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The Danger in Broken Engine Mounts

by A.J. Andrews

Engine mounts dampen operating vibrations and brace the motor during vehicle movement. Several types are available, such as standard or glycol-based hydraulic mounts, but they perform the same function and cause the same problems if in poor condition.

Symptoms

Degraded, damaged or malfunctioning motor mounts produce many pronounced indications during operation, or sometimes, in their appearance. Symptoms include engine shift between the fore and aft positions while accelerating or decelerating, leaks in exhaust components and a visually discernible misalignment of the motor.

Effects

In addition to engine damage and the rare, yet plausible, possibility that the motor could fall through the bottom of the vehicle, poor mounts cause constant velocity (CV) joint separation and wear, head exhaust pipe failure and torque steer conditions, which is evidenced by a pulling to the right or left upon acceleration. Other problems include friction build-up attributed to unnecessary contact between belts and pulleys with other components, and, in front wheel drive automobiles, throttle linkage separation and breakage due to stress.

Other Information

In addition to aural and physical signs detected during operation, a thorough visual inspection of the mounts can indicate the presence of a problem. Missing or worn bolts, or a pitch in the engine's alignment, often signifies the mounts need replaced. Although engine mount inspection and replacement is not a routine procedure performed during oil changes or maintenance, they should be changed whenever a motor is hoisted from a vehicle for overhaul or repair purposes.

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