Engine Maintenance

How to Replace Motor Mounts


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You will need to replace motor mounts if your engine begins to shake. Correctly functioning engine motor mounts are extremely important for the smooth and optimal functioning of your vehicle's engine.

Tools Required:

  • Metric socket set
  • Heavy duty floor jack
  • Magnetic tray
  • Pry bar
  • Vehicle lift (optional in the place of a jack)
  • Over head pulley system (optional)

Step 1: Inspect

When your engine begins to shake violently as you pull away from a stop or accelerate during normal driving, the engine motor mounts require immediate attention. Their function is to prevent the engine from rattling and twisting itself to pieces. Normal wear and tear over the years causes the rubber holding the metal of the mounts together to lose its absorption qualities and to crack and break apart.

After feeling your engine shaking, check visually to make sure that you have diagnosed the problem correctly. Using both hands, push on the engine (once it has cooled down) to gauge unnatural movement in small, lightweight vehicles. Use a jack to raise larger vehicles so that you can inspect the engine mounts themselves for fracture and other damage.

Step 2: Locate the Mounts

Position the vehicle on a level area before you start the process. Then raise the hood and locate the mounts, which are secured with sizable bolts (depending on your engine, you may need to remove parts around the mounts to allow to you work).

Step 3: Jack the Vehicle Up

Remove the negative cable from the battery. Once this is done, jack the vehicle up and secure it on the stands.

Step 4: Remove the Mounts

Remove any engine parts in the immediate vicinity of the mounts that will prevent you from removing them. Observe the mounts carefully to gauge how best to remove the bolts. Not all of them will easily be removed from the top of the engine. Remove all bolts between the mount and the engine. Depending on the layout of your engine, you may require an extension and universal joint to achieve this. Working from under the vehicle, undo the bolts that secure the mount to the engine's framework.

Step 5: Jack the Engine Up

Be aware of the firewall clearance prior to jacking up the engine, so as not to break the radiator hoses or crimp AC lines. Jack the engine slowly up. Use an overhead pulley system to keep the engine in place as an added safety measure.

Step 6: Replace the Mount

Position the new mount. Coat the bolts lightly with a thread-locking compound and align the bolts in their original positions. Align the bolt holes in the engine and on the body frame and tighten bolts.

Step 7: Reverse the Steps

Lower the engine and replace any engine parts that you removed in order to gain access to the mounts. Lower the vehicle to the floor. Then, reconnect the negative cable to the battery.

Worn engine mounts can cause considerable damage in the engine as it twists with excessive movements. Your radiator can be damaged as the fan knocks into it and numerous hoses and pipes can be torn loose, causing additional damage. Replacing worn solid motor mounts in time will save the driver a great deal of money in the long run.

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