BMW 1 3 5 Series E60 E87 E90 E91 M47N2 Cover Mass Compensator Engine 7787504

The BMW 1, 3, and 5 Series (E60, E87, E90, E91, M47N2) Engine Mass Balancer Cover is an original part designed for the front left side of the engine unit. This used OEM part ensures proper mounting and stable cooperation with the vibration compensation system, leading to smoother, more predictable engine operation and reduced unwanted vibrations.

Specifications and technical data

• SKU: 7787504
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7787504
• Substitutable numbers: 11277787504, 7787504, EM
• Location on the vehicle: Front, Left
• Category: Other Engine Parts

Purpose and Function in the Drivetrain

The M47N2 Engine Mass Balancer Cover operates in the front area of the engine unit, on the left side, where it is responsible for the stable seating of the torsional vibration damping element. In practice, this means:

• maintaining the correct geometry of cooperating engine components,
• limiting the transfer of vibrations to the block and accessories,
• increasing the refinement of the diesel engine, especially at low and medium RPMs.

By preserving the factory mounting points and shape, this part allows for compliance with the original BMW design, which is important for both repairs and restoring the car to a near-factory condition.

Compatibility with BMW Models

The component is designed to work with the M47N2 engine used in popular models of the BMW 1, 3, and 5 Series, E60, E87, E90, E91 generations. It is always advisable to verify the correct fitment for a specific body version and engine unit based on the OEM part number and interchangeable numbers visible in the technical specifications.

This approach minimizes the risk of installation problems and ensures that the cover will work with the existing mass balancer and other engine accessory components.

Vehicle Placement and Installation Aspects

The cover is intended for installation in the front left part of the drivetrain assembly. Its clearly defined location facilitates the mechanic's work and speeds up the replacement process. In practice, installation involves:

• removing covers and auxiliary components from the front of the engine,
• unscrewing the worn or damaged balancer cover,
• inspecting the mating surfaces and the condition of cooperating components,
• installing the used OEM part, observing the correct sequence and tightening torques (according to BMW service documentation).

The original geometry and mounting points facilitate precise fitting with the engine block and the mass balancer, which is crucial for maintaining the correct operation of the vibration damping system.

Characteristics of a Used OEM Part

As a used original BMW part, the mass balancer cover offers a sensible compromise between cost and maintaining factory parameters. Compared to aftermarket alternatives, an OEM part offers:

• material and structural compliance with the manufacturer's design,
• guaranteed fitment for the M47N2 engine without modifications,
• consistency with other BMW drivetrain components.

Before installation, a standard visual inspection of the working surfaces and threads is recommended to confirm the part's readiness for further use in the specific vehicle.

If you are planning a comprehensive repair or upgrade of the engine area in your BMW and need other parts from the same group, such as covers, mounts, or additional brackets, check the available parts in the Other BMW category.

Technical Support and Drivetrain Development

For users interested in comparing the characteristics of engine units and solutions used in different brands, including sports variants, an article describing the differences in engine, brake, and chassis construction may be helpful. In this context, it is worth reading the material: Audi RS vs. Other Models – What Lies Under the Hood and Chassis?, which provides a better understanding of how manufacturers design drivetrains for performance and durability.

If you are considering further engine modifications or want to approach tuning consciously using proven, used components, a practical guide on safely increasing engine power will be helpful. Detailed tips can be found in the article How to Increase Engine Power: A Practical Engine Tuning Guide with Used Parts, which discusses key aspects of engine modernization step by step.