Motorlager

Motorlager, in English engine mounts, are devices that secure the engine to the vehicle chassis while isolating vibration and noise generated by the engine. They anchor the engine to the subframe or chassis and help maintain the correct position of the engine and driveline during acceleration, braking, and gear changes.

Most passenger cars use elastomeric mounts combining metal brackets with a rubber-like polymer; some mounts use hydraulic elements with a fluid-filled chamber and a damper to improve vibration reduction. In performance or heavy-duty applications, solid or semi-solid mounts may be used, and some setups employ active mounts with sensors and actuators to counteract engine movement.

Typical construction involves a metal inner and outer housing with a bonded elastomer, while hydraulic mounts have chambers and dampers integrated. Installation positions include front and rear engine mounts and, in some layouts, additional torque mounts or transmission mounts that control drivetrain movement.

The primary purpose of motorlager is to limit engine movement and dampen vibrations, helping to preserve the alignment of the crankshaft, transmission, and driveshaft, and to reduce clutch judder and noise in the passenger cabin. They also contribute to overall ride quality by reducing the transmission of engine forces into the vehicle structure.

Failure signs include increased engine movement under load, clunking sounds during throttle application or gear shifts, excessive vibration at idle or acceleration, oil or coolant leaks near the mount, and visible cracking or separation of the elastomer. Replacement is typically done in pairs or sets if multiple mounts are worn, using OEM or quality aftermarket parts and following manufacturer torque specifications. Regular inspection for oil contamination and rubber degradation is advised.