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Over the years, motor mounts have evolved from when they were just an item to mount the engine to the frame or unibody.
A single thunk noise may be heard during the first few accelerations of the day from this type of mount, and is considered normal operation.
Andrew Markel discusses the relationship between motor mounts and U-joints, and how position changes in the engine can affect U-joints and CV axles. Sponsored by Auto Value and Bumper to Bumper.
Jason Stahl discusses active motor mounts, specifically Honda’s ACM system, and how it communicates with the BCM. Sponsored by Intermotor.
Engines have noticeably changed in the past decade. Fewer cylinders, more power at lower RPM and more detectable vibration at idle are just a few of the differences in today’s engines. With these changes, it should be no surprise that engine and transmission mounts have taken on new importance. New technologies are being used that access information from the engine to anticipate vibration before it reaches the driver.
Because they are so critical to the vehicle’s handling and performance, hydraulic engine mounts should be carefully inspected to make sure they are working properly.
Motor mounts serve an important function: They support the weight of the engine and transaxle (or transmission), and also isolate engine vibration from the rest of the chassis. With so much emphasis on controlling noise, vibration and harshness in late model luxury vehicles, it was inevitable that sooner or later motor mounts would go electronic.
Most motor mounts are relatively simple in design and consist only of metal attachment plates and large rubber insulator blocks. But, some vehicles have “hydraulic” or “hydro-mounts” with hollow chambers filled with glycol or hydraulic fluid.
Most motor mounts are relatively simple in design and consist only of metal attachment plates and large rubber insulator blocks. But some vehicles have “hydraulic” or “hydro-mounts” with hollow chambers filled with glycol or hydraulic fluid.
All new numbers are now available and account for more than 84 million vehicle applications, which represents approximately 9 percent of the total U.S. vehicle registration.
I know the majority of you auto techs are extremely proficient at finding and repairing sources of strange and unusual noises. Although chasing these audible emissions can be time consuming and without a doubt aggravating, the customer’s concerns are usually valid and can often be of monumental importance to them.