Safety First:
* Disconnect the negative battery terminal before starting any work.
* Support the engine securely with a jack and jack stands. The engine should never be solely supported by the mounts themselves. A transmission jack is highly recommended.
* Use jack stands rated for the weight of your engine and truck.
* Wear safety glasses and gloves.
Tools and Materials:
* Jack and jack stands: Essential for safely supporting the engine.
* Engine support bar: Highly recommended to help stabilize and control engine movement.
* Torque wrench: Crucial for tightening bolts to the manufacturer's specifications.
* Sockets and wrenches (metric): A complete set is needed for various bolts and nuts.
* Pry bar: Helpful for breaking loose stubborn bolts and separating the mounts from the engine/frame.
* Hammer: May be needed to gently tap things loose.
* New motor mounts: Get the correct replacements specific to your truck's year and engine.
* Penetrating oil (PB Blaster, etc.): Spray this on any stubborn bolts before attempting to remove them.
* Clean rags or shop towels: For cleanup.
* Shop manual: A service manual for your specific year and model is invaluable. It will provide detailed instructions, torque specifications, and diagrams.
Procedure (General Steps - Consult your shop manual for precise details):
1. Preparation: Locate the motor mounts. On the 4.9L in an '86 F-150, you'll typically have three: two on the sides of the engine and one in the front (or possibly a center mount depending on configuration). Consult your shop manual. Apply penetrating oil to all bolts.
2. Access: You'll likely need to remove some components for better access to the mounts. This might include things like the air cleaner assembly, various brackets, and possibly parts of the exhaust system. Your shop manual will detail this.
3. Support the Engine: Securely support the engine with a jack and jack stands placed under the oil pan or a suitable engine support bar. *Never work under a vehicle supported only by a jack.*
4. Remove the Old Mounts: Carefully remove the bolts attaching the old motor mounts to the engine and the frame. Use the appropriate sockets and wrenches. A pry bar might be necessary to separate the mounts. Note the orientation of the mounts before removal for proper reinstallation.
5. Install the New Mounts: Position the new motor mounts correctly. Carefully align the holes and install the bolts. Tighten them hand-tight first, then use a torque wrench to tighten them to the manufacturer's specifications (found in your shop manual).
6. Lower the Engine (Slowly and Carefully): Once the new mounts are installed, carefully lower the engine onto the new mounts. Ensure the engine sits properly.
7. Reinstall Components: Reinstall all components that were removed earlier.
8. Check for Leaks and Proper Function: Once everything is reassembled, start the engine and let it run for a while, checking for any leaks or unusual noises. Carefully inspect the mounts for proper function and security.
Important Notes:
* Torque Specifications: Following the proper torque specifications is critical to prevent damage. Use a torque wrench and consult your shop manual.
* Shop Manual: This is your best resource. It will provide detailed instructions specific to your vehicle. Without it, you risk damaging your truck.
* Professional Help: If you're not comfortable with this level of automotive repair, it's best to seek professional assistance.
This is a general guide. The specific procedures and components you'll encounter may vary slightly. Always consult a repair manual specific to your 1986 Ford F-150 4.9L engine before beginning this repair. Improper installation can lead to serious engine damage and safety hazards.
