Q: What would cause an engine mount to shear off?

asked by on

Of all the things on my 2008 Mazda3 that could fail, the engine mount was one of my least expected. Seems like an easy thing to do right, just make something that holds the engine to the frame and doesn’t break off. Oh well, car was at 60,000 miles but it was never driven that hard. Repair wasn’t too expensive, I just worry more about the quality aspect. Now that I have repaired the motor mount, is there anything to look out for? Maybe vibration or noise? I want to make sure the new one doesn’t break as well.

Hello, motor mounts have a big job to perform. Think of a motor mount as the cushion insole of your shoes, and how the shoes feel after 3 months of continuous use. The motor mount is piece of rubber that is used to insulate engine vibration from the chassis. The mount has to deal with temperature, engine movement and weight. Mounts fail over time just from use. Mazda has issued a technical service bulletin (TSB 01-003/10) for motor mount number three collapsing causing a vibration in the chassis. If motor mount number three was replaced with the updated mount per the TSB then you should be ok for a while. Motor mounts in front wheel drive vehicles don’t last as long as mounts in most rear wheel drive vehicle. Motor mounts are part of maintenance and all of them will eventually will need to be replaced.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1,000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!
  1. Home
  2. Questions
  3. What would cause an engine mount to shear off?

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Driver’s seat is loose now, feels unsafe

Hello, a seat that comes loose can be dangerous. Mazda is aware of seat adjuster concerns and has issued a technical service bulletin (TSB 09-049/10) for rattle noise from the bottom of the driver’s seat. The cause of the rattle...

Q: Q: Intake manifold runner control

The code you had originally was likely the issue causing the problem. The intake manifold runner control is related to a vacuum motor that opens and closes butterfly valve inside the intake manifold. This is used to control the manifold...

Q: Rattling noise when shifting

Hello. I suspect that the motor mounts are the cause of this rattle. Motor mounts are designed to dampen engine movement and vibrational rattles. The dealer recommends inspecting the motor mounts at 60,000 miles and every 20,000 miles after that....

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.