Why you should never drive with damaged engine mounts

The engine mount, also known as the engine silentbloc or engine buffer, is a mechanical part often overlooked by motorists, but which plays a fundamental role in the smooth running of a vehicle. It connects the engine to the vehicle chassis, absorbing engine vibrations while holding the engine in position, even under hard acceleration or braking. When one or more motor mounts are damaged, several negative consequences can occur. In this article, we’ll explain why it’s highly inadvisable to continue driving with defective engine mounts.

1. Motor support function

Before understanding the risks, it’s essential to understand the role played by the engine mount. A motor is a heavy, powerful part that generates strong vibrations and movements during operation. Engine mounts, generally made of rubber and metal, are used to :

• Secure the motor to the vehicle frame;

• Absorb engine vibration and noise;

• Allow the motor to move slightly to dampen jerks;

• Reduce the transmission of vibrations to the rest of the vehicle, especially the passenger compartment.

Without these parts, the motor could move uncontrollably, creating noise, shock or even serious mechanical failure.

2. Signs of a damaged engine mount

It’s not always easy for a driver to spot an engine support problem. But there are some warning signs:

• Abnormally strong vibrations in the cabin, especially at idle;

• Muffled noises or “clicks” during gear changes or acceleration;

• An engine that seems to “move” or shake excessively;

• Premature wear of other engine or transmission parts.

As soon as these symptoms appear, an inspection by a professional is highly recommended.

3. Mechanical risks of driving with a broken engine mount

Continuing to drive with one or more damaged engine mounts exposes the vehicle to a number of mechanical risks:

a. Motor displacement

A defective bracket no longer holds the motor correctly in place. This can lead to abnormal movement of the engine, which can then strike other components in the engine compartment: hoses, cables, radiator, exhaust system, etc. This type of contact can cause leaks (coolant, oil), short-circuits or broken cables.

b. Gearbox damage

The gearbox is integral with the engine. If this is no longer held correctly, the mechanical stress on the gearbox increases considerably. This can lead to premature wear of internal components, or even outright breakage of the gearbox.

c. Abnormal wear of drive shafts and exhaust system

When the engine moves abnormally, the drive shafts (cardan shafts) must compensate for this movement. This places additional stress on these parts, which are not designed to withstand such treatment. The same applies to the exhaust system, which can crack or come loose.

4. Safety implications

In addition to mechanical damage, damaged engine mounts also present a safety risk for drivers and passengers.

a. Loss of control

In extreme cases, a suddenly moving motor can throw the vehicle off balance, especially during sudden maneuvers. This can lead to loss of control, especially at high speeds.

b. Reduced stability

Vibrations not absorbed by the engine mounts can affect the vehicle’s handling. The result is less precise steering, a feeling of floating and a loss of stability when cornering.

c. Breakdowns on the road

A poorly maintained engine can cause a sudden breakdown: an electrical cable breaks, the fuel supply is cut off, or the engine suddenly stops. A breakdown on the road, especially on a freeway or in a tunnel, represents a real danger.

5. Economic impact

Ignoring an engine support problem can also have a significant economic cost. Indeed, repairs to damage caused by a broken bracket are often far more expensive than simply replacing it.

a. Cascade repairs

A stand costs between 50 and 150 euros, including labor. On the other hand, repairing an engine that has hit a radiator or gearbox can easily cost several thousand euros.

b. Premature vehicle wear

An engine that vibrates excessively wears out other components prematurely: gearbox silentblocks, transmission mounts, cables, hoses, etc. The vehicle ages faster, and its resale value declines.

6. Impact on driving comfort

Driving with worn or broken engine mounts literally transforms the driving experience. The engine becomes noisy, the car vibrates constantly, accelerations become less fluid and gear changes jerky. This leads to increased driver fatigue and reduced overall driving quality.

7. Environmental impact

A poorly secured motor may operate less optimally. This can lead to incomplete fuel combustion, increasing fuel consumption and pollutant emissions. A single damaged bracket can therefore worsen the vehicle’s ecological footprint.

Conclusion

In conclusion, driving with damaged engine mounts is a mistake that can be costly, both mechanically and in terms of safety. These parts play an essential role in the stability of the engine and the vehicle in general. Ignoring signs of wear and tear can lead to serious breakdowns, rapid deterioration of other components, an unpleasant ride, and above all, endanger the lives of the vehicle’s occupants.

We therefore strongly recommend regular inspection of engine mounts, especially during periodic overhauls. If in doubt, it’s best to consult a professional and proceed with the replacement without delay. It’s a small investment for a big gain in safety, comfort and vehicle longevity.