Here's a general procedure. Specifics may vary slightly depending on the exact type of motor mount you have (there were a few variations used). Consult a repair manual specific to your 1991 Mustang 302 for detailed diagrams and torque specifications.
Tools you'll likely need:
* Jack and jack stands
* Socket wrench set (metric)
* Wrenches (metric)
* Pry bar (possibly)
* Hammer (possibly, use carefully)
* Penetrating oil (like PB Blaster)
Procedure:
1. Support the Engine: Use a jack to support the engine from underneath, positioned securely under the oil pan. This prevents the engine from dropping when you remove the motor mount. Have the jack firmly in place *before* removing any mount bolts.
2. Locate the Motor Mount: The motor mounts are located on either side of the engine block, connecting it to the frame. There will be two bolts attaching each mount to the engine block and typically one or two to the frame.
3. Apply Penetrating Oil: Spray penetrating oil on all the bolts attaching the motor mount to both the engine and the frame. Let it sit for at least 15-20 minutes to help loosen any rusted or seized bolts.
4. Remove the Bolts: Using the appropriate sockets and wrenches, carefully remove the bolts securing the motor mount. You might need a breaker bar for stubborn bolts. Keep track of which bolts came from where as they can be different lengths.
5. Remove the Motor Mount: Once all the bolts are removed, the motor mount should be free. However, it might be stuck due to corrosion or age. If it’s difficult to remove, gently use a pry bar to separate it from the engine or frame, being careful not to damage anything. Work slowly and methodically to avoid breaking the mount.
6. Inspect the Motor Mount: Carefully inspect the old motor mount for any signs of damage, such as cracks, tears, or excessive wear. This will help determine if it needs replacement.
7. Installation (Reverse Procedure): Installation is the reverse of removal. Make sure to use new bolts if the old ones are damaged or you're replacing the mount itself. Torque the bolts to the manufacturer's specified torque values (found in your repair manual).
Important Considerations:
* Repair Manual: A factory service manual for your specific year and model is invaluable. It will provide detailed diagrams, torque specifications, and other crucial information.
* Bolt Size and Type: Take note of the size and type of bolts used. Replace them with identical ones.
* Frame Damage: Inspect the frame mounting points for any damage. If damaged, it might require repair before reinstalling the mount.
* Engine Alignment: Ensure the engine is properly aligned before tightening the motor mount bolts. Misalignment can cause vibrations and damage.
This is a general guide; consult a repair manual for your specific vehicle to ensure you follow the correct procedure and avoid damage. If you are not comfortable performing this task yourself, it is best to take your car to a qualified mechanic.
