Mercedes Engine Mount Failure: Accurate Signs and Causes

While the exterior and interior of your Mercedes can be described as nothing but luxurious, some of the least glamorous parts of your vehicle’s inner workings complete the most essential tasks. This allows you to hit the road feeling completely carefree.

Every time you start, accelerate, or stop your Mercedes, you are create a massive amount of movement and torque. The only parts standing between that shaking engine and your smooth, comfortable ride are the engine mounts. Those are the unsung heroes of your drivetrain system.

When these specialized parts begin to fail―especially the advanced hydraulic mounts that are common in Mercedes, the results are not just uncomfortable, but can lead to major damage to belts, hoses, and even the transmission. Gradually, a simple ignored vibration can turn into a complex and costly repair in no time.

Top Signs Your Mercedes’s Engine Mounts Needs Replacement

Excessive Noise: A common symptom of failed or deteriorated engine mountings is noise coming from the engine bay such as knocking or clunking. Not every noise is directly related to your engine mount, but worn engine mounts can mean the engine is moving around more than normal and making contact with other components. This can particularly be the case during starting and stopping of the engine.

Excessive Vibration: One of the first telltale signs that it’s time to replace engine mounts is if you are experiencing increased vibration. When an engine mount is damaged, its anti-vibration properties may reduce. There may be a loss of stiffness of the rubber, bonding failures, or even leaking fluid-filled mounts. In these instances, the vibration dampening effect of your engine mounting may not be working properly and can transmit the vibration and noise from the engine through to the driver.

Start Up and Shut Down Movement: When your engine mounts have failed, you may notice your vehicle lurching forward when you start the engine. The lurch then usually turns into a constant vibration, but you may then also feel a lurch when the ignition is turned off. This is due to the engine torque and loss of engine mounting stiffness or constraint, resulting in the engine moving within the engine compartment.

A Rough Ride: If you experience a jolt when changing gears, you may find your engine mount needs replacing. When travelling at a quicker speed, these jolts or thuds can be more noticeable. This will cause movement of the engine and can lead to damage of your engine block and other components. If not resolved, driving your vehicle can become a risk.

Top Causes of Worn-Out Engine Mounts in Your Mercedes

Ageing Over Time: Much like every integral piece to an engine, with time and heavy usage, engine mounts will begin to deteriorate with time. It is important to keep an eye on your machinery and make sure it is all good and is in working condition.

Poorly Installed Engine Mounts: Even though it’s possible to fit your own engine mountings, poorly installed engine mountings may fail, or at best, not last as long as they should. We’ve all heard the saying ‘pay cheap, pay twice’ so make sure you visit a reputable, qualified mechanical engineering technician that has suitable equipment to perform the job.

Poor Driving Habits that Damage Your Vehicle Parts: Incorrect or poor control of the vehicle can cause excessive strain and the engine mountings and potentially costly long-term damage to your vehicle. For example, excessive speed over rough ground can cause excessive shock forces which will be transmitted through the engine mountings. Following correct operator procedures and driving techniques will extend the lifespan of your engine mounts and along with vehicle components.

Fluid Leaks onto the Engine Mounts: Leaks in any motor vehicle should be dealt with immediately. Engine oil that has leaked onto engine mounts could cause rubber to soften and fail. Most often, engine mountings are manufactured in Natural rubber, however certain applications will require synthetic materials to protect from the outside environment such as fluids and heat. Fuel and Oil will attack natural rubber and break down the mechanical properties such as the mounting stiffness.

Final Words

Have you ever imagined what happens if I don’t replace engine mounts when they are faulty? All engine mounts will wear and fail over time and not replacing engine mountings could lead to the following:

l Excessive Vibration

l Damage or Wear to the engine

l Damage or Wear to other components in the engine

Engine mounts should regularly be checked during your vehicle’s service schedule. As a rule of thumb, if one fails, it is sensible to replace them all. A failed engine mount will put additional strain on the remaining intact engine mounts.

M Service, INC. is one of the most popular auto repair shops in the Walnut Creek area that is having years of experience in looking after European cars Land Rover, Audi, BMW, Mini, Mercedes, and Porsche. At M Service, INC.