2016-2019 BMW 7 Series 4.4 Engine Mount 686045701

Also known as

Motor Mount

Engine Support

Engine Insulator

Engine Block Mount

Active Engine Mount

What this part does

The engine mount secures the engine block to the vehicle subframe, ensuring the powertrain remains properly aligned under load. It utilizes internal fluid or rubber elements to absorb the intense vibrations and harmonics generated by the engine, effectively isolating the passenger cabin from mechanical harshness. On modern luxury platforms, these are often active mounts that dynamically adjust their stiffness via a vacuum or electrical connection based on engine RPM and driving modes. When an engine mount collapses or leaks, you will typically experience a noticeable increase in cabin vibration, clunking noises during hard acceleration or shifting, and excessive drivetrain movement.

Fits these vehicles

OEM and interchange numbers

686045701

Before you order

There are several critical checks required before purchasing an engine mount for this platform:

• Verify whether your original mount is a standard hydraulic unit or an active mount with a vacuum/electrical line. The replacement must match the factory connection type to prevent check engine lights and drivetrain malfunction warnings.
• Engine mounts on V8 engines should always be replaced in pairs. If one mount has failed, the remaining mount has absorbed double the rotational stress and is highly likely to fail shortly after.
• Ensure your vehicle's drivetrain layout matches the vehicle this came from. The subframe geometry and mount mounting brackets differ significantly between rear-wheel drive and all-wheel drive (xDrive) models.
• Inspect the cast aluminum mounting bracket on your vehicle for stress cracks before installation, as a collapsed mount often transfers damaging impact force directly to the bracket.