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With car in drive/reverse and foot hard on brake if the engine moves when gas pedal is depressed and quickly releasedin both D&R, then that mount/mounts is defective...
Engine mount should be replaced if:
1) The hard rubber surface is covered with heat check cracks.
2) The rubber is separated from the metal plate of the engine mount.
3) The rubber is split through the center of the engine mount
The transmission case will crack or break if either engine mounts or transmission rear mount is broken...Here is a GM Service bulletin addressing the issue:
#02-07-30-024B
The transmission mount (see drawing) test:
>Raise and support the vehicle
>Raise the transmission/transaxle in order to remove the weight from the transmission/transaxle mount and create slight tension in the rubber.
Replace trans. mount if anyone of the three conditions listed above exist...saailer
This usually happens when the motor mount near the firewall goes bad, this will allow the motor to move more causing the dog bone to crack, both of these mounts should be replaced.
I have two vehicles that are 1993. When they get that old, rubber starts to dry rot. I have had the same problem on my 1993 Dodge Intrepid. My problem lies in the motor mounts and the transmission mounts. After replacing these items, it runs like a champ.
You can visually determine if you motor mounts are dry rotted. Look under the hood and, with a flashlight, look on either side of the motor. There should be a crossmember running parallel to the axles. On this crossmember will be two (one on either side) large rubber pieces sitting inside a metal holder. These are your motor mounts. If they are cracked and split, they need replacing. Also, if you can run your fingers across one and your fingers turn black, it is not oil... it's rubber powder.
Conclusion: If your motor mounts are dry and cracked, then so are your transmission mounts. You'll want to have them replaced by a professional. If installed by a novice or my a "Mom & Pop" garage, your new mounts may split under stress caused by improper installation... a headache you do not want.
Most motor mounts are basically a piece of rubber attached to a piece of metal. Rubber just dries out after time and begins to crack off. Accelerating hard can speed up this process.
that is a common problem with the ford focus i have a 2001 and if your overflow bottle has the smallest of cracks in it then it will leak onto the mount and then to the tensioner. I would start with the overflow bottle e-mail me if you need more help
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