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How To Replace Motor (Engine) Mounts

Motor mounts connect the engine to the vehicle frame (a.k.a. chassis). Their job does not stop there, in fact, they also keep the vehicle quiet and smooth while the engine is running.

Motor mounts do wear out and require replacement to prevent further damage to the vehicle. It is not extremely difficult on most vehicles, as long as proper tools are used in a patient manner. 

Most modern motor mounts use a liquid filled core, which is contained inside of a composite rubber insert. This allows the mount to flex as needed while still preventing the vehicle from absorbing the vibrations and noise from the engine. This composite rubber insert, also called the insulator, is encased in a metallic housing to provide a firm, stable mounting surface for the engine and transmission, and the portion that connects to the engine is inserted into the insulator and secured via bolts. This design suspends the engine by composite rubber instead of metal.

How To Replace Motor (Engine) Mounts

  1. Disconnect the negative battery cable, and move it away from the battery
  2. Determine the position of the motor mount to be changed, and lift the vehicle if necessary
  3. Never use a jack to lift an engine from underneath. This could damage the oil pan, and prevents the vehicle from being lifted or moved during the repair. Instead, use a transverse engine brace to support the engine
  4. Remove any components that obstruct the removal of the motor mount or motor mount fasteners
  5. Loosen and remove the motor mount fasteners, lifting the vehicle if necessary
  6. Ensure the engine brace maintains the position of the engine, and remove the motor mount from the vehicle
  7. Clean the mount area and properly, and install the new motor mount. Ensure that the fasteners are straight, clean, and tightened to specification using a torque wrench. 
  8. Remove the transverse engine brace, and safely lower the vehicle  (if raised)
  9. Replace any components that were removed for access to the motor mount
  10. Reconnect the battery, ensure the hood latches properly, and test drive the vehicle to verify the repair

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