Tag Archives: engine vibration

Anchor Industries: Transmission Mounting Trouble Signs

Don’t wait until it’s too late!

Practical tips for driveline mount failure signs and diagnosis

Key Causes
Transmission Mounting Trouble: Why mounts lose their resiliency and function efficiency- ultimately leading to failure

  • Acceleration
  • Hot and Cold Temperatures
  • Age and Ozone
  • Engine Torque
  • Braking
  • Collision Damage

Excessive Shifting or Misaligned Engine

An engine that appears out of alignment, relative to its normal position. This is caused by severely damaged mounts that will not keep an engine properly aligned and positioned to allow for adequate engine operation, and adequate operation of all of the supporting drive accessories. Probable Cause: Broken or severely damage mounts

Related Vehicle Problems (Check or replace mounts when doing these repairs):
Radiator repair: A punctured radiator from the fan blade could be caused by dramatic engine shift due to a broken mount.

Repairing exhaust leaks: Cracks or broken exhaust head pipe where it connects to the exhaust manifold.

Repairing damaged valve covers or other engine drive accessories like power steering pumps, water pumps or A/C compressors: In extreme cases broken motor mounts can allow a vehicle’s engine to shift and turn violently, especially during rapid engine acceleration, and/or high speed driving. This can cause physical damage if the engine turns far enough to one side to allow contact between the engine and the sides of the vehicle engine compartment. Engine parts can become cracked, broken or dented as the result of broken motor mounts.

Replacing Belts and Hoses: Severely damaged or broken mounts can cause engine belts and hoses to break and/or snap if the engine is allowed to shift back and forth excessively. Belts and hoses, especially water pump, power steering belts and radiator hoses, can be stretched abnormally and severely damaged or broken.

For more information on Transmission Mounting Trouble download the PDF here.

Visit anchor-online.com for details about transmission mounts.

Anchor Industries: Engine Vibration Causes

Engine Vibration May Not be Due to a Improperly Tuned Engine

It’s Most likely a Sign of Worn or Broken Driveline Mounts

When engine vibration is noticeable at idle, especially with 4 cylinder, odd-fire V6 and diesel engines, it is most likely a sign that the mounts are worn or completely broken. These vibrations tend to worsen when the A/C compressor is engaged.

Over time, the rubber portion of a mount will deteriorate and often separate from the support /mounting plates, or crack and deform. The result is excessive vibration.

Many late model vehicles use hydraulic liquid–filled mounts to minimize NVH (Noise, Vibration and Harshness). The liquid is contained in the hollow cavity inside the mount. As the part ages, leaks can occur causing the mount to deflate and lose its ability to dampen vibrations. It can also affect other related parts on the vehicle.

Note: Always replace hydraulic mounts with a new hydraulic mount when offered in order to maintain the original dampening characteristics that were designed for the vehicle.

On high mileage vehicles, replacing all the mounts at the same time will help eliminate annoying vibrations and reduce the risk of other mounts failing shortly after the original repair.

“Active” motor mounts incorporate hydraulics, along with a vacuum pump or electronic sensor to change the dampening characteristics. Active mounts are designed to be fairly elastic during idle and then stiffen up under higher engine RPM’s and loads to absorb engine vibration.

Late model applications that currently have integrated active mounts into their vehicles are Acura, Honda, Hyundai, Kia, Infiniti, Lexus, Nissan and Toyota.

For more information download the PDF here.