also good practice to check other cooperating elements to avoid the recurrence of a fault shortly after.

If you want to expand your knowledge on the safe selection of used components in the powertrain and control system, the following guide may be helpful: Second-hand differential – what is worth knowing about used differentials, sensors, and drive systems.