What they do:
Engine mounts support the engine and transmission. Most are of simple design, with metal attachment plates and large rubber insulator blocks that dampen noise and vibration from being transmitted to the rest of the vehicle.
Signs of problems:
While engine mounts are seldom checked, thumping or rattling noises coming from the engine compartment warrant immediate inspection. As the engine twists and rocks as the vehicle accelerates, components such as radiator and heater hoses and wiring connectors can become overstressed. If a transverse-mounted engine is subjected to excessive rocking back and forth, it can lead to exhaust leaks where the head pipe joins the manifold. These and other potential consequences should lead vehicle owners to correct the problem as soon as possible.
TIP: One way for vehicle owners to check the condition of their engine mounts is to put their automobiles into drive and lightly press on the accelerator while bearing down on the brake pedal. Excessive engine movement indicates loose or broken mounts.
If you hear noises coming from your vehicle, or any other sign of poor engine performance, it is important to have it looked at right away.
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