Engine mounts reduce engine vibration during operation and hold the integral component in place. When these parts become worn or broken the effects can cascade through a vehicle, affecting everything from engine operation to emissions and even heating and cooling systems. Automotive repair website Pioneer Auto Inc recommends checking engine mounts after every major engine repair job.
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Engine Rocking or Twisting
A damaged or failed engine mount can cause excessive rocking or twisting in the engine block, according to automotive repair website AA1 Car. A driver may notice increased vibration from the engine, especially when idling or accelerating. In severe cases where the mount and its support systems have broken the entire engine could fall out of the bottom of the vehicle. Engine rocking and twisting in front-wheel drive vehicles can be especially problematic because the engine can contact the throttle or shift linkage, inhibiting operation and damaging components.
Problems with damaged engine mounts in rear-wheel drive vehicles with engine-driven radiator fans can cause the fan to contact the sides of the radiator mount, causing damage to the radiator's internal components. Pulleys and drive belts may also be forced to rub aggressively against other engine parts, which rapidly wears them down. This can lead to other engine problems such as timing errors and malfunctioning sensors.
Exhaust Leaks and Joint Damage
Excessive engine rocking can cause engine pipe connections at the manifold or tail pipe openings to loosen, resulting in exhaust leaks. Seals can also become weakened or torn, along with CV joints at both halfshafts. If the particular mount damaged is an end mount it can create a phenomenon known as "torque steer," which specifically damages the vehicle's CV joints, causing rapid deterioration. If a vehicle's CV joints are extensively damaged a driver will notice a clicking sound emanating from the wheel wells during close turns.
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