How to Tell If a Motor Mount Is Broke?

A broken will cause a number of problems for a vehicle. The motor mounts provide support and dampen the movements of the vehicle’s engine and transmission. Without a properly operating motor , the engine and transmission may move too quickly or too far which may cause damage to the engine, transmission, or other engine components. Motor mounts most often use a rubber block between two plates of metal with one attaching to the engine or transmission and the other to the vehicle’s body. Some motor mounts are hydraulic and use a small hydraulic piston in place of the rubber block.


1.Use the wheel chocks to block the wheels to prevent the vehicle from moving forward or backward. Open the hood of the vehicle and locate the motor mounts. Use light from the work light or flashlight to illuminate the lower portion of the motor and transmission to locate lower mounts. The amount and location of motor mounts will vary from one vehicle to another.
2.Visually inspect the motor mounts for damage. Motor mounts will use either a rubber block or a hydraulic piston to dampen engine and transmission movement. The rubber blocks may show wear, cracks or splits which will require mount replacement. Metal components in the mounts may corrode, bend, or otherwise become damaged. Faulty hydraulic mounts may also leak fluid.
3.Have the helper start the motor of the vehicle. Stand off to the side of the vehicle and observe the engine for movement. While watching the engine, have the helper hold the brake pedal while placing the vehicle in drive. Have the helper shift the vehicle slowly between drive and reverse and observe the engine. Movement of over ½ inch or a rapid movement with noise is a sign that a motor mount needs replaced. Have the helper place the vehicle back into park and turn off the engine.
4.Use the pry bar to exert pressure on each individual motor mount to feel for looseness. Motor mounts will give, but should only move a minimal amount of distance and should move under resistance and not freely.
5.Use the pry bar to feel for looseness between the motor mount plate and the mounting surface. Looseness between the mounting plate and engine, transmission, or vehicle body is an indication that the mounting bolts need tightening or are damaged.

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